Journal articles: 'Twistronics'

1

Hu, Guangwei, Cheng-Wei Qiu, and Andrea Alù. "Twistronics for photons: opinion." Optical Materials Express 11, no. 5 (April 8, 2021): 1377. http://dx.doi.org/10.1364/ome.423521.

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Armghan, Ammar, Meshari Alsharari, Khaled Aliqab, Osamah Alsalman, Juveriya Parmar, and Shobhit K. Patel. "Graphene Twistronics: Tuning the Absorption Spectrum and Achieving Metamaterial Properties." Mathematics 11, no. 7 (March 24, 2023): 1579. http://dx.doi.org/10.3390/math11071579.

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Graphene twistronics using multilayer graphene is presented in such a way that it provides a metamaterial effect. This manuscript also analyzes the prediction of behavior using machine learning. The metamaterial effect is achieved by twisting the graphene layers. Graphene twistronics is a new concept for changing the electrical and optical properties of bilayer graphene by applying a small angle twist between the layers. The angle twists of 5°, 10°, and 15° are analyzed for the proposed graphene twistronics design. Tuning in the absorption spectrum is achieved by applying small twists to the angles of the bilayer graphene. Results in the form of absorption, conductivity, permeability, permittivity, and impedance are presented for different twist angles. The twisted graphene layers also demonstrate negative permittivity and negative permeability, similar to metamaterials. These negative refraction properties of graphene twistronics provide flexibility and transparency, which can be applied in photovoltaic applications. Machine-learning-based regression models are used to reduce the simulation time and resources. The results show that a regression model can reliably estimate intermediate wavelength absorption values with an R2 of 0.9999.

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Gardezi, S. Minhal, Harris Pirie, Stephen Carr, William Dorrell, and Jennifer E. Hoffman. "Simulating twistronics in acoustic metamaterials." 2D Materials 8, no. 3 (April 13, 2021): 031002. http://dx.doi.org/10.1088/2053-1583/abf252.

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Wu, Di, Yi Pan, and Tai Min. "Twistronics in Graphene, from Transfer Assembly to Epitaxy." Applied Sciences 10, no. 14 (July 8, 2020): 4690. http://dx.doi.org/10.3390/app10144690.

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The twistronics, which is arising from the moiré superlattice of the small angle between twisted bilayers of 2D materials like graphene, has attracted much attention in the field of 2D materials and condensed matter physics. The novel physical properties in such systems, like unconventional superconductivity, come from the dispersionless flat band that appears when the twist reaches some magic angles. By tuning the filling of the fourfold degeneracy flat bands, the desired effects are induced due to the strong correlation of the degenerated Bloch electrons. In this article, we review the twistronics in twisted bi- and multi-layer graphene (TBG and TMG), which is formed both by transfer assembly of exfoliated monolayer graphene and epitaxial growth of multilayer graphene on SiC substrates. Starting from a brief history, we then introduce the theory of flat band in TBG. In the following, we focus on the major achievements in this field: (a) van Hove singularities and charge order; (b) superconductivity and Mott insulator in TBG and (c) transport properties in TBG. In the end, we give the perspective of the rising materials system of twistronics, epitaxial multilayer graphene on the SiC.

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Veerpal and Ajay. "Exotic Electronic Properties of Twisted Bilayer Graphene-Emergence of Twistronics." Journal of Physics: Conference Series 2518, no. 1 (June 1, 2023): 012013. http://dx.doi.org/10.1088/1742-6596/2518/1/012013.

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Abstract In Twistronics we study the effect of relative twist between the layers of a material on the electronic properties of that layered materials. There are expected to be hundreds of layered materials which can give rise to thousands or even more layered materials with combination of layers and relative twist between the layers. There is a great possibility to encounter many exotic electronic properties in these rather less explored layered materials with relative twist between the layers. There is a lot to explore and understand, to unlock full potential of twistronics. A lot of theoretical and experimental studies have been done and are being done to explore the electronic properties of twisted bilayer graphene, making it a good material to start with to explore the hidden potential of twistronics. Here we present a simple theoretical model study for commensurate twisted bilayer graphene. Starting from understanding of moire pattern in twisted bilayer graphene our study goes through writing of tight binding Hamiltonian, computational codes to determine various model parameters, solution of Hamiltonian to obtain quasi particle energies and density of states near Fermi energy in twisted bilayer graphene. Our theoretical calculations have produced flat band near Dirac point and Van-Hove singularities near Fermi energy, which agree qualitatively with recent experimental studies.

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Liu, Mengya, Liping Wang, and Gui Yu. "Developing Graphene‐Based Moiré Heterostructures for Twistronics." Advanced Science 9, no. 1 (November 2021): 2103170. http://dx.doi.org/10.1002/advs.202103170.

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7

Donaldson, Laurie. "Twistronics breakthrough on manipulation of 2D materials." Materials Today 44 (April 2021): 3–4. http://dx.doi.org/10.1016/j.mattod.2021.01.021.

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Kang, Peng, Wanting Zhang, Vincent Michaud-Rioux, Xin Wang, Jiangni Yun, and Hong Guo. "Twistronics in tensile strained bilayer black phosphorus." Nanoscale 12, no. 24 (2020): 12909–16. http://dx.doi.org/10.1039/d0nr02179b.

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Hennighausen, Zachariah, and Swastik Kar. "Twistronics: a turning point in 2D quantum materials." Electronic Structure 3, no. 1 (March 1, 2021): 014004. http://dx.doi.org/10.1088/2516-1075/abd957.

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Ren, Ya-Ning, Yu Zhang, Yi-Wen Liu, and Lin He. "Twistronics in graphene-based van der Waals structures." Chinese Physics B 29, no. 11 (October 2020): 117303. http://dx.doi.org/10.1088/1674-1056/abbbe2.

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Craig, Steven R., Zhenglu Li, Jiawei Ruan, Steven G. Louie, and Chengzhi Shi. "Acoustic analog of twisted bilayer graphene." Journal of the Acoustical Society of America 151, no. 4 (April 2022): A130. http://dx.doi.org/10.1121/10.0010876.

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The emergence of twistronics in bilayer graphene has inspired the creation of new phononic structures that translate quantum effects into macro systems. Here, we introduce an acoustic analog of twisted bilayer graphene that is built with 3D-printed star arrays confined in a two-dimensional acoustic waveguide. The lattices on the top and bottom of the waveguide are coupled by spoof surface acoustic waves. Like its quantum counterpart, the twisting angle of the structure influences wave propagation within the system and its resulting band structures. In analytical models, full-wave simulations, and experiments, we observe mode localization at magic twisting angle that hosts the flat bands. We also study other twisted bilayers with different twisting angles to compare with the magic-angle results. The observation of unusual twistronics effects in acoustic systems demonstrates the potential to identify new quantum materials with simplified acoustic models.

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12

Yang, Yaping, Jidong Li, Jun Yin, Shuigang Xu, Ciaran Mullan, Takashi Taniguchi, Kenji Watanabe, Andre K. Geim, Konstantin S. Novoselov, and Artem Mishchenko. "In situ manipulation of van der Waals heterostructures for twistronics." Science Advances 6, no. 49 (December 2020): eabd3655. http://dx.doi.org/10.1126/sciadv.abd3655.

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In van der Waals heterostructures, electronic bands of two-dimensional (2D) materials, their nontrivial topology, and electron-electron interactions can be markedly changed by a moiré pattern induced by twist angles between different layers. This process is referred to as twistronics, where the tuning of twist angle can be realized through mechanical manipulation of 2D materials. Here, we demonstrate an experimental technique that can achieve in situ dynamical rotation and manipulation of 2D materials in van der Waals heterostructures. Using this technique, we fabricated heterostructures where graphene is perfectly aligned with both top and bottom encapsulating layers of hexagonal boron nitride. Our technique enables twisted 2D material systems in one single stack with dynamically tunable optical, mechanical, and electronic properties.

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13

Kang, Peng. "Indirect-to-direct bandgap transition in bilayer InSe: roles of twistronics." 2D Materials 7, no. 2 (January 27, 2020): 021002. http://dx.doi.org/10.1088/2053-1583/ab6707.

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Rakib, Tawfiqur, Pascal Pochet, Elif Ertekin, and Harley T. Johnson. "Moiré engineering in van der Waals heterostructures." Journal of Applied Physics 132, no. 12 (September 28, 2022): 120901. http://dx.doi.org/10.1063/5.0105405.

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Isolated atomic planes can be assembled into a multilayer van der Waals (vdW) heterostructure in a precisely chosen sequence. These heterostructures feature moiré patterns if the constituent 2D material layers are stacked in an incommensurable way, due to a lattice mismatch or twist. This design-by-stacking has opened up the promising area of moiré engineering, a term that can be understood in two different perspectives, namely, (i) structural—engineering a moiré pattern by introducing twist, relative strain, or defects that affect the commensurability of the layers and (ii) functional—exploiting a moiré pattern to find and tune resulting physical properties of a vdW heterostructure. The latter meaning, referring to the application of a moiré pattern, is seen in the literature in the specific context of the observation of correlated electronic states and unconventional superconductivity in twisted bilayer graphene. The former meaning, referring to the design of the moiré pattern itself, is present in the literature but less commonly discussed or less understood. The underlying link between these two perspectives lies in the deformation field of the moiré superlattice. In this Perspective, we describe a path from designing a moiré pattern to employing the moiré pattern to tune physical properties of a vdW heterostructure. We also discuss the concept of moiré engineering in the context of twistronics, strain engineering, and defect engineering in vdW heterostructures. Although twistronics is always associated with moiré superlattices, strain and defect engineering are often not. Here, we demonstrate how strain and defect engineering can be understood within the context of moiré engineering. Adopting this perspective, we note that moiré engineering creates a compelling opportunity to design and develop multiscale electronic devices.

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15

Varma Sangani, L. D., R. S. Surya Kanthi, Pratap Chandra Adak, Subhajit Sinha, Alisha H. Marchawala, Takashi Taniguchi, Kenji Watanabe, and Mandar M. Deshmukh. "Facile deterministic cutting of 2D materials for twistronics using a tapered fibre scalpel." Nanotechnology 31, no. 32 (May 28, 2020): 32LT02. http://dx.doi.org/10.1088/1361-6528/ab8b93.

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16

Brzhezinskaya, Maria, Oleg Kononenko, Victor Matveev, Aleksandr Zotov, Igor I. Khodos, Vladimir Levashov, Vladimir Volkov, Sergey I. Bozhko, Sergey V. Chekmazov, and Dmitry Roshchupkin. "Engineering of Numerous Moiré Superlattices in Twisted Multilayer Graphene for Twistronics and Straintronics Applications." ACS Nano 15, no. 7 (July 13, 2021): 12358–66. http://dx.doi.org/10.1021/acsnano.1c04286.

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17

Yves, Simon, Yu-Gui Peng, and Andrea Alù. "Topological Lifshitz transition in twisted hyperbolic acoustic metasurfaces." Applied Physics Letters 121, no. 12 (September 19, 2022): 122201. http://dx.doi.org/10.1063/5.0107465.

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Acoustic metamaterials and metasurfaces have been explored in the past few years to realize a wide range of extreme responses for sound waves. As one remarkable phenomenon, extreme anisotropy and hyperbolic sound propagation are particularly challenging to realize compared to electromagnetic waves because of the scalar nature of airborne acoustics. In parallel, moiré superlattices and the rapidly expanding domain of twistronics have shown that large anisotropy combined with tailored geometrical rotations can enable tantalizing emerging phenomena, such as tailored phase transitions in metamaterials. Connecting these areas of research, here, we explore the realization of acoustic hyperbolic metasurfaces and their combination to drive topological phase transitions from hyperbolic to elliptic sound propagation. The transition point occurring at a specific rotation angle between two acoustic metasurfaces supports highly directional canalization of sound, opening exciting opportunities for twisted acoustics metasurfaces for robust surface wave guiding and steering.

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Araujo, Ravel de Moraes Telles, Juliana Zarpellon, and Dante Homero Mosca. "Unveiling ferromagnetism and antiferromagnetism in two dimensions at room temperature." Journal of Physics D: Applied Physics 55, no. 28 (April 14, 2022): 283003. http://dx.doi.org/10.1088/1361-6463/ac60cd.

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Abstract The aim of this work is to present an overview and a critical discussion on two-dimensional materials and functional nanostructures exhibiting ferromagnetic and antiferromagnetic long-range ordering at or above room temperature (RT). We specially describe and discuss the series of results concerning two-dimensional magnetism originated from intrinsic and induced d magnetic moments in low-dimensional nanostructured materials. Selected materials showing two-dimensional magnetic properties close to RT are classified as atomic monolayers, natural and artificial van der Waals layers, magneto-lamellar intermetallic compounds, and nanostructured materials containing native and artificially created defects that originate magnetic moments in networks with two-dimensional interconnectivity. To make the point on these materials, we describe their atomic and electronic structures as well as magnetic interaction mechanisms responsible for magnetic behavior. Theoretical backgrounds for understanding the correlations between structure and magnetic properties are examined. Special emphasis on the possible applications of two-dimensional magnetism for developments of new devices in the fields of spintronics, spin-orbitronics, magnonics, valleytronics and twistronics, among other emergent technologies are discussed.

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Gangemi, Nicholas, Caleb F. Sieck, Joseph Vignola, Diego Turo, Alec K. Ikei, Amelia Vignola, Jeffrey Baldwin, et al. "Frequency-dependent surface wave suppression at the Dirac point of an acoustic graphene analog." Journal of the Acoustical Society of America 153, no. 3_supplement (March 1, 2023): A362. http://dx.doi.org/10.1121/10.0019168.

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The dispersion of bound acoustic surface waves over hexagonal lattices of resonant cavities has been shown to be analogous to the dispersion of charge transport in carbon graphene. Of particular interest is the frequency range close to the acoustic Dirac point where novel physics is predicted to occur. In this study, we measure the dispersion curves of a single-layer acoustic graphene analogue with high resolution one-dimensional spatial scansand show how the curves can be suppressed (near and at the Dirac point) by strong variations in the impedance boundary conditions between the free field and surface wave regimes under certain experimental conditions. By systematically varying these impedance boundary conditions using different surface wave excitation techniques, we demonstrate that increased Rayleigh scattering and diffractive excitation can increase the dispersed surface wave pressure amplitude to an extent that the impedance-based wave suppression is circumvented. The improved conditions for observing acoustic Dirac points for two samples with two distinct operational frequency ranges are reported. The single-layer acoustic graphene analogue results discussed here are important for advancing the field of acoustic twistronics.

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20

Chen, Yaoyao, Liwei Liu, Xuan Song, Han Yang, Zeping Huang, Teng Zhang, Huixia Yang, Hong-Jun Gao, and Yeliang Wang. "Twisted charge-density-wave patterns in bilayer 2D crystals and modulated electronic states." 2D Materials 9, no. 1 (December 29, 2021): 014007. http://dx.doi.org/10.1088/2053-1583/ac427f.

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Abstract The twistronics of the atomic-thick two-dimensional (2D) van der Waals materials has opened a new venue to investigate the interlayer coupling. Till now, most studies focus on the twist of atomic lattices and the resulted moiré superstructures, while the reports about the twist of charge density waves (CDWs), the superstructures of which are from individual layers are limited. Here, using molecular beam epitaxy, we construct bilayer (BL) 1T-NbSe2 vertical structures. With high resolution scanning tunneling microscopy observations, we identify two cases of CDW twisted stacking with atomic precision. The typical twist angles are 0° and 60° between the 1st and the 2nd layer, although the top Se atomic lattices of these two layers are parallel. Compared to the single layer case, the dI/dV at BL shows an insulator-to-metal transition, with the Hubbard bands shrinking towards the Fermi level (E F). More intriguingly, interlayer coupling states rise near E F, which are related to the CDW twist angles. These findings give fresh insight into the engineering of 2D materials by CDW twisting and are potentially applicable for future nanoelectronic devices.

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21

Xin, Kaiyao, Xingang Wang, Kasper Grove-Rasmussen, and Zhongming Wei. "Twist-angle two-dimensional superlattices and their application in (opto)electronics." Journal of Semiconductors 43, no. 1 (January 1, 2022): 011001. http://dx.doi.org/10.1088/1674-4926/43/1/011001.

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Abstract Twist-angle two-dimensional systems, such as twisted bilayer graphene, twisted bilayer transition metal dichalcogenides, twisted bilayer phosphorene and their multilayer van der Waals heterostructures, exhibit novel and tunable properties due to the formation of Moiré superlattice and modulated Moiré bands. The review presents a brief venation on the development of “twistronics” and subsequent applications based on band engineering by twisting. Theoretical predictions followed by experimental realization of magic-angle bilayer graphene ignited the flame of investigation on the new freedom degree, twist-angle, to adjust (opto)electrical behaviors. Then, the merging of Dirac cones and the presence of flat bands gave rise to enhanced light-matter interaction and gate-dependent electrical phases, respectively, leading to applications in photodetectors and superconductor electronic devices. At the same time, the increasing amount of theoretical simulation on extended twisted 2D materials like TMDs and BPs called for further experimental verification. Finally, recently discovered properties in twisted bilayer h-BN evidenced h-BN could be an ideal candidate for dielectric and ferroelectric devices. Hence, both the predictions and confirmed properties imply twist-angle two-dimensional superlattice is a group of promising candidates for next-generation (opto)electronics.

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Arturo Sánchez-Sánchez, Jesús, Montserrat Navarro-Espino, Yonatan Betancur-Ocampo, José Eduardo Barrios-Vargas, and Thomas Stegmann. "Steering the current flow in twisted bilayer graphene." Journal of Physics: Materials 5, no. 2 (February 11, 2022): 024003. http://dx.doi.org/10.1088/2515-7639/ac4ae0.

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Abstract A nanoelectronic device made of twisted bilayer graphene (TBLG) is proposed to steer the direction of the current flow. The ballistic electron current, injected at one edge of the bottom layer, can be guided predominantly to one of the lateral edges of the top layer. The current is steered to the opposite lateral edge, if either the twist angle is reversed or the electrons are injected in the valence band instead of the conduction band, making it possible to control the current flow by electric gates. When both graphene layers are aligned, the current passes straight through the system without changing its initial direction. The observed steering angle exceeds well the twist angle and emerges for a broad range of experimentally accessible parameters. It is explained by the twist angle and the trigonal shape of the energy bands beyond the van Hove singularity due to the Moiré interference pattern. As the shape of the energy bands depends on the valley degree of freedom, the steered current is partially valley polarized. Our findings show how to control and manipulate the current flow in TBLG. Technologically, they are of relevance for applications in twistronics and valleytronics.

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23

Zhou, Kun, Liya Wang, Ruijie Wang, Chengyuan Wang, and Chun Tang. "One Dimensional Twisted Van der Waals Structures Constructed by Self-Assembling Graphene Nanoribbons on Carbon Nanotubes." Materials 15, no. 22 (November 18, 2022): 8220. http://dx.doi.org/10.3390/ma15228220.

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Twisted van der Waals heterostructures were recently found to possess unique physical properties, such as superconductivity in magic angle bilayer graphene. Owing to the nonhomogeneous stacking, the energy of twisted van der Waals heterostructures are often higher than their AA or AB stacking counterpart, therefore, fabricating such structures remains a great challenge in experiments. On the other hand, one dimensional (1D) coaxial van der Waals structures has less freedom to undergo phase transition, thus offer opportunity for fabricating the 1D cousin of twisted bilayer graphene. In this work, we show by molecular dynamic simulations that graphene nanoribbons can self-assemble onto the surface of carbon nanotubes driven by van der Waals interactions. By modifying the size of the carbon nanotubes or graphene nanoribbons, the resultant configurations can be controlled. Of particular interest is the formation of twisted double walled carbon nanotubes whose chiral angle difference can be tuned, including the 1.1° magic angle. Upon the longitudinal unzipping of such structures, twisted bilayer graphene nanoribbons can be obtained. As the longitudinal unzipping of carbon nanotubes is a mature technique, we expect the strategy proposed in this study to stimulate experimental efforts and promote the fast growing research in twistronics.

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Shoaib, Hassan, Qing Peng, and Abduljabar Q. Alsayoud. "Atomic Insights into Fracture Characteristics of Twisted Tri-Layer Graphene." Crystals 11, no. 10 (October 6, 2021): 1202. http://dx.doi.org/10.3390/cryst11101202.

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Graphene twistronics have recently gained significant attention due their superconductive behavior as a consequence of their tunable electronic properties. Although the electronic properties of twisted graphene have been extensively studied, the mechanical properties and integrity of twisted trilayer graphene (tTLG) under loading is still elusive. We investigated the fracture mechanics of tTLG with a twist angle of ±1.53° utilizing molecular dynamics simulation. This twist angle was chosen because it is known to exhibit highly superconductive behavior. The results indicate that tTLG does not preserve the excellent mechanical properties typically associated with graphene, with toughness and fracture strain values much lower in comparison. The Young’s modulus was an exception with values relatively close to pristine graphene, whereas the tensile strength was found to be roughly half of the intrinsic strength of graphene. The fracture toughness, fracture strain and strength converge as the crack length increases, reaching 0.26 J/m3, 0.0217 and 39.9 GPa at a crack length of 8 nm, respectively. The Griffth critical strain energy is 19.98 J/m2 and the critical stress intensity factor Kc is 4.47 MPa M1/2, in good agreement with that of monolayer graphene in the experiment. Our atomic insights might be helpful in the material design of twisted trilayer graphene-based electronics.

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Enaldiev, V. V., F. Ferreira, S. J. Magorrian, and Vladimir I. Fal’ko. "Piezoelectric networks and ferroelectric domains in twistronic superlattices in WS2/MoS2 and WSe2/MoSe2 bilayers." 2D Materials 8, no. 2 (February 25, 2021): 025030. http://dx.doi.org/10.1088/2053-1583/abdd92.

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Lei, Shiming, Jingjing Lin, Yanyu Jia, Mason Gray, Andreas Topp, Gelareh Farahi, Sebastian Klemenz, et al. "High mobility in a van der Waals layered antiferromagnetic metal." Science Advances 6, no. 6 (February 2020): eaay6407. http://dx.doi.org/10.1126/sciadv.aay6407.

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Van der Waals (vdW) materials with magnetic order have been heavily pursued for fundamental physics as well as for device design. Despite the rapid advances, so far, they are mainly insulating or semiconducting, and none of them has a high electronic mobility—a property that is rare in layered vdW materials in general. The realization of a high-mobility vdW material that also exhibits magnetic order would open the possibility for novel magnetic twistronic or spintronic devices. Here, we report very high carrier mobility in the layered vdW antiferromagnet GdTe3. The electron mobility is beyond 60,000 cm2 V−1 s−1, which is the highest among all known layered magnetic materials, to the best of our knowledge. Among all known vdW materials, the mobility of bulk GdTe3 is comparable to that of black phosphorus. By mechanical exfoliation, we further demonstrate that GdTe3 can be exfoliated to ultrathin flakes of three monolayers.

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McDonnell, Liam P., Jacob J. S. Viner, David A. Ruiz-Tijerina, Pasqual Rivera, Xiaodong Xu, Vladimir I. Fal’ko, and David C. Smith. "Superposition of intra- and inter-layer excitons in twistronic MoSe2/WSe2 bilayers probed by resonant Raman scattering." 2D Materials 8, no. 3 (March 25, 2021): 035009. http://dx.doi.org/10.1088/2053-1583/abe778.

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Enaldiev, Vladimir V., Fabio Ferreira, and Vladimir I. Fal’ko. "A Scalable Network Model for Electrically Tunable Ferroelectric Domain Structure in Twistronic Bilayers of Two-Dimensional Semiconductors." Nano Letters 22, no. 4 (February 7, 2022): 1534–40. http://dx.doi.org/10.1021/acs.nanolett.1c04210.

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Ren, Lingling, and Baojuan Dong. "Ferroelectric Polarization in an h-BN-Encapsulated 30°-Twisted Bilayer–Graphene Heterostructure." Magnetochemistry 9, no. 5 (April 26, 2023): 116. http://dx.doi.org/10.3390/magnetochemistry9050116.

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Recently, the emergent two-dimensional (2D) ferroelectric materials have provided new possibilities for the miniaturization of ferroelectric systems and the integration of novel 2D nano-electronic devices. In addition to the intrinsic ferroelectrics exfoliated from bulk, 2D heterostructures hybridized from electrically non-polarized van der Waals (vdW) materials have also been proven to be a promising platform for the construction of ferroelectricity. Here, we report 30° twisted bilayer–graphene (TBLG) incommensurate moiré superlattice encapsulated by hexagonal boron nitride (h-BN), in which robust hysteretic resistance was detected at the top interface between h-BN and the TBLG from room temperature down to 40 mK. The hysteretic phenomenon can be understood by the extra carrier induced by the interfacial 2D ferroelectric polarization, which is estimated to be around 0.7 pC/m. Our work of interfacial ferroelectric heterostructure achieved by a TBLG/h-BN hybrid system expands the 2D ferroelectric families and opens more possibilities for future coupling the ferroelectricity with rich electronic and optical properties in vdW twistronic devices.

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Nikitin, Alexey Y. "Photothermal twistronics." Nature Nanotechnology, March 29, 2021. http://dx.doi.org/10.1038/s41565-021-00890-8.

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Mizobata, William, José Sanches, Mathaus Penha, Willian Carvalho Silva, Carlos Alberto Batista Carvalho, Marcos Figueira, Mariano de Souza, and Antonio C. Seridonio. "Atomic frustration-based twistronics." 2D Materials, September 16, 2021. http://dx.doi.org/10.1088/2053-1583/ac277f.

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Wu, Fengcheng, Rui-Xing Zhang, and Sankar Das Sarma. "Three-dimensional topological twistronics." Physical Review Research 2, no. 2 (April 13, 2020). http://dx.doi.org/10.1103/physrevresearch.2.022010.

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Yu, Yun, Madeline Van Winkle, and D. Kwabena Bediako. "Tuning interfacial chemistry with twistronics." Trends in Chemistry, August 2022. http://dx.doi.org/10.1016/j.trechm.2022.07.003.

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Salamon, Tymoteusz, Alessio Celi, Ravindra W. Chhajlany, Irénée Frérot, Maciej Lewenstein, Leticia Tarruell, and Debraj Rakshit. "Simulating Twistronics without a Twist." Physical Review Letters 125, no. 3 (July 14, 2020). http://dx.doi.org/10.1103/physrevlett.125.030504.

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Mullan, Ciaran, Sergey Slizovskiy, Jun Yin, Ziwei Wang, Qian Yang, Shuigang Xu, Yaping Yang, et al. "Mixing of moiré-surface and bulk states in graphite." Nature, July 19, 2023. http://dx.doi.org/10.1038/s41586-023-06264-5.

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AbstractVan der Waals assembly enables the design of electronic states in two-dimensional (2D) materials, often by superimposing a long-wavelength periodic potential on a crystal lattice using moiré superlattices1–9. This twistronics approach has resulted in numerous previously undescribed physics, including strong correlations and superconductivity in twisted bilayer graphene10–12, resonant excitons, charge ordering and Wigner crystallization in transition-metal chalcogenide moiré structures13–18 and Hofstadter’s butterfly spectra and Brown–Zak quantum oscillations in graphene superlattices19–22. Moreover, twistronics has been used to modify near-surface states at the interface between van der Waals crystals23,24. Here we show that electronic states in three-dimensional (3D) crystals such as graphite can be tuned by a superlattice potential occurring at the interface with another crystal—namely, crystallographically aligned hexagonal boron nitride. This alignment results in several Lifshitz transitions and Brown–Zak oscillations arising from near-surface states, whereas, in high magnetic fields, fractal states of Hofstadter’s butterfly draw deep into the bulk of graphite. Our work shows a way in which 3D spectra can be controlled using the approach of 2D twistronics.

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Angeli, Mattia, Gabriel R. Schleder, and Efthimios Kaxiras. "Twistronics of Janus transition metal dichalcogenide bilayers." Physical Review B 106, no. 23 (December 29, 2022). http://dx.doi.org/10.1103/physrevb.106.235159.

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Song, Jizhe, and Mengtao Sun. "Challenging breaking thermoelectric performance limits by twistronics." Journal of Materials Chemistry A, 2023. http://dx.doi.org/10.1039/d3ta02283h.

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With today's scarce resources, the issue of energy conversion is of great concern. Thermoelectric materials are capable of converting thermal energy into electrical energy. Excellent figure of merit (ZT) requires...

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38

Yuan, Jiahao, Mengzhou Liao, Zhiheng Huang, Jinpeng Tian, Yanbang Chu, Luojun Du, Wei Yang, Dongxia Shi, Rong Yang, and Guangyu Zhang. "Precisely controlling the twist angle of epitaxial MoS₂/graphene heterostructure by AFM tip manipulation." Chinese Physics B, May 23, 2022. http://dx.doi.org/10.1088/1674-1056/ac720e.

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Abstract Two-dimensional (2D) moiré materials have attracted a lot of attention and opened a new research frontier of twistronics due to their novel physical properties. Although great progress has been achieved, the inability to precisely and reproducibly manipulate the twist angle hinders the further development of twistronics. Here, we demonstrated an atomic force microscope (AFM) tip manipulation method to control the interlayer twist angle of epitaxial MoS2/graphene heterostructure with an ultra-high accuracy of below 0.1°. Furthermore, conductive AFM and spectroscopic characterizations were conducted to show the effects of twist angle on moiré pattern wavelength, phonons and excitons. Our work provides a technique to precisely control the twist angle of 2D moiré materials, enabling the possibility to establish the phase diagrams of moiré physics with twist angle.

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Hennighausen, Zachariah, and Swastik Kar. "Twistronics: A turning point in 2D quantum materials." Electronic Structure, January 7, 2021. http://dx.doi.org/10.1088/2516-1075/abd957.

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Liu, Diyi, Mitchell Luskin, and Stephen Carr. "Seeing moiré: Convolutional network learning applied to twistronics." Physical Review Research 4, no. 4 (December 30, 2022). http://dx.doi.org/10.1103/physrevresearch.4.043224.

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Xie, Lingbin, Longlu Wang, Weiwei Zhao, Shujuan Liu, Wei Huang, and Qiang Zhao. "WS2 moiré superlattices derived from mechanical flexibility for hydrogen evolution reaction." Nature Communications 12, no. 1 (August 20, 2021). http://dx.doi.org/10.1038/s41467-021-25381-1.

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AbstractThe discovery of moiré superlattices (MSLs) opened an era in the research of ‘twistronics’. Engineering MSLs and realizing unique emergent properties are key challenges. Herein, we demonstrate an effective synthetic strategy to fabricate MSLs based on mechanical flexibility of WS2 nanobelts by a facile one-step hydrothermal method. Unlike previous MSLs typically created through stacking monolayers together with complicated method, WS2 MSLs reported here could be obtained directly during synthesis of nanobelts driven by the mechanical instability. Emergent properties are found including superior conductivity, special superaerophobicity and superhydrophilicity, and strongly enhanced electro-catalytic activity when we apply ‘twistronics’ to the field of catalytic hydrogen production. Theoretical calculations show that such excellent catalytic performance could be attributed to a closer to thermoneutral hydrogen adsorption free energy value of twisted bilayers active sites. Our findings provide an exciting opportunity to design advanced WS2 catalysts through moiré superlattice engineering based on mechanical flexibility.

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"Twistronics: A Recent Avenue in van der Waals Heterostructures." Proceedings International 2, no. 2 (September 27, 2020): 44. http://dx.doi.org/10.33263/proceedings22.044044.

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Two-dimensional (2D) materials, the thinnest form of materials to ever occur in nature, have the potential to dramatically alter and revolutionize our material world. After the discovery of graphene, the most prominent representative of this class of materials, many other 2D crystals have been identified. Even if individual 2D materials own various interesting and unexpected properties, the stacking of such layers leads to ‘artificial vdW solids’ called van der Waals heterostructures (vdW HSs) that result in the emergence of new states of matter with novel functionalities. The vdW HSs not only depend on the combination of different 2D crystal but also on their rotational alignment opening the avenue for a new field called twistronics. Coupling between the two layers depends on the stacking angle, which can be used as an external degree of freedom to tune their optical and electronic properties. Apart from excitonic ground states, 2D transition metal dichalcogenides (TMDs) and their heterostructures offer an excellent platform to explore fascinating higher-order excitations such as trion, biexciton, interlayer exciton, hybrid exciton, moiré exciton, and so on. The emergence of these higher-order excitations mostly depends on the symmetry, temperature, and the band alignment of the heterobilayer systems.

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Sachin, Saurav, Puja Kumari, Neelam Gupta, Shivani Rani, Subhasmita Kar, and Soumya Jyoti Ray. "Van der Waals twistronics in a MoS2/WS2 heterostructure." Computational Condensed Matter, March 2023, e00797. http://dx.doi.org/10.1016/j.cocom.2023.e00797.

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44

Ciarrocchi, Alberto, Fedele Tagarelli, Ahmet Avsar, and Andras Kis. "Excitonic devices with van der Waals heterostructures: valleytronics meets twistronics." Nature Reviews Materials, January 31, 2022. http://dx.doi.org/10.1038/s41578-021-00408-7.

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Nguyen, Viet-Hung, Xuan-Hoang Trinh, and Jean-Christophe Charlier. "Electronic properties of twisted multilayer graphene." Journal of Physics: Materials, May 3, 2022. http://dx.doi.org/10.1088/2515-7639/ac6c4a.

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Abstract Twisted bilayer graphene displays many fascinating properties that can be tuned by varying the relative angle (also called twist angle) between its monolayers. As a remarkable feature, both the electronic flat bands and the corresponding strong electron localization have been obtained at a specific "magic" angle (~ 1.1°), leading to the observation of several strongly correlated electronic phenomena. Such a discovery has hence inspired the creation of a novel research field called twistronics, i.e., aiming to explore novel physical properties in vertically stacked 2D structures when tuning the twist angle between the related layers. In this paper, a comprehensive and systematic study related to the electronic properties of twisted multilayer graphene (TMG) is presented based on atomistic calculations. The dependence of both the global and the local electronic quantities on the twist angle and on the stacking configuration are analyzed, fully taking into account atomic reconstruction effects. Consequently, the correlation between structural and electronic properties are clarified, thereby highlighting the shared characteristics and differences between various TMG systems as well as providing a comprehensive and essential overview. On the basis of these investigations, possibilities to tune the electronic properties are discussed, allowing for further developments in the field of twistronics.

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Mannaï, Marwa, and Sonia Haddad. "Twistronics versus straintronics in twisted bilayers of graphene and transition metal dichalcogenides." Physical Review B 103, no. 20 (May 18, 2021). http://dx.doi.org/10.1103/physrevb.103.l201112.

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Salamon, Tymoteusz, Ravindra W. Chhajlany, Alexandre Dauphin, Maciej Lewenstein, and Debraj Rakshit. "Quantum anomalous Hall phase in synthetic bilayers via twistronics without a twist." Physical Review B 102, no. 23 (December 14, 2020). http://dx.doi.org/10.1103/physrevb.102.235126.

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Miranda, Hudson, Vitor Monken, João Luiz Campos, Thiago de Lourenço e. Vasconcelos, Cassiano Rabelo, Braulio Soares Archanjo, Clara M. Almeida, et al. "Establishing the excitation field in tip-enhanced Raman spectroscopy to study nanostructures within two-dimensional systems." 2D Materials, October 8, 2022. http://dx.doi.org/10.1088/2053-1583/ac988f.

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Abstract The optical field generated by a nanoplasmonic probe is revealed in tip-enhanced Raman spectroscopy – TERS – experiments. The TERS intensity profile of nano-objects smaller than the probe’s apex has a donut-like shape which resembles the magnitude of the field generated by a point-dipole source, being well described by the Dyadic Green’s function. Having prior knowledge on the excitation field generated by the TERS probe, we measured the width of shear solitons caused by lattice reconstruction in low-angle twisted bilayer graphene, a prominent platform for twistronics, and the extend of defect-induced light emission from graphene edges.

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Alvarado, Miguel, and Alfredo Levy Yeyati. "2D topological matter from a boundary Green's functions perspective: Faddeev-LeVerrier algorithm implementation." SciPost Physics 13, no. 1 (July 25, 2022). http://dx.doi.org/10.21468/scipostphys.13.1.009.

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Since the breakthrough of twistronics a plethora of topological phenomena in correlated systems has appeared. These devices can be typically analyzed in terms of lattice models using Green's function techniques. In this work we introduce a general method to obtain the boundary Green's function of such models taking advantage of the numerical Faddeev-LeVerrier algorithm to circumvent some analytical constraints of previous works. We illustrate our formalism analyzing the edge features of a Chern insulator, the Kitaev square lattice model for a topological superconductor and the Checkerboard lattice hosting topological flat bands. The efficiency and accuracy of the method is demonstrated by comparison to recursive Green's function calculations.

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David, Alessandro, Péter Rakyta, Andor Kormányos, and Guido Burkard. "Induced spin-orbit coupling in twisted graphene–transition metal dichalcogenide heterobilayers: Twistronics meets spintronics." Physical Review B 100, no. 8 (August 8, 2019). http://dx.doi.org/10.1103/physrevb.100.085412.

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Journal articles on the topic 'Twistronics'

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