Готові списки джерел за темами / 2D superconductors

Добірка наукової літератури з теми "2D superconductors"

Автор: Grafiati

Опубліковано: 6 вересня 2023

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Статті в журналах з теми "2D superconductors"

Costa, A. T., and N. M. R. Peres. "Enhancing the hybridization of plasmons in graphene with 2D superconductor collective modes." Journal of Physics: Condensed Matter 34, no. 10 (December 23, 2021): 105304. http://dx.doi.org/10.1088/1361-648x/ac3e1d.

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Abstract We explore ways in which the close proximity between graphene sheets and monolayers of 2D superconductors can lead to hybridization between their collective excitations. We consider heterostructures formed by combinations of graphene sheets and 2D superconductor monolayers. The broad range of energies in which the graphene plasmon can exist, together with its tunability, makes such heterostructures promising platforms for probing the many-body physics of superconductors. We show that the hybridization between the graphene plasmon and the Bardasis–Schrieffer mode of a 2D superconductor results in clear signatures on the near-field reflection coefficient of the heterostructure, which in principle can be observed in scanning near-field microscopy experiments.

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Devarakonda, A., H. Inoue, S. Fang, C. Ozsoy-Keskinbora, T. Suzuki, M. Kriener, L. Fu, E. Kaxiras, D. C. Bell, and J. G. Checkelsky. "Clean 2D superconductivity in a bulk van der Waals superlattice." Science 370, no. 6513 (October 8, 2020): 231–36. http://dx.doi.org/10.1126/science.aaz6643.

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Advances in low-dimensional superconductivity are often realized through improvements in material quality. Apart from a small group of organic materials, there is a near absence of clean-limit two-dimensional (2D) superconductors, which presents an impediment to the pursuit of numerous long-standing predictions for exotic superconductivity with fragile pairing symmetries. We developed a bulk superlattice consisting of the transition metal dichalcogenide (TMD) superconductor 2H-niobium disulfide (2H-NbS2) and a commensurate block layer that yields enhanced two-dimensionality, high electronic quality, and clean-limit inorganic 2D superconductivity. The structure of this material may naturally be extended to generate a distinct family of 2D superconductors, topological insulators, and excitonic systems based on TMDs with improved material properties.

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Lee, Dung-Hai. "Anyon Superconductivity and the Fractional Quantum-Hall Effect." International Journal of Modern Physics B 05, no. 10 (June 1991): 1695–713. http://dx.doi.org/10.1142/s0217979291001607.

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I review the concept of statistics transmutation in two dimensions and apply it to the understanding of Fractional quantum-Hall effect and anyon superconductivity. A contrast of the electromagnetic properties of an ordinary 2D superconductor, a quantum-Hall liquid and an anyon superconductor is presented. The relevance of the anyon model to copper-oxide superconductors is also discussed.

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Morita, M., and S. Okuma. "Flux Pinning and Current-Induced Vortex Motion at T→0 in Two-Dimensional Vortex Glass." International Journal of Modern Physics B 17, no. 18n20 (August 10, 2003): 3445–48. http://dx.doi.org/10.1142/s0217979203021174.

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We investigate the roles of flux pinning on vortex motion at low temperatures (T) in two-dimensional (2D) superconductors using two thin (4 nm) amorphous Mo x Si 1-x films with different pinning strength. We measure the T dependence of resistance R at fields B below the critical field Bc of the 2D superconductor-insulator (SI) transition. For both films we observe the very small T-independent R at T→0 in certain field regions below Bc, suggesting quantum motion of a small number of vortices (dislocations) in the 2D vortex-glass phase in the presence of current. For the film with weaker pinning, the activation energy decreases at T<0.1 K .

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Mason, N., and A. Kapitulnik. "Dissipation Effects on the Superconductor-Insulator Transition in 2D Superconductors." Physical Review Letters 82, no. 26 (June 28, 1999): 5341–44. http://dx.doi.org/10.1103/physrevlett.82.5341.

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CHAN, L. P., K. G. LYNN, and D. R. HARSHMAN. "CAN POSITRON 2D–ACAR RESOLVE THE ELECTRONIC STRUCTURE OF HIGH-Tc SUPERCONDUCTORS?" Modern Physics Letters B 06, no. 11 (May 10, 1992): 617–35. http://dx.doi.org/10.1142/s0217984992000715.

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We examine the ability of the positron Two-Dimensional Angular Correlation Annihilation Radiation (2D-ACAR) technique to resolve the electronic structures of high-T c cuprate superconductors. Following a short description of the technique, discussions of the theoretical assumptions, data analysis and experimental considerations, in relation to the high-T c superconductors, are given. We briefly review recent 2D-ACAR experiments on YBa 2 Cu 3 O 7−x, Bi 2 Sr 2 CaCuO 8+δ and La 2−x Sr x CuO 4. The 2D-ACAR technique is useful in resolving the band crossings associated with the layers of the superconductors that are preferentially sampled by the positrons. Together with other Fermi surface measurements (namely angle-resolved photoemission), 2D-ACAR can resolve some of the electronic structures of high-T c cuprate superconductors. In addition, 2D-ACAR measurements of YBa 2 Cu 3 O 7−x and Bi 2 Sr 2 CaCuO 8+δ also reveal an interesting temperature dependence in the fine structures, and a change in the positron lifetime in the former.

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Qiu, Dong, Chuanhui Gong, SiShuang Wang, Miao Zhang, Chao Yang, Xianfu Wang, and Jie Xiong. "Recent Advances in 2D Superconductors." Advanced Materials 33, no. 18 (March 26, 2021): 2006124. http://dx.doi.org/10.1002/adma.202006124.

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Morandi, Antonio. "2D electromagnetic modelling of superconductors." Superconductor Science and Technology 25, no. 10 (September 12, 2012): 104003. http://dx.doi.org/10.1088/0953-2048/25/10/104003.

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Palacio-Morales, Alexandra, Eric Mascot, Sagen Cocklin, Howon Kim, Stephan Rachel, Dirk K. Morr, and Roland Wiesendanger. "Atomic-scale interface engineering of Majorana edge modes in a 2D magnet-superconductor hybrid system." Science Advances 5, no. 7 (July 2019): eaav6600. http://dx.doi.org/10.1126/sciadv.aav6600.

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Topological superconductors are predicted to harbor exotic boundary states—Majorana zero-energy modes—whose non-Abelian braiding statistics present a new paradigm for the realization of topological quantum computing. Using low-temperature scanning tunneling spectroscopy, here, we report on the direct real-space visualization of chiral Majorana edge states in a monolayer topological superconductor, a prototypical magnet-superconductor hybrid system composed of nanoscale Fe islands of monoatomic height on a Re(0001)-O(2 × 1) surface. In particular, we demonstrate that interface engineering by an atomically thin oxide layer is crucial for driving the hybrid system into a topologically nontrivial state as confirmed by theoretical calculations of the topological invariant, the Chern number.

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BRUSOV, PETER, PAUL BRUSOV, and CHONG LEE. "COLLECTIVE PROPERTIES OF UNCONVENTIONAL SUPERCONDUCTORS." International Journal of Modern Physics B 18, no. 06 (March 10, 2004): 867–82. http://dx.doi.org/10.1142/s021797920402401x.

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In light of recent experiments, the study of the collective excitations in unconventional superconductors (USC) becomes very important. We build by path integration technique 2D and 3D models of p- and d-pairing for superfluids and superconductors (SC). Within these models we calculate the collective excitations in different USC (high temperature superconductors (HTSC), heavy fermion superconductors (HFSC) etc.) under p- and d-pairing. We considered both bulk and 2D systems. Some recent ideas concerning realization in HTSC of the mixtures of different states are investigated. In particular, we consider the mixture of dx2-y2 and dxy states in HTSC. Obtained results could be used for interpretation of the sound and microwave absorption data as well as for identification of the type of pairing and order parameter in unconventional superconductors.

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Більше джерел

Дисертації з теми "2D superconductors"

Saputo, Roberto. "Two dimensional P-wave superconductors with long range interactions." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/16315/.

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L' interesse crescente che circonda lo studio delle proprietà topologiche della materia è profondamente collegato all' effettiva possibilità di verifica in laboratorio. Negli ultimi decenni infatti la fisica sperimentale degli atomi ultrafreddi ha raggiunto livelli di precisione prima inimmaginabili. Attraverso reticoli ottici si possono riprodurre sistemi multicorpo fortemente interagenti di cui si possono controllare in maniera quasi esatta i parametri fisici, come i potenziali. In questo contesto si inserisce il modello bidimensionale P-wave con interazioni a lungo raggio. Le interazioni in questo modello avvengono tra tutte le componenti, quindi in tutte le direzioni. Questo sistema fisico topologico inoltre è caratterizzato da una Hamiltoniana con potenziale di interazione che decade con la distanza secondo una legge di potenza per cui, per quanto detto, la sua realizzazione sperimentale è possibile. In questo lavoro abbiamo iniziato studiando lo spettro di questo sistema partendo da un approccio analitico. Dopo aver compreso il comportamento dei vari termini energetici abbiamo selezionato dei casi di studio per diversi range di interazione. In questi casi successivamente abbiamo analizzato le varie fasi e transizioni di fase tramite simulazioni numeriche. All' aumentare del range di interazione abbiamo visto l' emergere di nuovi fenomeni assenti nei modelli con interazione a corto raggio.

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Ménard, Gerbold Christophe Bertrand. "2D superconductors perturbed by local magnetism : from Yu-Shiba-Rusinov bound states to Majorana quasiparticles." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066222/document.

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L'un des buts de la physique de la matière condensée est à l'heure actuelle de fournir de nouveaux systèmes topologiques en particulier dans le domaine de la supraconductivité. L'une des manières envisagée pour générer des supraconducteurs topologiques est d'utiliser une interaction magnétique locale sous la forme de chaînes d'impuretés magnétiques, de vortex ou de clusters d'impuretés magnétiques ordonnées. Dans cette thèse nous avons étudié un ensemble d'effets en partant de l'étude d'impuretés individuelles en allant jusqu'aux clusters organisés en interaction avec un supraconducteur bidimensionnel. En utilisant la microscopie et la spectroscopie tunnel nous avons étudié des monocrystaux de 2H-NbSe$_{2}$ ainsi que les monocouches de Pb/Si(111). En raison du caractère électronique bi-dimensionnel de ces deux systèmes nous avons pu montrer que l'étendue spatiale des états liés induits par des impuretés magnétiques était considérablement augmentée en comparaison avec les supraconducteurs tridimensionnels. En combinant ces atomes magnétiques par auto-assemblage nous sommes parvenus à réaliser des clusters ferromagnétiques qui génèrent une supraconductivité topologique dans la monocouche de Pb. Nous présentons en particulier ici la mesure d'états de bords topologiques à l'interface entre Pb/Si(111) et Pb/Co/Si(111). Nous présentons également la mesure d'états liés à zéro énergie au centre de clusters magnétiques signant la présence de fermions de Majorana dans ces systèmes
One of the present days goals of condensed matter physics is to create new systems with topological properties, especially in the field of superconductivity. One of the ways envisioned to create topological superconductors is to locally induce a magnetic interaction in the form of chains of magnetic impurities, vortices or magnetic clusters of ordered magnetic impurities. In this thesis we studied a set of effects from individual impurities to organized clusters interacting with two-dimensional superconductors. Using scanning tunneling microscopy and spectroscopy we considered two systems, monocrystals of 2H-NbSe$_{2}$ and monolayers of Pb/Si(111). Thanks to the two-dimensional electronic behavior of these two systems we show how the spatial extent of the bound states induced by magnetic impurities is considerably enhanced compared to the case of a three-dimensional superconductor. By combining these magnetic atoms using a self-assembly method we were able to create ferromagnetic clusters that lead to a topological superconductivity in Pb monolayers. In particular we present here measurement of topological edge states at the interface Pb/Si(111) and Pb/Co/Si(111). We also present the measurement of zero bias peaks in the center of larger magnetic clusters that sign the presence of Majorana fermions in these systems. Our results show that an adequate patterning of surfaces could realize topological patches and call for a pursuit of the efforts in the subject in order to be able to control Majorana fermions that could eventually lead to breakthrough in quantum computation

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Runge, Katharina. "Visualisation de fluxoides dans des réseaux 2D artificiels supraconducteurs." Phd thesis, Grenoble 1, 1993. http://tel.archives-ouvertes.fr/tel-00356016.

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Nous avons mis au point une cellule de décoration, permettant de décorer les vortex à basse température (jusqu'à 1.6K) sous faible champ magnétique (jusqu'à 0.2mT). La méthode est basée sur l'interaction des gradients de champs dus aux vortex avec des particules ferromagnétiques fabriquées in-situ dans un gaz résiduel. Après réchauffement, l'observation des amas de nickel se fait sous le microscope électronique à balayage. Les échantillons étudiés sont des réseaux 2D submicroniques de fils en niobium (pas du réseau 1-2 µm, largeur des fils 0.3 µm, épaisseur 0.2 µm) avec d'excellentes propriétés supraconductrices (température de transition 9.0K, RRR d'environ 30). Notre calcul de profil de champ magnétique au-dessus d'un réseau montre que le contraste entre cellules avec ou sans vortex est extrêmement faible. Suivant la hauteur au dessus du réseau, nous décorons soit les courants soit les milieux de cellules. La décoration se fait donc sur des réseaux planarisés, à des températures T<

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Longo, Danilo. "Engineering topological states in arrays of magnetic molecules in interaction with a 2D superconductor." Electronic Thesis or Diss., Sorbonne université, 2019. http://www.theses.fr/2019SORUS224.

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Des études récentes ont prédit que l'interaction entre un supraconducteur 2D et du magnétisme local pourrait induire une supraconductivité topologique accompagnée d'états de bord de type Majorana. Pour relever ce défi, nous avons étudié un système basé sur l’interaction entre des auto-assemblages d’aimants moléculaires, tels que les phtalocyanines de manganèse (MnPcs), sur des films minces de plomb (1 et 3 monocouches) épitaxiés sur des surfaces de Si(111) qui montrent une supraconductivité 2D. Nos expériences de Microscopie à effet tunnel (STM) ont révélé que l'adsorption d’une petite quantité de MnPcs sur la monocouche de Pb est accompagnée d’un très faible transfert de charge qui induit une transition de phase structurale macroscopique de la surface elle-même. Les expériences de Spectroscopie à effet tunnel (STS) à 300 mK sur des îlots tricouches de Pb/Si(111) ont montré la présence d'effets non triviaux responsables de la fluctuation spatiale de l’amplitude des pics de cohérence sur des longueurs bien inférieures à la longueur de cohérence supraconductrice. De plus, contrairement à ce qui a été montré sur des monocristaux de plomb, les expériences STS suggèrent que les MnPcs isolées sur des îlots tricouches de plomb se trouvent toujours dans un régime d'interaction faible avec le substrat. L’ensemble de nos résultats, ainsi que l’observation d’une signature spectroscopique localisée sur le bord d’un domaine auto-organisé de MnPcs ouvrent la voie à de futures études sur l’ingénierie des phases topologiques supraconductrices
Recent studies predicted that the interaction between a 2D superconductor and local magnetism could induce topological superconductivity accompanied by Majorana edge states. To address this challenge, we have studied a system based on the interaction between self-assemblies of molecular magnets, i.e. manganese phthalocyanines (MnPcs), and thin films of lead (1 and 3 monolayers) grown on Si(111) surfaces that show 2D superconductivity.Our Scanning Tunneling Microscopy (STM) experiments revealed that, adsorption of a tiny amount of MnPcs on a Pb monolayer is accompanied by a very small charge transfer inducing a macroscopic structural phase transition of the surface itself. Scanning Tunneling Spectroscopy (STS) experiments at 300mK on 3 monolayers thick islands of Pb/Si(111) showed the presence of non-trivial effects responsible for the spatial fluctuation of the coherence peaks amplitude on a length scale much smaller than the superconducting coherence length. Furthermore, contrary to what shown on bulk Pb substrates, STS experiments strongly suggest that isolated MnPcs are always found in a weak interaction regime with the 3 monolayers thick Pb islands. Our results together with the observation of an in-gap spectroscopic feature located at the edge of a self-assembled 2D domain of MnPcs pave the route to future studies for the engineering of superconducting topological phases

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Killiches, Susanne Judith. "SUPERCONDUCTIVITY IN A 2D SEMICONDUCTOR SYSTEM WITH UNCONVENTIONAL PAIRING SYMMETRY: INTER-BAND PAIRING." [Kent, Ohio] : Kent State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=kent1164129248.

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Thesis (M.S.)--Kent State University, 2006.
Title from PDF t.p. (viewed July 9, 2007). Advisor: Khandker Quader. Keywords: superconductor-insulator-transition, semiconductor. Includes bibliographical references (p. 69-70).

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Lu, Chih-Pin, and 呂志彬. "TRANSPORT AND SCANNING TUNNELING MICROSCOPY STUDIES OF 2D MATERIALS AND FeSe0.5Te0.5 SUPERCONDUCTORS." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/59942327112846977406.

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博士
國立臺灣大學
物理研究所
102
Researchers have paying intense attention to other two-dimensional (2D) layer crystals such as isolated monolayer graphene and thin-layer crystals of hexagonal boron nitride (hBN), molybdenum disulphide (MoS2), other dichalcogenides, superconductors and combination of them. This thesis presents results of transport and scanning tunneling microscopy (STM) and spectroscopy (STS) experiments on these novel 2D materials and superconductor at low temperatures and in magnetic field. The main findings include that: First, the observation of improvement of graphene device quality by putting another graphene layer underneath. Second, the interaction between graphene and MoS2 as carrier density changed by back gate voltage. Third, we employed scanning tunneling microscopy and spectroscopy combined with gated transport to probe the semiconductor properties of 2H-MoS2. The main conclusions are that n-doping in bulk 2H-MoS2 are caused by S vacancies and the significantly higher doping observed in thin films deposited on SiO2 are likely due to trapped donors SiO2 interface. Finally, we try to study the interaction between graphene and FeSe0.5Te0.5 superconductor by STM and it is still on-going project.

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Pathak, Sandeep. "Ground State Studies Of Strongly Correlated 2D Systems." Thesis, 2010. http://hdl.handle.net/2005/1924.

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The quest for obtaining higher Tc superconductivity led to the discovery of cuprates about 20 years ago. Since then, they continue to puzzle the scientific community with their bizarre properties like non-BCS superconductivity, pseudo gap, Fermi arcs, linear T resistivity etc. Since these materials show unusually high Tc, a novel mechanism is at play and strong correlations are believed to play an important role. The theme of this thesis work is to study physics of such strongly correlated systems in two dimensions at T = 0 along with development of new theoretical tools necessary for the study. The focus of the thesis is on the ground state studies of strongly correlated models like t-J and Hubbard models using variational Monte Carlo (VMC) and renormalized mean field theory (RMFT). The general method is to propose a variational wave function, motivated by the physics ideas, to be a candidate ground state of the system. Methods to efficiently evaluate the ground state energy and minimizing it with respect to the variational parameters are developed in this work. Antiferromagnetism-superconductivity competition and electron-hole asymmetry in the extended t-J model is investigated. The main result of this work is that increasing the magnitude of the next neighbor hopping (t') on hole doped side strengthen superconductivity while it stabilizes antiferromagnetism on the electron doped side. It is also shown that it is possible to characterize the T = 0 phase diagram with just one parameter called as Fermi Surface Convexity Parameter (FSCP). Next, the possibility of phase separation in the t-J model on a square lattice is investigated using local RMFT technique. It is found that for certain doping, the system phase separates into regions with antiferromagnetic and superconducting orders. Next, the role played by crystalline anisotropy of orthorhombic YBCO cuprates on their properties is examined using anisotropic tx-ty-J model and this ground state study suggests that the anisotropies seen in their properties are plausible solely due to the crystalline anisotropy. A new general method to study strongly correlated systems with singlet ground states is developed and tested in this thesis work. The last part of the thesis explores the possibility of high Tc superconductivity in graphene which is a intermediate coupling resonating valence bond (RVB) system. It is found that undoped graphene is not a superconductor, consistent with the experiments. On doping, the ground state of graphene is found to be a superconductor with “d+id” symmetry whose strength shows a dome as a function of doping which is reminiscent of RVB physics.

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Maji, Maheswar. "Magnetisation, Phases & Phase Transitions in Frustrated and Unfrustrated XY Model." Thesis, 2011. http://hdl.handle.net/2005/3168.

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Through our whole work we study the XY model with all its entirety, a particular spin model where spins are confined in a plane. We try to bring out a good understanding of this model with all different types of phases and phase transition, it undergoes in critical situations. We conceive of these external conditions from very different physical models like High Tc Superconductor, Ultracold atoms in optical lattice which are in focus of recent research. Firstly we model high Tc Superconductors with very simple 2D XY model to get an idea about the diamagnetic response exhibited by these materials when kept in a external magnetic field. This modeling is reasonable because most of the physics of cuprate High Tc Superconductors are governed by their 2D copper oxide planes which insists us to consider 2D models. Later we shifted to a more realistic 3D anisotropic XY model , as the coupling between cuprates plane may have a considerable role in devising physics of those materials. We particularly focus on the 2D to 3D crossover effect on magnetisation showed by these models, with keeping an eye on how all these can be relate to the experimentally acquired magnetisation profile of High Tc Supercondutors. On the second project we investigate on the phase diagram of a fully frustrated 2-leg ladder Bose Hubbard model. After mapping it properly to a classical model, a bi-layer Fully Frustrated XY model on square lattice, we found that the frustration leads to the emergence of a new phase "Chiral Mott insulator(CMI)" sandwiched between "Chiral Superﬂuid(CSF)" and "regular Mott insulator(MI)" phase. We divide the whole report into four parts. The first chapter is basically contain-ing introductory part comprising the motivation. In the second chapter we discuss various types of phases and phase transitions of the 2D & 3D XY models. We try to address their critical behaviors. In the third chapter and onwards we consider our model in external magnetic field and observe magnetisation in these systems. Here we specially focus on 2D to 3D crossover effect on magtisation measurement. Lastly in the fourth chapter we bring out a correspondence of XY model with the 2 leg ladder fully frustrated Bose Hubbard Model. There we report the emergence of a new phase, Chiral Mott Insulator(CMI) due to frustration in system.

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Wang, Zhuo. "Magneto-transport Study of 3D Topological Insulator Bi2Te3 And GaAs/AlGaAs 2D Electron System." 2017. http://scholarworks.gsu.edu/phy_astr_diss/96.

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Magneto-transport study on high mobility electron systems in both 2D- and 3D- case has attracted intense attention in past decades. This thesis focuses on the magnetoresistance behavior in 3D topological insulator Bi2Te3 and GaAs/AlGaAs 2D electron system at low magnetic field range 0.4T the first drop at T~3.4K to tndium superconductor and considered the second drop at lower temperature as the proximity effect that occurred near the interface between these two materials. On the other hand, GaAs/AlGaAs heterostructure, as a III-V semiconductor family, has been extensively studied for exploring many interesting phenomena due to the extremely high electron mobility up to 10^7 cm^2/Vs. In this thesis, two interesting phenomena are present and discussed in a GaAs/AlGaAs system, which are the electron heating induced tunable giant magnetoresistance study and phase inversion in Shubnikov-de Haas oscillation study, respectively. By applying elevated supplementary dc current bias, we found a tunable giant magnetoresistance phenomenon which is progressively changed from positive to giant negative magnetoresistance. The observed giant magnetoresistance is successfully simulated with a two-term Drude model at all different dc biases, I_{dc}, and temperature, T. In addition, as increasing the dc current bias, a phase inversion behavior was observed in Shubnikov-de Haas oscillation, which was further demonstrated by the simulation with an exponential damped cosine function. This thesis also presents an ongoing project, which is the observation and fabrication of 2D layered materials. The studied 2D layered materials includes graphene, biron nitride, Molybdenum disulfide, etc. At the end, a future work about fabrication of the 2D layered materials devices as well as the suggestion about the measurement are discussed.

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Книги з теми "2D superconductors"

Sergeenkov, Sergei. 2D arrays of Josephson nanocontacts and nanogranular superconductors. Edited by A. V. Narlikar and Y. Y. Fu. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780199533046.013.21.

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This article examines many novel effects related to the magnetic, electric, elastic and transport properties of Josephson nanocontacts and nanogranular superconductors using a realistic model of two-dimensional Josephson junction arrays. The arrays were created by a 2D network of twin-boundary dislocations with strain fields acting as an insulating barrier between hole-rich domains in underdoped crystals. The article first describes a model of nanoscopic Josephson junction arrays before discussing some interesting phenomena, including chemomagnetism and magnetoelectricity, electric analog of the ‘fishtail‘ anomaly and field-tuned weakening of the chemically induced Coulomb blockade, a giant enhancement of the non-linear thermal conductivity in 2D arrays, and thermal expansion of a singleJosephson contact.

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Daghero, D., G. A. Ummarino, and R. S. Gonnelli. Andreev Reflection and Related Studies in Low-Dimensional Superconducting Systems. Edited by A. V. Narlikar. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780198738169.013.5.

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This article investigates the potential of the point contact Andreev reflection spectroscopy (PCARS) technique for measuring the symmetry of the energy gap and other key parameters of various 0-, 1-, and 2-dimensional superconducting systems. It begins with a brief description of PCARS, explaining what a point contact is and how it can be made and the conditions under which a PC is ballistic, as well as why and to what extent a PC between normal metals is spectroscopic. It then discusses the basics of Andreev reflection and the length scales in mesoscopic systems before considering the limits of applicability of PCARS for spectroscopy of ‘small’ superconductors. Finally, it reviews some examples of PCARS in quasi-0D, quasi-1D and quasi-2D superconductors.

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Cuevas, J. C., D. Roditchev, T. Cren, and C. Brun. Proximity Effect A New Insight from In Situ Fabricated Hybrid Nanostructures. Edited by A. V. Narlikar. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780198738169.013.4.

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This article investigates the proximity effect on small length and energy scales in novel low-dimensional systems using in situ fabricated superconducting nanostructures (SNSs) and scanning tunneling microscopy/spectroscopy (STM/STS) techniques. After a brief historical review of research on superconductivity and the proximity effect, the article describes how to build a variety of in situ superconducting hybrid nanostructures and how to investigate the proximity density of states with the help of STM/STS. It then considers the proximity effect in a correlated 2D disordered metal and in diffusive SNS junctions before discussing proximity Josephson vortices. It also examines the proximity effect between two dissimilar superconductors and concludes by highlighting several fundamental problems related to proximity effect in the framework of quasiclassical microscopic Usadel theory.

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Частини книг з теми "2D superconductors"

Buzdin, A., and V. Dorin. "Magnetic Field Crossover Between 2D and 3D Regimes of Gaussian Fluctuations in Layered Superconductors." In Fluctuation Phenomena in High Temperature Superconductors, 335–41. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5536-6_27.

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Moshchalkov, V. V., L. Trappeniers, and J. Vanacken. "Pseudo-Gap and Crossover from the 2D Heisenberg to the Even-Leg Spin-Ladder Regime in Underdoped Cuprates." In Symmetry and Pairing in Superconductors, 327–36. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4834-4_29.

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Lang, Michael, Jens Müller, Frank Steglich, John Schlueter, and Takahiko Sasaki. "Exploring the Phase Diagram of the Quasi-2D Organic Superconductors κ -(BEDT-TTF)2X." In Concepts in Electron Correlation, 85–93. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-010-0213-4_9.

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Maniv, T., and V. Zhuravlev. "The Vortex Liquid State in a 2D Superconductor at High Magnetic Fields." In Recent Trends in Theory of Physical Phenomena in High Magnetic Fields, 61–74. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-010-0221-9_6.

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Okuma, Satoshi, Satoshi Shinozaki, and Nobuhito Kokubo. "The T=0 Phase Diagram of the Field-Driven Superconductor-Insulator Transition in 2D." In Advances in Superconductivity XI, 185–88. Tokyo: Springer Japan, 1999. http://dx.doi.org/10.1007/978-4-431-66874-9_38.

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Brusov, Peter, and Tatiana Filatova. "Path Integral Two Dimensional Models of P– and D–Wave Superconductors and Collective Modes." In Real Perspective of Fourier Transforms and Current Developments in Superconductivity. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.97041.

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The main parameter, which describes superfluids and superconductors and all their main properties is the order parameter. After discovery the high temperature superconductors (HTSC) and heavy fermion superconductors (HFSC) the unconventional pairing in different superconductors is studied very intensively. The main problem here is the type of pairing: singlet or triplet, orbital moment of Cooper pair value L, symmetry of the order parameter etc. Recent experiments in Sr2RuO4 renewed interest in the problem of the symmetry of the order parameters of the HTSC. The existence of CuO2 planes – the common structural factor of HTSC – suggests we consider two-dimensional (2D) models. A 2D– model of p–pairing using a path integration technique has been developed by Brusov and Popov. A 2D model of d–pairing within the same technique has been developed by Brusov et al. All properties of 2D–superconductors (for example, of CuO2 planes of HTSC) and, in particular, the collective excitations spectrum, are determined by these functionals. We consider all superconducting states, arising in symmetry classification of p-wave and d-wave 2D–superconductors, and calculate the full collective modes spectrum for each of these states. This will help to identify the type of pairing and the symmetry of the order parameter in HTSC and HFSC.

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Larkin, Anatoly, and Andrei Varlamov. "PHASE FLUCTUATIONS IN A 2D SUPERCONDUCTING SYSTEM." In Theory of Fluctuations in Superconductors, 335–42. Oxford University Press, 2005. http://dx.doi.org/10.1093/acprof:oso/9780198528159.003.0015.

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Geng, Xun, and Jiabao Yi. "The Development of High-Temperature Superconductors and 2D Iron-Based Superconductors." In Nano-Sized Multifunctional Materials, 117–44. Elsevier, 2019. http://dx.doi.org/10.1016/b978-0-12-813934-9.00006-2.

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"Collective Excitations in the Planar 2D–Phase of Superfluid 3He." In Collective Excitations in Unconventional Superconductors and Superfluids, 345–54. WORLD SCIENTIFIC, 2009. http://dx.doi.org/10.1142/9789812771247_0015.

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"Granular superconductors: the Josephson lattice in 2D and 3D." In Superconductivity, 91–94. Cambridge University Press, 1999. http://dx.doi.org/10.1017/cbo9781139171090.019.

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Тези доповідей конференцій з теми "2D superconductors"

Barabanov, A. F. "Theory of the spin-polaron for 2D antiferromagnets." In Fourth training course in the physics of correlated electron systems and high-Tc superconductors: Lectures on the physics of highly correlated electron systems IV. AIP, 2000. http://dx.doi.org/10.1063/1.1309171.

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Hague, J. P. "Extending the Theory of Phonon-mediated Superconductivity in quasi-2D." In LECTURES ON THE PHYSICS OF HIGHLY CORRELATED ELECTRON SYSTEMS X: Tenth Training Course in the Physics of Correlated Electron Systems and High Tc Superconductors. AIP, 2006. http://dx.doi.org/10.1063/1.2222274.

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TAKAHASHI, S., A. E. KOVALEV, S. HILL, S. TAKASAKI, J. YAMADA, H. ANZAI, J. S. QUALLS, et al. "FERMI SURFACE STUDIES OF QUASI-1D and QUASI-2D ORGANIC SUPERCONDUCTORS USING PERIODIC ORBIT RESONANCE IN HIGH MAGNETIC FIELDS." In Proceedings of the 16th International Conference. WORLD SCIENTIFIC, 2005. http://dx.doi.org/10.1142/9789812701923_0006.

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Fukuzawa, T., S. Y. Kim, T. K. Gustafson, E. E. Haller, and E. Yamada. "Anomalous Diffusion of Repulsive Bosons in a Two-Dimensional Random Potential." In Quantum Optoelectronics. Washington, D.C.: Optica Publishing Group, 1997. http://dx.doi.org/10.1364/qo.1997.qthb.2.

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Two-dimensional (2D) bosons can undergo a Kosterlitz-Thouless transition[1], which does not involve macroscopic occupation of a single quantum state, but which can still result in superfluidity. In addition, strongly interacting bosons subject to a random potential can also exhibit superfluidity, as in the case of charged superfluidity that occurs in high-T c superconductors. Competition between the strength of the interaction and the degree of potential disorder are among the many complicated and competing factors which determine whether superfluidity is promoted or supressed in a Bose system[2]. Strong potential disorder forces bosons to localize and can result in an insulating Bose glass phase. Alternatively, repulsive interactions among bosons act to release them from their traps, to keep their inter-particle distances as uniform as the potential allows, and to arrange the flow direction. An appropriate interaction strength can thus promote superfluidity.

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Ledwaba, Kabelo, Sina Karimzadeh, Andile Mkhohlakali, and Tien-Chien Jen. "Yttrium Decorated on Thin Borophene Defect for Hydrogen Storage: A First Principles Study." In ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-69160.

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Abstract Borophene- two-dimensional (2D) is an emerging material that has engrossed much consideration in the field of energy materials They exhibit a broad range of various incredible properties, which were considered as ground-breaking for different application such as batteries, superconductors, anode materials for photochemical water splitting, and biosensors and super capacitors. Yttrium-decorated borophene (Y-borophene) as a carrier for hydrogen storage have been studied. DFT calculations based on the Dmol3 code were used to investigate adsorption energy and optimal geometry for hydrogen adsorption on pure borophene and Y-borophene. Isolated yttrium atom on borophene have studied for defect. For Y-borophene, the yttrium atom can adsorb eight hydrogen molecules with average adsorption energy of 0.461 eV/H2 which has increased adsorption energy by 33% compared to the pure borophene with the same condition. The hydrogen storage capacity of this material is 15.23 wt.%, demonstrating Y-borophene as a promising candidate for hydrogen storage. In addition, the density of states plots (PDOS) is presented to further comprehend the electronic structures and bonding nature.

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TRIVEDI, NANDINI, YEN LEE LOH, KARIM BOUADIM, and MOHIT RANDERIA. "ASPECTS OF LOCALIZATION ACROSS THE 2D SUPERCONDUCTOR-INSULATOR TRANSITION." In Proceedings of the Satellite Conference of LT 26. WORLD SCIENTIFIC, 2012. http://dx.doi.org/10.1142/9789814436861_0003.

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Khusainov, M. G., N. G. Fazleev, M. M. Khusainov, and Yu N. Proshin. "2D Inhomogeneous Superconducting States And Umklapp Processes In Ferromagnet/Superconductor Nanostructures." In LOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24. AIP, 2006. http://dx.doi.org/10.1063/1.2354994.

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Parendo, Kevin A., K. H. Sarwa, B. Tan, A. Bhattacharya, M. Eblen-Zayas, N. Staley, and A. M. Goldman. "Tuning the 2D Superconductor-Insulator Transition by Use of the Electric Field Effect." In LOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24. AIP, 2006. http://dx.doi.org/10.1063/1.2355018.

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Cui, Qinghong, C. R. Hu, J. Y. T. Wei, and Kun Yang. "Conductance Characteristics between a Normal Metal and a 2D Fulde-Ferrell-Larkin-Ovchinnikov Superconductor." In LOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24. AIP, 2006. http://dx.doi.org/10.1063/1.2354914.

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