Готові списки джерел за темами / Topological physics

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Добірка наукової літератури з теми "Topological physics"

Автор: Grafiati
Опубліковано: 14 вересня 2024

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Статті в журналах з теми "Topological physics"

1

Ota, Yasutomo, Kenta Takata, Tomoki Ozawa, Alberto Amo, Zhetao Jia, Boubacar Kante, Masaya Notomi, Yasuhiko Arakawa, and Satoshi Iwamoto. "Active topological photonics." Nanophotonics 9, no. 3 (January 28, 2020): 547–67. http://dx.doi.org/10.1515/nanoph-2019-0376.

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AbstractTopological photonics emerged as a novel route to engineer the flow of light. Topologically protected photonic edge modes, which are supported at the perimeters of topologically nontrivial insulating bulk structures, are of particular interest as they may enable low-loss optical waveguides immune to structural disorder. Very recently, there has been a sharp rise of interest in introducing gain materials into such topological photonic structures, primarily aiming at revolutionizing semiconductor lasers with the aid of physical mechanisms existing in topological physics. Examples of remarkable realizations are topological lasers with unidirectional light output under time-reversal symmetry breaking and topologically protected polariton and micro/nanocavity lasers. Moreover, the introduction of gain and loss provides a fascinating playground to explore novel topological phases, which are in close relevance to non-Hermitian and parity-time symmetric quantum physics and are, in general, difficult to access using fermionic condensed matter systems. Here, we review the cutting-edge research on active topological photonics, in which optical gain plays a pivotal role. We discuss recent realizations of topological lasers of various kinds, together with the underlying physics explaining the emergence of topological edge modes. In such demonstrations, the optical modes of the topological lasers are determined by the dielectric structures and support lasing oscillation with the help of optical gain. We also address recent research on topological photonic systems in which gain and loss, themselves, essentially influence topological properties of the bulk systems. We believe that active topological photonics provides powerful means to advance micro/nanophotonics systems for diverse applications and topological physics, itself, as well.
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2

Cho, Y. M., Seung Hun Oh, and Pengming Zhang. "Knots in physics." International Journal of Modern Physics A 33, no. 07 (March 8, 2018): 1830006. http://dx.doi.org/10.1142/s0217751x18300065.

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After Dirac introduced the monopole, topological objects have played increasingly important roles in physics. In this review we discuss the role of the knot, the most sophisticated topological object in physics, and related topological objects in various areas in physics. In particular, we discuss how the knots appear in Maxwell’s theory, Skyrme theory, and multicomponent condensed matter physics.
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3

Kim, Ki-Seok, and Akihiro Tanaka. "Emergent gauge fields and their nonperturbative effects in correlated electrons." Modern Physics Letters B 29, no. 16 (June 20, 2015): 1540054. http://dx.doi.org/10.1142/s0217984915400540.

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The history of modern condensed matter physics may be regarded as the competition and reconciliation between Stoner’s and Anderson’s physical pictures, where the former is based on momentum–space descriptions focusing on long wave-length fluctuations while the latter is based on real-space physics emphasizing emergent localized excitations. In particular, these two view points compete with each other in various nonperturbative phenomena, which range from the problem of high [Formula: see text] superconductivity, quantum spin liquids in organic materials and frustrated spin systems, heavy-fermion quantum criticality, metal-insulator transitions in correlated electron systems such as doped silicons and two-dimensional electron systems, the fractional quantum Hall effect, to the recently discussed Fe-based superconductors. An approach to reconcile these competing frameworks is to introduce topologically nontrivial excitations into the Stoner’s description, which appear to be localized in either space or time and sometimes both, where scattering between itinerant electrons and topological excitations such as skyrmions, vortices, various forms of instantons, emergent magnetic monopoles, and etc. may catch nonperturbative local physics beyond the Stoner’s paradigm. In this review paper, we discuss nonperturbative effects of topological excitations on dynamics of correlated electrons. First, we focus on the problem of scattering between itinerant fermions and topological excitations in antiferromagnetic doped Mott insulators, expected to be relevant for the pseudogap phase of high [Formula: see text] cuprates. We propose that nonperturbative effects of topological excitations can be incorporated within the perturbative framework, where an enhanced global symmetry with a topological term plays an essential role. In the second part, we go on to discuss the subject of symmetry protected topological states in a largely similar light. While we do not introduce itinerant fermions here, the nonperturbative dynamics of topological excitations is again seen to be crucial in classifying topologically nontrivial gapped systems. We point to some hidden links between several effective field theories with topological terms, starting with one-dimensional physics, and subsequently finding natural generalizations to higher dimensions.
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4

Hafezi, Mohammad, and Jacob M. Taylor. "Topological physics with light." Physics Today 67, no. 5 (May 2014): 68–69. http://dx.doi.org/10.1063/pt.3.2394.

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5

Shuo, LIU, ZHANG Shuang, and CUI Tie-jun. "Topological circuit: a playground for exotic topological physics." Chinese Optics 14, no. 4 (2021): 736–53. http://dx.doi.org/10.37188/co.2021-0095.

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6

Shen, Yuanyuan, Shengguo Guan, and Chunyin Qiu. "Topological valley transport of spoof surface acoustic waves." Journal of Applied Physics 133, no. 11 (March 21, 2023): 114305. http://dx.doi.org/10.1063/5.0137591.

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In recent years, topological physics has attracted broad attention in condensed matter systems. Here, we report an experimental study on topological valley transport of spoof surface acoustic waves (SAWs). Specifically, we realize valley pseudospins and a valley Hall phase transition by tuning the structural size of adjacent grooves. In addition to a direct visualization of the vortex chirality-locked beam splitting for the bulk valley states, valley-projected edge states are observed in straight and bent interface channels formed by two topologically distinct valley Hall insulating phases. The experimental data agree well with our numerical predictions. The topological transport of spoof SAWs, encoded with valley information, provides more possibilities in design novel acoustic devices based on the valley-contrasting physics.
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7

HAN, Jung Hoon. "Solid State Physics, Condensed Matter Physics, and Topological Physics!" Physics and High Technology 25, no. 12 (December 30, 2016): 2–6. http://dx.doi.org/10.3938/phit.25.060.

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8

Novitsky, Denis V., and Andrey V. Novitsky. "Bound States in the Continuum versus Fano Resonances: Topological Argument." Photonics 9, no. 11 (November 20, 2022): 880. http://dx.doi.org/10.3390/photonics9110880.

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There is a recent surge of interest to the bound states in the continuum (BICs) due to their ability to provide high-quality resonances in open photonic systems. They are usually observed in perturbed systems possessing Fano resonances in their spectra. We argue that, generally speaking, the Fano resonances should not be considered as a proxy for BICs (as it is often done) due to their fundamentally different topological properties. This difference is illustrated with the non-Hermitian layered structure supporting both topologically nontrivial quasi-BIC and topologically trivial Fano resonances. Non-Hermiticity can also be a source of additional topological features of these resonant responses. Moreover, the lasing mode associated with BIC in this structure also possesses nonzero topological charge that can be useful for producing unconventional states of light. This paper contributes to the discussion of BIC physics and raises new questions concerning topological properties of non-Hermitian systems.
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9

Liu, Shuo, Wenlong Gao, Qian Zhang, Shaojie Ma, Lei Zhang, Changxu Liu, Yuan Jiang Xiang, Tie Jun Cui, and Shuang Zhang. "Topologically Protected Edge State in Two-Dimensional Su–Schrieffer–Heeger Circuit." Research 2019 (February 5, 2019): 1–8. http://dx.doi.org/10.34133/2019/8609875.

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Topological circuits, an exciting field just emerged over the last two years, have become a very accessible platform for realizing and exploring topological physics, with many of their physical phenomena and potential applications as yet to be discovered. In this work, we design and experimentally demonstrate a topologically nontrivial band structure and the associated topologically protected edge states in an RF circuit, which is composed of a collection of grounded capacitors connected by alternating inductors in the x and y directions, in analogy to the Su–Schrieffer–Heeger model. We take full control of the topological invariant (i.e., Zak phase) as well as the gap width of the band structure by simply tuning the circuit parameters. Excellent agreement is found between the experimental and simulation results, both showing obvious nontrivial edge state that is tightly bound to the circuit boundaries with extreme robustness against various types of defects. The demonstration of topological properties in circuits provides a convenient and flexible platform for studying topological materials and the possibility for developing flexible circuits with highly robust circuit performance.
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10

Liu, Shuo, Wenlong Gao, Qian Zhang, Shaojie Ma, Lei Zhang, Changxu Liu, Yuan Jiang Xiang, Tie Jun Cui, and Shuang Zhang. "Topologically Protected Edge State in Two-Dimensional Su–Schrieffer–Heeger Circuit." Research 2019 (February 5, 2019): 1–8. http://dx.doi.org/10.1155/2019/8609875.

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Анотація:
Topological circuits, an exciting field just emerged over the last two years, have become a very accessible platform for realizing and exploring topological physics, with many of their physical phenomena and potential applications as yet to be discovered. In this work, we design and experimentally demonstrate a topologically nontrivial band structure and the associated topologically protected edge states in an RF circuit, which is composed of a collection of grounded capacitors connected by alternating inductors in the x and y directions, in analogy to the Su–Schrieffer–Heeger model. We take full control of the topological invariant (i.e., Zak phase) as well as the gap width of the band structure by simply tuning the circuit parameters. Excellent agreement is found between the experimental and simulation results, both showing obvious nontrivial edge state that is tightly bound to the circuit boundaries with extreme robustness against various types of defects. The demonstration of topological properties in circuits provides a convenient and flexible platform for studying topological materials and the possibility for developing flexible circuits with highly robust circuit performance.
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Дисертації з теми "Topological physics"

1

Tapio, O. (Ossi). "Topological defects in cosmology." Master's thesis, University of Oulu, 2013. http://urn.fi/URN:NBN:fi:oulu-201302121030.

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In this dissertation I use one dimensional numerical simulations of classical scalar field theories to study density of topological defects. I devise and compare three methods of counting defects and run multiple simulations with varying parameters. Thesis begins with general description of evolution of the Universe and how topological defects might have influenced it. This is followed by general mathematical description of Kibble-Zurek Mechanism (the mechanism that causes topological defects to form). In the first chapter I go through of all textbook theory regarding one dimensional field and defects needed to understand the model I am simulating, the model itself being a 1+1 dimensional scalar field theory with O(N) symmetry. In the second chapter I derive three methods for finding defects in the simulation data. In the third chapter I describe the simulations themselves and go through the immediate results. In the fourth chapter I discuss the results of the simulations and suggest future simulations in order to study this subject further. In the Appendix are exact results of simulations, more detailed derivation of certain equations and the simulation code written in pseudo-code.
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2

Moore, Christopher Paul. "Tunneling Transport Phenomena in Topological Systems." Thesis, Clemson University, 2019. http://pqdtopen.proquest.com/#viewpdf?dispub=13420479.

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Originally proposed in high energy physics as particles, which are their own anti-particles, Majorana fermions have never been observed in experiments. However, possible signatures of their condensed matter analog, zero energy, charge neutral, quasiparticle excitations, known as Majorana zero modes (MZMs), are beginning to emerge in experimental data. The primary method of engineering topological superconductors capable of supporting MZMs is through proximity-coupled semiconductor nanowires with strong Rashba spin-orbit coupling and an applied magnetic field. Recent tunneling transport experiments involving these materials, known as semiconductor-superconductor heterostructures, were capable for the first time of measuring quantized zero bias conductance plateaus, which are robust over a range of control parameters, long believed to be the smoking gun signature of the existence of MZMs. The possibility of observing Majorana zero modes has garnered great excitement within the field due to the fact that MZMs are predicted to obey non-Abelian quantum statistics and therefore are the leading candidates for the creation of qubits, the building blocks of a topological quantum computer. In this work, we first give a brief introduction to Majorana zero modes and topological quantum computing (TQC). We emphasize the importance that having a true topologically protected state, which is not dependent on local degrees of freedom, has with regard to non-Abelian braiding calculations. We then introduce the concept of partially separated Andreev bound states (ps-ABSs) as zero energy states whose constituent Majorana bound states (MBSs) are spatially separated on the order of the Majorana decay length. Next, through numerical calculation, we show that the robust 2 e2/h zero bias conductance plateaus recently measured and claimed by many in the community to be evidence of having observed MZMs for the first time, can be identically created due to the existence of ps-ABSs. We use these results to claim that all localized tunneling experiments, which have been until now the main way researchers have tried to measure MZMs, have ceased to be useful. Finally, we outline a two-terminal tunneling experiment, which we believe to be relatively straight forward to implement and fully capable of distinguishing between ps-ABSs and true topologically protected MZMs.

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3

Timothy, H. Hsieh Timothy (Timothy Hwa-wei). "Topological materials and quantum entanglement." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/103228.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 2015.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 83-91).
As the title implies, this thesis consists of two main topics: materials which realize topological phases of matter and applications of the concept of entanglement in understanding topological phases and their transitions. The first part will focus on a particular class of materials called topological crystalline insulators (TCI), which are bulk insulators with metallic boundary states protected by crystal mirror symmetries. The realization of TCIs in the SnTe class of materials and the anti-perovskite family will be described. The second part will focus on using entanglement notions to probe a topological phase transition, based on a single topological wavefunction. This is achieved by performing extensive partitions of the wavefunction, such as a checkerboard partition. Implementing this technique in one dimension naturally involves the use of tensor networks, which will be reviewed and then utilized.
by Timothy H. Hsieh.
Ph. D.
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4

Chess, Jordan J. "Mapping Topological Magnetization and Magnetic Skyrmions." Thesis, University of Oregon, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10684160.

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A 2014 study by the US Department of Energy conducted at Lawrence Berkeley National Laboratory estimated that U.S. data centers consumed 70 billion kWh of electricity. This represents about 1.8% of the total U.S. electricity consumption. Putting this in perspective 70 billion kWh of electricity is the equivalent of roughly 8 big nuclear reactors, or around double the nation's solar panel output. Developing new memory technologies capable of reducing this power consumption would be greatly beneficial as our demand for connectivity increases in the future. One newly emerging candidate for an information carrier in low power memory devices is the magnetic skyrmion. This magnetic texture is characterized by its specific non-trivial topology, giving it particle-like characteristics. Recent experimental work has shown that these skyrmions can be stabilized at room temperature and moved with extremely low electrical current densities. This rapidly developing field requires new measurement techniques capable of determining the topology of these textures at greater speed than previous approaches. In this dissertation, I give a brief introduction to the magnetic structures found in Fe/Gd multilayered systems. I then present newly developed techniques that streamline the analysis of Lorentz Transmission Electron Microscopy (LTEM) data. These techniques are then applied to further the understanding of the magnetic properties of these Fe/Gd based multilayered systems.

This dissertation includes previously published and unpublished co-authored material.

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5

Damodaran, K. "Topological defects in cosmology and nuclear physics." Thesis, University of Cambridge, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.598261.

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This dissertation is concerned with topological defects that arise from symmetry breaking in the non-linear sigma model limits of scalar field theories. The nonlinear evolution of global topological defects in O (N) field theories provide a mechansims for sourcing hte cosmic microwave background (CMB) temperature anisotropy on the sky today. In these theories, N determines the type of defect based on the homotopy group of the underlying vacuum manifold. Additionally, in models of nuclear physics based on SU (2) gauge theories, π3 defects can manifest themselves as static soliton solutions. A simple class of O (N) scalar fields are studied here. The defects considered were strings with N =2, monopoles with N =3, textures with N = 4 and a class of "non-topological" textures, with N =6. Calculations of the temperature anisotropy are computationally challenging. High precision is needed in order to cmopare predictions with new and future CMB observations. The anisotropy is calculated from the classic Sachs-Wolfe formula by using a real space evolution for the matter and radiatino fluids. In order to properly account for diffusion damping and the finnite thickness of the last scattering surface, the power spectra were compared to high precision calculations based on defect source stress energy tensor unequal-time correlators. Matching the tails of the spectra yielded an angualr smoothing scale l D for the fluctuation maps. Ensembles of 10° maps of the sky today were produced for each defect. Defects also have implications in modesl of nucelar physics. The first π3 soliton to be studied in nuclear physics was the Skyrmion, a topological solution to the nonlinear sigma model for pion fields. Skyrme introduced a four-derivative term to stabilize the soliton. Alternatively one could introduce gauge fields to stabilize the texture. It is shown that the presence of an extra identical Higgs doublet in a gauged SU (2) nonlinear sigma model can produce soliton solutions. The solution is related to the Sphaleron and Electroweak Skyrmion in the Standard Model, but unlike these solitons, it is dyanmically stable to small spherically symmetric perturbations. A similar solution is shown to exist in the Vector Dominance model, with p-mesons representing the gauge bosons of a hidden local SU (2) gauge symmetry of the nonlinear sigma model. This is in agreement with similar work done by Igarashi, Johmuar, Kobayashi, Otsu, Sato and Sawada.
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6

Yang, Biao. "Photonic topological metamaterials." Thesis, University of Birmingham, 2018. http://etheses.bham.ac.uk//id/eprint/8103/.

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Topology, a mathematical concept associated with global perspectives, was found to represent geometric aspects of physics. To date, various topological phases have been proposed and classified. Among them, topological gapless phases focusing on the degeneracies of energy bands serving as the singularities in the momentum space, attract much attention. Especially in the three-dimension, various topological semimetals have been proposed. With unit topological charge ±1, Weyl degeneracies have laid the foundation. Also, they show loads of exotic properties, such as Fermi arcs and chiral anomalies. Being relied on the band topology theory, topological gapless phases have also been transferred into classic systems, such as photonics, acoustics and mechanics. Here, we experimentally investigated photonic Weyl systems in the photonic continuum media, where electromagnetic intrinsic degrees of freedom play key roles in constructing the state space. Firstly, we researched chiral hyperbolic metamaterials, a type-II Weyl metamaterials, from which we directly observed topological surface-state arcs. Then, we report the discovery of ideal photonic Weyl systems, where helicoid structure of nontrivial surface states has been demonstrated. Finally, we construct photonic Dirac points, through analysing eigen reflection field, we found the correlation of topological charges in momentum and real spaces.
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7

Lu, Fuyan. "Topological Phases with Crystalline Symmetries." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1524790822570583.

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8

Lifschytz, Gilad. "Quantum gravity and topological field theory." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/33529.

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9

Tang, Evelyn (Evelyn May Yin). "Topological phases in narrow-band systems." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/103220.

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Анотація:
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 2015.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 64-72).
I discuss several novel topological phases in correlated electron systems, realized through spin-orbit interactions and lattice effects especially narrow-band systems. The first realizes the fractional quantum Hall effect using geometric frustration and ferromagnetism to obtain a nearly flat band with a large bandgap and non-zero Chern number. This system can support this effect at high temperatures upon partial filling of the flat band. The second proposal builds upon this system: as the ground state is a fractional quantum Hall state, excitations of this state are anyons when there is an incommensurate filling. The underlying lattice allows access to a new regime in which the anyon gas can form a charged superfluid, including states with intrinsic topological order or that similar to a BCS-type state. The third proposal studies topological crystalline insulators and strain as an effective gauge field on the surface state Dirac fermions. The zero-energy Landau orbitals form a flat band where the high density of states gives rise to the interface superconductivity observed in IV-VI semiconductor multilayers at high temperatures, with non-BCS behavior. A discussion of superconductivity in flat band systems concludes and is contrasted with classic results for a typical electron gas. This work closely parallels that in references [1, 2, 3].
by Evelyn Tang.
Ph. D.
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10

Wu, Hao. "Excitations in Topological Superfluids and Superconductors." Thesis, Northwestern University, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10259423.

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In this thesis I present the theoretical work on Fermionic surface states, and %the bulk Bosonic collective excitations in topological superfluids and superconductors. Broken symmetries %Bulk-edge correspondence in topological condensed matter systems have implications for the spectrum of Fermionic excitations confined on surfaces or topological defects. (Abstract shortened by ProQuest.)

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Книги з теми "Topological physics"

1

Basu, Saurabh. Topological Phases in Condensed Matter Physics. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-5321-9.

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2

Hollands, Lotte. Topological strings and quantum curves. Amsterdam: Amsterdam University Press, 2009.

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3

Afanasiev, G. N. Topological Effects in Quantum Mechanics. Dordrecht: Springer Netherlands, 1999.

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4

Anne-Christine, Davis, Brandenberger Robert Hans, North Atlantic Treaty Organization. Scientific Affairs Division., and NATO Advanced Study Institute on Formation and Interactions of Topological Defects (1994 : Cambridge, England), eds. Formation and interactions of topological defects. New York: Plenum Press, 1995.

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5

service), SpringerLink (Online, ed. Differentiable Manifolds: A Theoretical Physics Approach. Boston: Springer Science+Business Media, LLC, 2012.

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6

Laboratory, Fermi National Accelerator, and United States. National Aeronautics and Space Administration., eds. The formation of topological defects in phase transitions. Batavia, IL: Fermi National Accelerator Laboratory, 1989.

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7

Giuseppe, Morandi. Quantum Hall effect: Topological problems in condensed-matter physics. Napoli: Bibliopolis, 1988.

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8

Shen, Shun-Qing. Topological Insulators: Dirac Equation in Condensed Matters. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012.

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9

Davis, Anne-Christine. Formation and Interactions of Topological Defects: Proceedings of a NATO Advanced Study Institute on Formation and Interactions of Topological Defects, held August 22-September 2, 1994, in Cambridge, England. Boston, MA: Springer US, 1995.

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10

Grigorʹevich, Barʹi͡a︡khtar Viktor, ed. Dynamics of topological magnetic solitons: Experiment and theory. Berlin: Springer-Verlag, 1994.

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Частини книг з теми "Topological physics"

1

Baus, Marc, and Carlos F. Tejero. "Topological Defects and Topological Phase Transitions." In Equilibrium Statistical Physics, 323–71. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-75432-7_12.

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2

Blanchard, Philippe, and Erwin Brüning. "Topological Aspects." In Mathematical Methods in Physics, 235–45. Boston, MA: Birkhäuser Boston, 2003. http://dx.doi.org/10.1007/978-1-4612-0049-9_18.

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3

Blanchard, Philippe, and Erwin Brüning. "Topological Aspects." In Mathematical Methods in Physics, 265–76. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-14045-2_19.

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4

Monastyrsky, Michael. "Topological Particles." In Riemann, Topology, and Physics, 145–56. Boston, MA: Birkhäuser Boston, 1999. http://dx.doi.org/10.1007/978-0-8176-4779-7_14.

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5

Monastyrsky, Michael. "Topological Structures." In Riemann, Topology, and Physics, 95–106. Boston, MA: Birkhäuser Boston, 1999. http://dx.doi.org/10.1007/978-0-8176-4779-7_9.

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6

Monastyrsky, Michael. "Topological Particles." In Riemann, Topology, and Physics, 125–29. Boston, MA: Birkhäuser Boston, 1987. http://dx.doi.org/10.1007/978-1-4899-3514-4_14.

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Monastyrsky, Michael. "Topological Structures." In Riemann, Topology, and Physics, 76–87. Boston, MA: Birkhäuser Boston, 1987. http://dx.doi.org/10.1007/978-1-4899-3514-4_9.

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Johnson, P. D. "Dirac cones and topological states: topological insulators." In Physics of Solid Surfaces, 523–34. Berlin, Heidelberg: Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-662-53908-8_127.

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Kouneiher, Joseph. "Topological Foundations of Physics." In The Map and the Territory, 245–71. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-72478-2_13.

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Hafezi, Mohammad, and Jacob Taylor. "Topological Physics with Photons." In Quantum Science and Technology, 71–89. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-52025-4_4.

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Тези доповідей конференцій з теми "Topological physics"

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Kriisa, Annika, R. G. Mani, and W. Wegscheider. "Topological Hall insulator." In THE PHYSICS OF SEMICONDUCTORS: Proceedings of the 31st International Conference on the Physics of Semiconductors (ICPS) 2012. AIP, 2013. http://dx.doi.org/10.1063/1.4848352.

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Soljacic, Marin. "AI for photonics and topological physics." In Active Photonic Platforms (APP) 2023, edited by Ganapathi S. Subramania and Stavroula Foteinopoulou. SPIE, 2023. http://dx.doi.org/10.1117/12.2678581.

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3

Amaral, R. L. P. G. "Mappings From Models Presenting Topological Mass Mechanisms to Purely Topological Models." In IX HADRON PHYSICS AND VII RELATIVISTIC ASPECTS OF NUCLEAR PHYSICS: A Joint Meeting on QCD and QCP. AIP, 2004. http://dx.doi.org/10.1063/1.1843610.

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Wang, Jing, Xi Chen, Bang-Fen Zhu, and Shou-Cheng Zhang. "Topological p-n junction." In THE PHYSICS OF SEMICONDUCTORS: Proceedings of the 31st International Conference on the Physics of Semiconductors (ICPS) 2012. AIP, 2013. http://dx.doi.org/10.1063/1.4848348.

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Thiang, Guo Chuan. "T-duality and K-theory: a view from condensed matter physics." In Workshop on Strings, Membranes and Topological Field Theory. WORLD SCIENTIFIC, 2017. http://dx.doi.org/10.1142/9789813144613_0007.

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NIEH, H. T. "A TORSIONAL TOPOLOGICAL INVARIANT." In Statistical Physics, High Energy, Condensed Matter and Mathematical Physics - The Conference in Honor of C. N. Yang'S 85th Birthday. WORLD SCIENTIFIC, 2008. http://dx.doi.org/10.1142/9789812794185_0003.

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Jackiw, R. "Topological structures in QCD at high T." In CAM-94 Physics meeting. AIP, 1995. http://dx.doi.org/10.1063/1.48782.

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Yukalov, V. I. "Topological Coherent Modes in Trapped Bose Gas." In ATOMIC PHYSICS 19: XIX International Conference on Atomic Physics; ICAP 2004. AIP, 2005. http://dx.doi.org/10.1063/1.1928856.

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Iwamoto, Satoshi, and Yasutomo Ota. "Exploiting Photonic Topology in Semiconductor Nanophotonics." In JSAP-Optica Joint Symposia. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/jsapo.2023.19p_a602_1.

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Анотація:
Research on optics from the viewpoint of topology has begun early 19th century [1]. Recently, the concept of topology has opened up new fields not only in condensed matter physics but also optics and photonics. One of them is topological photonics [2,3], which explores and utilizes the topological properties of light in momentum space. Topologically protected edge states of light appear at the boundary of two optical structures having distinct topological properties in their band structures. The topological edge states, as for the electronic counterparts, can robustly guide light even under the presence of structural disorders including sharp bends of the interface. Besides the physical interests, this unique feature suggesting the potential for novel photonics devices robust against fabrication imperfections/structural disorders has been attracting researchers in the field of nanophotonics.
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Koushik, R., Matthias Baenninger, Vijay Narayan, Subroto Mukerjee, Michael Pepper, Ian Farrer, David A. Ritchie, and Arindam Ghosh. "Topological excitations in semiconductor heterostructures." In THE PHYSICS OF SEMICONDUCTORS: Proceedings of the 31st International Conference on the Physics of Semiconductors (ICPS) 2012. AIP, 2013. http://dx.doi.org/10.1063/1.4848387.

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Звіти організацій з теми "Topological physics"

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Guha, Supratik, H. S. Philip Wong, Jean Anne Incorvia, and Srabanti Chowdhury. Future Directions Workshop: Materials, Processes, and R&D Challenges in Microelectronics. Defense Technical Information Center, June 2022. http://dx.doi.org/10.21236/ad1188476.

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Анотація:
Microelectronics is a complex field with ever-evolving technologies and business needs, fueled by decades of continued fundamental materials science and engineering advancement. Decades of dimensional scaling have led to the point where even the name microelectronics inadequately describes the field, as most modern devices operate on the nanometer scale. As we reach physical limits and seek more efficient ways for computing, research in new materials may offer alternative design approaches that involve much more than electron transport e.g. photonics, spintronics, topological materials, and a variety of exotic quasi-particles. New engineering processes and capabilities offer the means to take advantage of new materials designs e.g. 3D integration, atomic scale fabrication processes and metrologies, digital twins for semiconductor processes and microarchitectures. The wide range of potential technological approaches provides both opportunities and challenges. The Materials, Processes, and R and D Challenges in Microelectronics Future Directions workshop was held June 23-24, 2022, at the Basic Research Innovation Collaboration Center in Arlington, VA, to examine these opportunities and challenges. Sponsored by the Basic Research Directorate of the Office of the Under Secretary of Defense for Research and Engineering, it is intended as a resource for the S and T community including the broader federal funding community, federal laboratories, domestic industrial base, and academia.
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Yan, Yujie, and Jerome F. Hajjar. Automated Damage Assessment and Structural Modeling of Bridges with Visual Sensing Technology. Northeastern University, May 2021. http://dx.doi.org/10.17760/d20410114.

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Анотація:
Recent advances in visual sensing technology have gained much attention in the field of bridge inspection and management. Coupled with advanced robotic systems, state-of-the-art visual sensors can be used to obtain accurate documentation of bridges without the need for any special equipment or traffic closure. The captured visual sensor data can be post-processed to gather meaningful information for the bridge structures and hence to support bridge inspection and management. However, state-of-the-practice data postprocessing approaches require substantial manual operations, which can be time-consuming and expensive. The main objective of this study is to develop methods and algorithms to automate the post-processing of the visual sensor data towards the extraction of three main categories of information: 1) object information such as object identity, shapes, and spatial relationships - a novel heuristic-based method is proposed to automate the detection and recognition of main structural elements of steel girder bridges in both terrestrial and unmanned aerial vehicle (UAV)-based laser scanning data. Domain knowledge on the geometric and topological constraints of the structural elements is modeled and utilized as heuristics to guide the search as well as to reject erroneous detection results. 2) structural damage information, such as damage locations and quantities - to support the assessment of damage associated with small deformations, an advanced crack assessment method is proposed to enable automated detection and quantification of concrete cracks in critical structural elements based on UAV-based visual sensor data. In terms of damage associated with large deformations, based on the surface normal-based method proposed in Guldur et al. (2014), a new algorithm is developed to enhance the robustness of damage assessment for structural elements with curved surfaces. 3) three-dimensional volumetric models - the object information extracted from the laser scanning data is exploited to create a complete geometric representation for each structural element. In addition, mesh generation algorithms are developed to automatically convert the geometric representations into conformal all-hexahedron finite element meshes, which can be finally assembled to create a finite element model of the entire bridge. To validate the effectiveness of the developed methods and algorithms, several field data collections have been conducted to collect both the visual sensor data and the physical measurements from experimental specimens and in-service bridges. The data were collected using both terrestrial laser scanners combined with images, and laser scanners and cameras mounted to unmanned aerial vehicles.
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