Linear Electrodynamic Response Of Topological Semimetals
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Linear Electrodynamic Response Of Topological Semimetals
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Author : Artem V. Pronin
language : en
Publisher: Springer Nature
Release Date : 2023-08-17
Linear Electrodynamic Response Of Topological Semimetals written by Artem V. Pronin and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-08-17 with Technology & Engineering categories.
This book provides a model description for the electromagnetic response of topological nodal semimetals and summarizes recent experimental findings in these systems. Specifically, it discusses various types of topological semimetals – Dirac, Weyl, nodal-line, triple-point, and multifold semimetals – and provides description for the characteristic features of the linear electrodynamic response for all these types of materials. Topological semimetals possess peculiar bulk electronic band structure, which leads to unusual electrodynamic response. For example, the low-energy inter-band optical conductivity of nodal semimetals is supposed to demonstrate power-law frequency dependence and the intra- and inter-band contributions to the conductivity are often mixed. Further, the magneto-optical response is also unusual, because of the non-equidistant spacing between the Landau levels. Finally, in semimetals with chiral electronic bands, e.g. in Weyl semimetals, the simultaneous application of parallel magnetic and electric fields leads to the chiral anomaly, i.e. to a misbalance between the electrons with diffident chiralities. This misbalance affects the electrodynamics properties of the material and can be detected optically. All these points are addressed here in detail. The book is written for a wide audience of physicists, working in the field of topological condensed matter physics. It gives a pedagogical introduction enabling graduate students and non-experts to familiarize themselves with the subject.
Linear And Nonlinear Electromagnetic Responses In Topological Semimetals
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Author : Shudan Zhong
language : en
Publisher:
Release Date : 2018
Linear And Nonlinear Electromagnetic Responses In Topological Semimetals written by Shudan Zhong and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
Topological Semimetals
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Author : David J. Fisher
language : en
Publisher: Materials Research Forum LLC
Release Date : 2019-04-20
Topological Semimetals written by David J. Fisher and has been published by Materials Research Forum LLC this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-04-20 with Technology & Engineering categories.
Topological semimetals are quantum materials that are not only extremely interesting from a theoretical point of view but also have a great potential for technological applications in which superconducting, semiconducting and other semimetal behaviors are involved. Keywords: Quantum Materials, Macroscopic Quantum Phenomena, Topological Semimetals, Dirac Semimetals, Weyl Semimetals, Nodal-Line Semimetals, Antimony and Antimonides, Antimonene, Arsenides, Bismuthides, Boron, Borides, Borophene, Carbon and Carbides, Chalcogenides, Nitrides, Phosphorus, Phosphides, Silicides, Topological Metals, Topological States of Matter.
Investigation Of Electronic And Magnetic Responses In Topological Semimetals
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Author : Sukriti Singh
language : en
Publisher:
Release Date : 2022*
Investigation Of Electronic And Magnetic Responses In Topological Semimetals written by Sukriti Singh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022* with categories.
Uniaxial Stress Response Electron Phonon Interaction And Magnetic Interactions In Topological Semimetals And Narrow Gap Semiconductors
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Author : Clemens Schindler
language : en
Publisher:
Release Date : 2021
Uniaxial Stress Response Electron Phonon Interaction And Magnetic Interactions In Topological Semimetals And Narrow Gap Semiconductors written by Clemens Schindler and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
A Transport And Optical Study On Topological Semimetals And 2d Materials
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Author : Wenkai Zheng
language : en
Publisher:
Release Date : 2022
A Transport And Optical Study On Topological Semimetals And 2d Materials written by Wenkai Zheng and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with Physics categories.
This thesis is mainly focus on the 3D topological semimetal and 2D materials. If you ask a physicist to name the most significant discovery in solid-state physics over the recent 50 years, and highly likely, if not high-temperature superconductivity, will be topological materials or 2D materials. The study of them has profoundly impacted our understanding of the solid-state system, as recognized by four Nobel prizes. Chapter 1 is a brief introduction of topological semimetal and 2D materials. Chapter 2 focuses on a quantum oscillatory study on the Dirac type-II semimetallic candidates PdTe2 and PtTe2. In high-quality single crystals of both compounds, id est displaying carrier mobilities between 10^3 and 10^4 cm2/Vs, we observed a large non-saturating magnetoresistivity (MR) which in PtTe2 at a temperature T = 1.3 K, leads to an increase in the resistivity up to 5*10^4% under a magnetic field [mu]0H = 62 T. These high mobilities correlate with their light effective masses in the range of 0.04 to 1 bare electron mass according to our measurements. For PdTe2 the experimentally determined Fermi surface cross-sectional areas show an excellent agreement with those resulting from band-structure calculations. Surprisingly, this is not the case for PtTe2 whose agreement between calculations and experiments is relatively poor even when electronic correlations are included in the calculations. Therefore, our study provides a strong support for the existence of a Dirac type-II node in PdTe2 and probably also for PtTe2. Band structure calculations indicate that the topologically non-trivial bands of PtTe2 do not cross the Fermi-level ([epsilon]F). In contrast, for PdTe2 the Dirac type-II cone does intersect [epsilon]F , although our calculations also indicate that the associated cyclotron orbit on the Fermi surface is located in a distinct kz plane with respect to the one of the Dirac type-II node. Therefore it should yield a trivial Berry-phase. Chapter 3 presents a study on the Fermi-surface of the Dirac type-II semi-metallic candidate NiTe2. In contrast to its isostructural compounds like PtSe2, band structure calculations predict NiTe2 to display a tilted Dirac node very close to its Fermi level that is located along the [gamma] to A high symmetry direction within its first Brillouin zone (FBZ). The angular dependence of the dHvA frequencies is found to be in agreement with the first-principle calculations when the electronicbands are slightly shifted with respect to the Fermi level ([epsilon]F ), and therefore provide support for the existence of a Dirac type-II node in NiTe2. Nevertheless, we observed mild disagreements between experimental observations and density Functional theory calculations as, for example, nearly isotropic and light experimental effective masses. This indicates that the dispersion of the bands is not well captured by DFT. Despite the coexistence of Dirac-like fermions with topologically trivial carriers, samples of the highest quality display an anomalous and large, either linear or sublinear magnetoresistivity. This suggests that Lorentz invariance breaking Dirac-like quasiparticles dominate the carrier transport in this compound. Chapter 4 describes a study on a 2D superconductor. The superconducting [alpha]-phase thin molybdenum carbide flakes were first synthesized, and a subsequent sulfurization treatment induced the formation of vertical heterolayer systems consisting of different phases of molybdenum carbide- ranging from [alpha] to [gamma]' and [gamma] phases-in conjunction with molybdenum sulfide layers. These transition-metal carbide/disulfide heterostructures exhibited critical superconducting temperatures as high as 6 K, higher than that of the starting single-phased [alpha]-Mo2C (4 K). We analyzed possible interface configurations to explain the observed moire patterns resulting from the vertical heterostacks. Our density-functional theory (DFT) calculations indicate that epitaxial strain and moire patterns lead to a higher interfacial density of states, which favors superconductivity. Suchengineered heterostructures might allow the coupling of superconductivity to the topologically nontrivial surface states featured by transition-metal carbide phases composing these heterostructures potentially leading to unconventional superconductivity. Moreover, we envisage that our approach could also be generalized to other metal carbide and nitride systems that could exhibit high-temperature superconductivity. In chapter 5, We introduce a new moire system: InSe/GaSe hetero-structure. To date, the moire physics has been constrained mainly by two factors i) the dimensionality, defined by the stacking of monolayers, and ii) the twist angle [phi] which unveils novel phases only at quite precise values (e.g. superconductivity, orbital magnetism, correlated insulator states). Here, we overcome these practical limitations through a new class of heterostructures composed of strongly coupled layers of [gamma]-InSe on [epsilon]-GaSe revealing compelling evidence for the moire potential even in thick stacked layers and at arbitrary values of [phi]. We detect a pronounced interlayer exciton (Xi) of very small radius according to the Stark effect, that is composed of several superimposed emissions uniformly spaced in energy [delta]E displaying a pronounced [phi]-dependence. In the interfacial area, similar behavior is also shown by the intralayer exciton of GaSe (X0(Ga)). The strong correlation between [phi] and [delta]Eimplies localization of excitations at the moire potential minima. In contrast to transition metal dichalcogenides (TMDs), the moire potential modulates the multi-component Xi over the entire range of [phi] due to their direct band-gap at the center of the Brillouin zone. Therefore, [gamma]-InSe/[epsilon]-GaSe interfaces offer an unprecedented level of moire exciton tunability not yet achieved in other vans der Waals heterostructures. Our results unveil clear pathways for quantum optoelectronics while offering opportunities to study electronic correlations over a broad range of moire periodicities and layer thicknesses.
Topological Semimetals
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Author : Michael Hook
language : en
Publisher:
Release Date : 2012
Topological Semimetals written by Michael Hook and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
This thesis describes two topological phases of matter, the Weyl semimetal and the line node semimetal, that are related to but distinct from topological insulator phases. These new topological phases are semimetallic, having electronic energy bands that touch at discrete points or along a continuous curve in momentum space. These states are achieved by breaking time-reversal symmetry near a transition between an ordinary insulator and a topological insulator, using a model based on alternating layers of topological and ordinary insulators, which can be tuned close to the transition by choosing the thicknesses of the layers. The semimetallic phases are topologically protected, with corresponding topological surface states, but the protection is due to separation of the band-touching points in momentum space and discrete symmetries, rather than being protected by an energy gap as in topological insulators. The chiral surface states of the Weyl semimetal give it a non-zero Hall conductivity, while the surface states of the line node semimetal have a flat energy dispersion in the region bounded by the line node. Some transport properties are derived, with a particular emphasis on the behaviour of the conductivity as a function of the impurity concentrations and the temperature.
In Search Of Extraordinary Hall Effects In Topological Semimetals
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Author : Shuo-Ying Yang
language : en
Publisher:
Release Date : 2020*
In Search Of Extraordinary Hall Effects In Topological Semimetals written by Shuo-Ying Yang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020* with categories.
Topology, Dirac semimetal, Weyl semimetal, Anomalous Hall Effect (AHE), Planar Hall Effect (PHE), Berry curvature.
Electronic Structure Of Topological Semimetals
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Author : Erik Haubold
language : en
Publisher:
Release Date : 2019
Electronic Structure Of Topological Semimetals written by Erik Haubold and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
Electronic Properties Of Dirac And Weyl Semimetals
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Author : Eduard V. Gorbar
language : en
Publisher: World Scientific Publishing Company
Release Date : 2021-01-14
Electronic Properties Of Dirac And Weyl Semimetals written by Eduard V. Gorbar and has been published by World Scientific Publishing Company this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-01-14 with Science categories.
The monograph reviews various aspects of electronic properties of Dirac and Weyl semimetals. After a brief discussion of 2D Dirac semimetals, a comprehensive review of 3D materials is given. The description starts from an overview of the topological properties and symmetries of Dirac and Weyl semimetals. In addition, several low-energy models of Dirac and Weyl quasiparticles are presented. The key ab initio approaches and material realizations are given. The monograph includes detailed discussions of the surface Fermi arcs, anomalous transport properties, and collective modes of Dirac and Weyl semimetals. Superconductivity in these materials is briefly addressed.