- Quantum-spin-Hall phases and 2D topological insulating states in.
- Proximity-magnetized quantum spin Hall insulator: monolayer 1 T'.
- [cond-mat/0411737] Quantum Spin Hall Effect in Graphene - arX.
- The Quantum Spin Hall Effect: Theory and Experiment.
- Title: Optical bulk-boundary dichotomy in a quantum spin Hall insulator.
- Induced superconductivity in the quantum spin Hall edge.
- Quantum Spin Hall Insulator State in HgTe Quantum Wells - Science.
- (PDF) Room Temperature Quantum Spin Hall Insulator in Ethynyl.
- Postdoctoral Research Associate Cryo-EM Quantum Materials.
- Quantum Anomalous Hall Insulators | Goldhaber-Gordon Group.
- On-demand quantum spin Hall insulators controlled by two.
- Optical bulk-boundary dichotomy in a quantum spin Hall insulator.
- TomonagaLuttinger liquid in the edge channels of a quantum.
- Quantum spin hall insulators in strain-modified arsenene.
Quantum-spin-Hall phases and 2D topological insulating states in.
A quantum spin Hall insulator (QSH), or a two-dimensional topological insulator, possesses an insulating bulk, and topologically protected dissipationless edge states that bridge the energy gap opened by band inversion and strong spin-orbit coupling. A QSH state features quantized Hall conductance in the absence of a magnetic field and is thus.
Proximity-magnetized quantum spin Hall insulator: monolayer 1 T'.
Apr 23, 2021 Among them is the quantum spin Hall (QSH) insulatora 2D state of matter that arises from interplay of topological band inversion and strong spinorbit coupling, with large tunable bulk bandgaps up to 800 meV and gapless, 1D edge states. By means of density functional theory (DFT) computations, we predict that the suitable strain modulation of honeycomb arsenene results in a unique two-dimensional (2D) topological insulator (TI) with a sizable bulk gap (up to 696 meV), which could be characterized and utilized at room temperature.
[cond-mat/0411737] Quantum Spin Hall Effect in Graphene - arX.
Abstract The helical edge states in a quantum spin Hall insulator are presumably protected by time-reversal symmetry. However, even in the presence of magnetic field which breaks time-reversal symmetry, the helical edge conduction can still exist, dubbed as pseudo quantum spin Hall effect.
The Quantum Spin Hall Effect: Theory and Experiment.
Atomically thin topological materials are attracting growing attention for their potential to radically transform classical and quantum electronic device concepts.. Mar 30, 2015 Two-dimensional (2D) topological insulators (TIs), also known as quantum spin Hall (QSH) insulators, are excellent candidates for coherent spin transport related applications because the edge states of 2D TIs are robust against nonmagnetic impurities since the only available backscattering channel is forbidden.
Title: Optical bulk-boundary dichotomy in a quantum spin Hall insulator.
However, the NI to topological insulator (TI) phase transition can be induced by biaxial strain, and a piezoelectric quantum spin Hall insulator (PQSHI) can be achieved. More excitingly, the phase transformation point is only about 1.01 tensile strain, and the nontrivial band topology can hold until the considered 1.16 tensile strain. The research will focus on quantum materials exhibiting insulator-metal-transition, spin-torque-oscillator, or topological properties for novel forms of information storage and manipulation. Position Description The position will provide an exceptional opportunity for research in quantum materials and devices for one or two of the following areas. 1 Ferroelectric Antiferromagnetic Quantum Anomalous Hall Insulator in Two-Dimensional van der Waals Materials Yan Liang1, Fulu Zheng2, Thomas Frauenheim2,3,4,*, Pei Zhao1,* 1 College of Physics and Optoelectronic Engineering, Faculty of Information Science and Engineering, Ocean University of China, Songling Road 238, Qingdao 266100, People's Republic of.
Induced superconductivity in the quantum spin Hall edge.
Figure 1. Spatial separation is at the heart of both the quantum Hall (QH) and the quantum spin Hall (QSH) effects. (a) A spinless one-dimensional system has both a forward and a backward mover. Those two basic. Quantum spin Hall (QSH) insulators feature edge states that topologically protected from backscattering. However, the major obstacles to application for QSH effect are the lack of suitable QSH insulators with a large bulk gap. Based on first-principles calculations, we predict a class of large-gap QSH insulators in ethynyl-derivative functionalized stanene (SnC2X; X = H, F, Cl, Br, I. Here, based on first-principles calculations, we found that a two-dimensional CX 3 (X = Sb, Bi) monolayer is a quantum spin Hall insulator with a large band gap. With the strong spinorbit coupling effect, CX 3 exhibits noticeable bulk band gaps up to 470 meV, sufficiently large for realizing the quantum spin Hall effect at room temperature.
Quantum Spin Hall Insulator State in HgTe Quantum Wells - Science.
By bringing monolayer 1 T' WTe 2, a two-dimensional quantum spin Hall insulator, and few-layer Cr 2 Ge 2 Te 6, an insulating ferromagnet, into close proximity in. I work on formulating a theoretical framework to predict and describe unexplored spin-dependent phenomena in solid-state systems, as well as on proposing spintronic devices that could lead to applications that would be ineffective or not feasible with conventional electronics, from spin lasers and spin transistors to topologically-protected. Fundamental symmetry breaking and relativistic spin-orbit coupling give rise to fascinating phenomena in quantum materials. Of particular interest are the interfaces between ferromagnets and common s-wave superconductors, where the emergent spin-orbit fields support elusive spin-triplet superconductivity, crucial for superconducting spintronics and topologically-protected Majorana bound states.
(PDF) Room Temperature Quantum Spin Hall Insulator in Ethynyl.
The quantum Hall state gives the first, and so far the only example of a topologically non-trivial state of matter, where the quantization of the Hall conductance is protected by a topological invariant. The quantum spin Hall (QSH) insulators (4,5,6) have a similar, but distinct non-trivial topological property. Quantum Anomalous Hall Insulators Topological insulators are materials that insulate in bulk yet feature topologically protected, conductive surface states. These surface states host spin-momentum locked electron states, which are profoundly visible in transport as the bulk of the material is highly resistive. Aug 3, 2017 Abstract We report on a class of quantum spin Hall insulators (QSHIs) in strained-layer InAs/GaInSb quantum wells, in which the bulk gaps are enhanced up to fivefold as compared to the binary InAs/GaSb QSHI.
Postdoctoral Research Associate Cryo-EM Quantum Materials.
The direct approach to obtain a QAH Insulator is to introduce FM order into a quantum spin Hall insulator [20], [21] (also called as a topological Insulator) and break its time-reversal symmetry, thereby turning its helical edge states to chiral ones. Oct 28, 2019 Quantum spin Hall insulators are two-dimensional materials that host conducting helical electron states strictly confined to the one-dimensional boundaries. These edge channels are protected by. Here we present measurements of superconductivity induced in two-dimensional HgTe/HgCdTe quantum wells, a material that becomes a quantum spin Hall insulator when the well width exceeds dC =.
Quantum Anomalous Hall Insulators | Goldhaber-Gordon Group.
In ideal quantum spin Hall insulators (QSHI) 7, 8, 9, 10, 11, 12, 13, 14, on the other hand, the two counter-propagating helical edge currents produce neither Hall nor Nernst signal due. Nov 17, 2021 In a 2D topological insulator, also known as a quantum spin Hall insulator, electrical currents flow only around the edge, are impervious to perturbations, and are helical (electrons moving one way along the edge have the opposite spin to those moving the other way). We study, using non-equilibrium Green’s function simulations combined with first-principles density functional theory, the edge-state transport in two-dimensional topological insulators. We explore the impact of electron–phonon coupling on carrier transport through the protected states of two widely known topological insulators with different bulk gaps, namely stanene and.
On-demand quantum spin Hall insulators controlled by two.
For instance, a quantum spin Hall insulator features a bulk insulating gap with gapless helical boundary states protected by the underlying Z2 topology. However, the bulk-boundary dichotomy and distinction are rarely explored in optical experiments, which can provide unique information about topological charge carriers beyond transport and. The quantum spin Hall state is a state of matter proposed to exist in special, two-dimensional semiconductors that have a quantized spin-Hall conductance and a vanishing charge-Hall conductance. The quantum spin Hall state of matter is the cousin of the integer quantum Hall state, and that does not See more. Oct 31, 2011 Abstract. Topological insulators (quantum spin Hall systems) are insulating in the bulk but have gapless edge/surface states, which remain gapless even when nonmagnetic disorder or interaction is present. This robustness stems from the topological nature characterized by the Z2 topological number, and this offers us various kinds of new novel.
Optical bulk-boundary dichotomy in a quantum spin Hall insulator.
Two-dimensional (2D) ferroelectric quantum spin Hall (FEQSH) insulator, which features coexisting ferroelectric and topologically insulating orders in two.
TomonagaLuttinger liquid in the edge channels of a quantum.
Quantum wells Topological insulator Scanning tunneling spectroscopy Superconductors Spintronic devices Angle-resolved photoemission spectroscopy Nanoparticles Graphene ABSTRACT The quantum-spin-Hall (QSH) phase and its helical edge spins of two-dimensional (2D) topological insulators (TIs) are attracting increasing attention. Jan 11, 2010 In topological insulators, spin-orbit coupling and time-reversal symmetry combine to form a novel state of matter predicted to have exotic physical properties. 7 pages, 5 figures, an introduction of the quantum spin Hall effect and topological insulators. For a video introduction of topological insulators, see this URL.
Quantum spin hall insulators in strain-modified arsenene.
For instance, a quantum spin Hall insulator features a bulk insulating gap with gapless helical boundary states protected by the underlying Z2 topology. However, the.