A comparison study between acoustic topological states based on valley Hall and quantum spin Hall effects

2019 ◽  
Vol 146 (1) ◽  
pp. 721-728 ◽  
Author(s):  
Yuanchen Deng ◽  
Minghui Lu ◽  
Yun Jing
Keyword(s):  
Quantum Spin ◽  
Comparison Study ◽  
Hall Effects ◽  
Topological States ◽  
Spin Hall Effects ◽  
Quantum Spin Hall

scholarly journals Spin transistor and quantum spin Hall-effects in CdBxF2−x–p-CdF2–CdBxF2−x sandwich nanostructures

2010 ◽  
Vol 470 (19) ◽  
pp. 893-896 ◽  
Author(s):  
N.T. Bagraev ◽  
O.N. Guimbitskaya ◽  
L.E. Klyachkin ◽  
A.A. Kudryavtsev ◽  
A.M. Malyarenko ◽  
...  
Keyword(s):  
Quantum Spin ◽  
Hall Effects ◽  
Spin Transistor ◽  
Spin Hall Effects ◽  
Quantum Spin Hall

scholarly journals Emergent quantum Hall effects below 50 mT in a two-dimensional topological insulator

2020 ◽  
Vol 6 (26) ◽  
pp. eaba4625
Author(s):  
Saquib Shamim ◽  
Wouter Beugeling ◽  
Jan Böttcher ◽  
Pragya Shekhar ◽  
Andreas Budewitz ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Quantum Hall ◽  
Quantum Spin ◽  
Majorana Fermions ◽  
Quantum Spin Hall Effect ◽  
Topological Materials ◽  
Quantum Hall Effects ◽  
Hall Effects ◽  
Low Magnetic Field ◽  
Quantum Spin Hall

The realization of the quantum spin Hall effect in HgTe quantum wells has led to the development of topological materials, which, in combination with magnetism and superconductivity, are predicted to host chiral Majorana fermions. However, the large magnetization in conventional quantum anomalous Hall systems makes it challenging to induce superconductivity. Here, we report two different emergent quantum Hall effects in (Hg,Mn)Te quantum wells. First, a previously unidentified quantum Hall state emerges from the quantum spin Hall state at an exceptionally low magnetic field of ~50 mT. Second, tuning toward the bulk p-regime, we resolve quantum Hall plateaus at fields as low as 20 to 30 mT, where transport is dominated by a van Hove singularity in the valence band. These emergent quantum Hall phenomena rely critically on the topological band structure of HgTe, and their occurrence at very low fields makes them an ideal candidate for realizing chiral Majorana fermions.

New topological states in HgTe quantum wells from defect patterning

Nanoscale ◽  
2018 ◽  
Vol 10 (33) ◽  
pp. 15462-15467
Author(s):  
Hua-Hua Fu ◽  
Ruqian Wu
Keyword(s):  
Quantum Wells ◽  
2D Materials ◽  
Quantum Spin ◽  
Two Dimensional ◽  
New Methods ◽  
Topological States ◽  
Quantum Spin Hall

To explore new methods for the realization of the quantum spin Hall (QSH) effect in two-dimensional (2D) materials, we have constructed a honeycomb geometry (HG) by etching rows of hexagonal holes in HgTe quantum wells (QWs).

scholarly journals Spin-textured Chern bands in AB-stacked transition metal dichalcogenide bilayers

2021 ◽  
Vol 118 (36) ◽  
pp. e2112673118
Author(s):  
Yang Zhang ◽  
Trithep Devakul ◽  
Liang Fu
Keyword(s):  
Transition Metal ◽  
Displacement Field ◽  
Anomalous Hall Effect ◽  
Quantum Spin ◽  
Transition Metal Dichalcogenide ◽  
First Principle ◽  
First Principle Calculations ◽  
Hall Effects ◽  
Topological States ◽  
Spin Texture

While transition-metal dichalcogenide (TMD)–based moiré materials have been shown to host various correlated electronic phenomena, topological states have not been experimentally observed until now [T. Li et al., Quantum anomalous Hall effect from intertwined moiré bands. arXiv [Preprint] (2021). https://arxiv.org/abs/2107.01796 (Accessed 5 July 2021)]. In this work, using first-principle calculations and continuum modeling, we reveal the displacement field–induced topological moiré bands in AB-stacked TMD heterobilayer MoTe2/WSe2. Valley-contrasting Chern bands with nontrivial spin texture are formed from interlayer hybridization between MoTe2 and WSe2 bands of nominally opposite spins. Our study establishes a recipe for creating topological bands in AB-stacked TMD bilayers in general, which provides a highly tunable platform for realizing quantum-spin Hall and interaction-induced quantum anomalous Hall effects.

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