scholarly journals Nontrivial interplay of strong disorder and interactions in quantum spin-Hall insulators doped with dilute magnetic impurities

2018 ◽  
Vol 97 (23) ◽  
Author(s):  
Jun-Hui Zheng ◽  
Miguel A. Cazalilla
Keyword(s):  
Quantum Spin ◽  
Magnetic Impurities ◽  
Strong Disorder ◽  
Quantum Spin Hall

scholarly journals Quantized spin Hall conductance in a magnetically doped two dimensional topological insulator

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Saquib Shamim ◽  
Wouter Beugeling ◽  
Pragya Shekhar ◽  
Kalle Bendias ◽  
Lukas Lunczer ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Hall Effect ◽  
Quantum Spin ◽  
Spin Hall Effect ◽  
Zero Magnetic Field ◽  
Hall Resistance ◽  
Magnetic Impurities ◽  
Quantum Spin Hall Effect ◽  
Magnetically Doped ◽  
Quantum Spin Hall

AbstractSoon after the discovery of the quantum spin Hall effect, it has been predicted that a magnetic impurity in the presence of strong Coulomb interactions will destroy the quantum spin Hall effect. However, the fate of the quantum spin Hall effect in the presence of magnetic impurities has not yet been experimentally investigated. Here, we report the successful experimental demonstration of a quantized spin Hall resistance in HgTe quantum wells dilutely alloyed with magnetic Mn atoms. These quantum wells exhibit an inverted band structure that is very similar to that of the undoped material. Micron sized devices of (Hg,Mn)Te quantum well (in the topological phase) show a quantized spin Hall resistance of h/2e2 at low temperatures and zero magnetic field. At finite temperatures, we observe signatures of the Kondo effect due to interaction between the helical edge channels and magnetic impurities. Our work lays the foundation for future investigations of magnetically doped quantum spin Hall materials towards the realization of chiral Majorana fermions.

A New Type of Large‐Gap Quantum Spin Hall Insulator Material ZrSe 5

2021 ◽  
Author(s):  
Xing Wang ◽  
Wenhui Wan ◽  
Yanfeng Ge ◽  
Jun Li ◽  
Yong Liu
Keyword(s):  
Quantum Spin ◽  
New Type ◽  
Quantum Spin Hall

scholarly journals Doping-Induced Quantum Spin Hall Insulator to Superconductor Transition

2021 ◽  
Vol 126 (20) ◽  
Author(s):  
Zhenjiu Wang ◽  
Yuhai Liu ◽  
Toshihiro Sato ◽  
Martin Hohenadler ◽  
Chong Wang ◽  
...  
Keyword(s):  
Quantum Spin ◽  
Quantum Spin Hall

scholarly journals Signature of Large-Gap Quantum Spin Hall State in the Layered Mineral Jacutingaite

Nano Letters ◽  
2020 ◽  
Vol 20 (7) ◽  
pp. 5207-5213 ◽  
Author(s):  
Konrád Kandrai ◽  
Péter Vancsó ◽  
Gergő Kukucska ◽  
János Koltai ◽  
György Baranka ◽  
...  
Keyword(s):  
Quantum Spin ◽  
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.

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