scholarly journals Quantum Hall stripes in high-density GaAs/AlGaAs quantum wells

2018 ◽  
Vol 98 (20) ◽  
Author(s):  
X. Fu ◽  
Q. Shi ◽  
M. A. Zudov ◽  
Y. J. Chung ◽  
K. W. Baldwin ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Quantum Hall ◽  
High Density

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.

scholarly journals Quantum Hall Ferromagnetic-Paramagnetic Transition in p-Si/SiGe/Si Quantum Wells in a Tilted Magnetic Field

2012 ◽  
Vol 400 (4) ◽  
pp. 042005 ◽  
Author(s):  
I L Drichko ◽  
I Yu Smirnov ◽  
A V Suslov ◽  
O A Mironov ◽  
D R Leadley
Keyword(s):  
Magnetic Field ◽  
Quantum Wells ◽  
Quantum Hall ◽  
Tilted Magnetic Field

Enhanced electron mobility and high order fractional quantum Hall states in AlAs quantum wells

2002 ◽  
Vol 80 (9) ◽  
pp. 1583-1585 ◽  
Author(s):  
E. P. De Poortere ◽  
Y. P. Shkolnikov ◽  
E. Tutuc ◽  
S. J. Papadakis ◽  
M. Shayegan ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Electron Mobility ◽  
Quantum Hall ◽  
High Order ◽  
Fractional Quantum ◽  
Fractional Quantum Hall ◽  
Quantum Hall States ◽  
Hall States

Quantum hall effect in a system of gapless Dirac fermions in HgTe quantum wells

JETP Letters ◽  
2015 ◽  
Vol 100 (11) ◽  
pp. 724-730 ◽  
Author(s):  
D. A. Kozlov ◽  
Z. D. Kvon ◽  
N. N. Mikhailov ◽  
S. A. Dvoretskii
Keyword(s):  
Quantum Wells ◽  
Hall Effect ◽  
Quantum Hall Effect ◽  
Quantum Hall ◽  
Dirac Fermions

Quantum Hall effect in HgTe quantum wells at nitrogen temperatures

2014 ◽  
Vol 105 (13) ◽  
pp. 132102 ◽  
Author(s):  
D. A. Kozlov ◽  
Z. D. Kvon ◽  
N. N. Mikhailov ◽  
S. A. Dvoretskii ◽  
S. Weishäupl ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Hall Effect ◽  
Quantum Hall Effect ◽  
Quantum Hall

scholarly journals Hidden Quantum Hall Stripes in AlxGa1−xAs/Al0.24Ga0.76As Quantum Wells

2020 ◽  
Vol 125 (23) ◽  
Author(s):  
X. Fu ◽  
Yi Huang ◽  
Q. Shi ◽  
B. I. Shklovskii ◽  
M. A. Zudov ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Quantum Hall

scholarly journals HgTe quantum wells with inverted band structure: Quantum Hall effect and the large-scale impurity potential

2019 ◽  
Vol 45 (4) ◽  
pp. 412-418 ◽  
Author(s):  
S. V. Gudina ◽  
Yu. G. Arapov ◽  
V. N. Neverov ◽  
S. M. Podgornykh ◽  
M. R. Popov ◽  
...  
Keyword(s):  
Band Structure ◽  
Quantum Wells ◽  
Hall Effect ◽  
Quantum Hall Effect ◽  
Large Scale ◽  
Quantum Hall ◽  
Impurity Potential

scholarly journals Quantum Hall states in inverted HgTe quantum wells probed by transconductance fluctuations

2020 ◽  
Vol 102 (7) ◽  
Author(s):  
S. Mantion ◽  
C. Avogadri ◽  
S. S. Krishtopenko ◽  
S. Gebert ◽  
S. Ruffenach ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Quantum Hall ◽  
Quantum Hall States ◽  
Hall States

OBSERVATIONS OF PARALLEL FIELD INDUCED REENTRANT QUANTUM HALL EFFECTS IN WIDE GaAs QUANTUM WELLS

2009 ◽  
Vol 23 (12n13) ◽  
pp. 2808-2812
Author(s):  
D. R. LUHMAN ◽  
W. PAN ◽  
T. M. LU ◽  
D. C. TSUI ◽  
L. N. PFEIFFER ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Quantum Wells ◽  
Field Experiments ◽  
Quantum Hall ◽  
Particle Energy ◽  
Level Crossing ◽  
Quantum Hall States ◽  
Parallel Field ◽  
Hall Effects ◽  
Tilted Magnetic Field

We report the results of tilted magnetic field experiments on three high quality wide GaAs quantum wells, with particular emphasis on the N ≥ 1 Landau levels. With an increasing component of in-plane magnetic field, B∥, we observe reentrant behavior for the odd filling factor quantum Hall states. This reentrance is not explained within a single-particle energy level crossing scheme and may be related to the collapse of interlayer tunneling.

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