scholarly journals Electron-hole pairing in topological insulator heterostructures in the quantum Hall state

2013 ◽  
Vol 87 (11) ◽  
Author(s):  
K. V. Germash ◽  
D. V. Fil
Keyword(s):  
Topological Insulator ◽  
Quantum Hall ◽  
Electron Hole ◽  
Quantum Hall State

scholarly journals Chemical potential and quantum Hall ferromagnetism in bilayer graphene

Science ◽  
2014 ◽  
Vol 345 (6192) ◽  
pp. 58-61 ◽  
Author(s):  
Kayoung Lee ◽  
Babak Fallahazad ◽  
Jiamin Xue ◽  
David C. Dillen ◽  
Kyounghwan Kim ◽  
...  
Keyword(s):  
Degrees Of Freedom ◽  
Chemical Potential ◽  
Hexagonal Boron Nitride ◽  
Quantum Hall ◽  
Bilayer Graphene ◽  
Zero Magnetic Field ◽  
High Magnetic Fields ◽  
Complex Interplay ◽  
Electron Hole ◽  
Quantum Hall State

Bilayer graphene has a distinctive electronic structure influenced by a complex interplay between various degrees of freedom. We probed its chemical potential using double bilayer graphene heterostructures, separated by a hexagonal boron nitride dielectric. The chemical potential has a nonlinear carrier density dependence and bears signatures of electron-electron interactions. The data allowed a direct measurement of the electric field–induced bandgap at zero magnetic field, the orbital Landau level (LL) energies, and the broken-symmetry quantum Hall state gaps at high magnetic fields. We observe spin-to-valley polarized transitions for all half-filled LLs, as well as emerging phases at filling factors ν = 0 and ν = ±2. Furthermore, the data reveal interaction-driven negative compressibility and electron-hole asymmetry in N = 0, 1 LLs.

scholarly journals Controllable quantum point junction on the surface of an antiferromagnetic topological insulator

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Nicodemos Varnava ◽  
Justin H. Wilson ◽  
J. H. Pixley ◽  
David Vanderbilt
Keyword(s):  
Topological Insulator ◽  
Information Science ◽  
Domain Walls ◽  
Quantum Hall ◽  
Edge State ◽  
Wave Functions ◽  
Quantum Hall Systems ◽  
Electron Quantum ◽  
Quantum Point ◽  
Higher Temperature

AbstractEngineering and manipulation of unidirectional channels has been achieved in quantum Hall systems, leading to the construction of electron interferometers and proposals for low-power electronics and quantum information science applications. However, to fully control the mixing and interference of edge-state wave functions, one needs stable and tunable junctions. Encouraged by recent material candidates, here we propose to achieve this using an antiferromagnetic topological insulator that supports two distinct types of gapless unidirectional channels, one from antiferromagnetic domain walls and the other from single-height steps. Their distinct geometric nature allows them to intersect robustly to form quantum point junctions, which then enables their control by magnetic and electrostatic local probes. We show how the existence of stable and tunable junctions, the intrinsic magnetism and the potential for higher-temperature performance make antiferromagnetic topological insulators a promising platform for electron quantum optics and microelectronic applications.

scholarly journals Phase transition and anomalous scaling in the quantum Hall transport of topological-insulator Sn−Bi1.1Sb0.9Te2S devices

2019 ◽  
Vol 99 (8) ◽  
Author(s):  
Faji Xie ◽  
Shuai Zhang ◽  
Qianqian Liu ◽  
Chuanying Xi ◽  
Ting-Ting Kang ◽  
...  
Keyword(s):  
Phase Transition ◽  
Topological Insulator ◽  
Quantum Hall ◽  
Anomalous Scaling

scholarly journals Probing Quantum Hall State Homogeneity with Surface Waves

2013 ◽  
Vol 456 ◽  
pp. 012030 ◽  
Author(s):  
M E Msall ◽  
W Dietsche ◽  
S Schmult ◽  
K von Klitzing
Keyword(s):  
Surface Waves ◽  
Quantum Hall ◽  
Quantum Hall State

scholarly journals A Chern-Simons effective field theory for the Pfaffian quantum Hall state

1998 ◽  
Vol 516 (3) ◽  
pp. 704-718 ◽  
Author(s):  
Eduardo Fradkin ◽  
Chetan Nayak ◽  
Alexei Tsvelik ◽  
Frank Wilczek
Keyword(s):  
Field Theory ◽  
Effective Field Theory ◽  
Quantum Hall ◽  
Effective Field ◽  
Chern Simons ◽  
Quantum Hall State

Universality test of the quantum Hall effect on topological insulator

2016 ◽  
Author(s):  
Tetsuro Misawa ◽  
Yasuhiro Fukuyama ◽  
Yuma Okazaki ◽  
Shuji Nakamura ◽  
Nariaki Nasaka ◽  
...  
Keyword(s):  
Hall Effect ◽  
Quantum Hall Effect ◽  
Topological Insulator ◽  
Quantum Hall

Spin and Charge Density Excitations and the Collapse of the Fractional Quantum Hall State atν=1/3

1997 ◽  
Vol 78 (21) ◽  
pp. 4095-4098 ◽  
Author(s):  
H. D. M. Davies ◽  
J. C. Harris ◽  
J. F. Ryan ◽  
A. J. Turberfield
Keyword(s):  
Charge Density ◽  
Quantum Hall ◽  
Fractional Quantum ◽  
Fractional Quantum Hall ◽  
Quantum Hall State
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