Inter-edge-state scattering in the spin-polarized quantum Hall regime with current injection into inner states

1994 ◽  
Vol 50 (7) ◽  
pp. 4456-4462 ◽  
Author(s):  
Y. Takagaki ◽  
K. J. Friedland ◽  
J. Herfort ◽  
H. Kostial ◽  
K. Ploog
Keyword(s):  
Quantum Hall ◽  
Edge State ◽  
Current Injection ◽  
Quantum Hall Regime ◽  
Hall Regime ◽  
Spin Polarized

scholarly journals Counter-propagating charge transport in the quantum Hall effect regime

Science ◽  
2019 ◽  
Vol 363 (6422) ◽  
pp. 54-57 ◽  
Author(s):  
Fabien Lafont ◽  
Amir Rosenblatt ◽  
Moty Heiblum ◽  
Vladimir Umansky
Keyword(s):  
Hall Effect ◽  
Quantum Hall Effect ◽  
Electron Gas ◽  
Quantum Hall ◽  
Charge Carriers ◽  
Perpendicular Magnetic Field ◽  
Quantum Hall Regime ◽  
Hall Regime ◽  
Spin Polarized ◽  
Conjugate States

The quantum Hall effect, observed in a two-dimensional (2D) electron gas subjected to a perpendicular magnetic field, imposes a 1D-like chiral, downstream, transport of charge carriers along the sample edges. Although this picture remains valid for electrons and Laughlin’s fractional quasiparticles, it no longer holds for quasiparticles in the so-called hole-conjugate states. These states are expected, when disorder and interactions are weak, to harbor upstream charge modes. However, so far, charge currents were observed to flow exclusively downstream in the quantum Hall regime. Studying the canonical spin-polarized and spin-unpolarized v = 2/3 hole-like states in GaAs-AlGaAs heterostructures, we observed a significant upstream charge current at short propagation distances in the spin unpolarized state.

Edge-state transport in graphenep−njunctions in the quantum Hall regime

2015 ◽  
Vol 92 (24) ◽  
Author(s):  
Nikolai N. Klimov ◽  
Son T. Le ◽  
J. Yan ◽  
Pratik Agnihotri ◽  
Everett Comfort ◽  
...  
Keyword(s):  
Quantum Hall ◽  
Edge State ◽  
Quantum Hall Regime ◽  
Hall Regime

Comparisons of edge state versus bulk conduction in the quantum Hall regime

1990 ◽  
Vol 229 (1-3) ◽  
pp. 37-39 ◽  
Author(s):  
D.A. Syphers ◽  
J.H. Killoran ◽  
H.E. Brakewood ◽  
F. Reis ◽  
P.J. Stiles
Keyword(s):  
Quantum Hall ◽  
Edge State ◽  
Quantum Hall Regime ◽  
Hall Regime

scholarly journals Supercurrent in Graphene Josephson Junctions with Narrow Trenches in the Quantum Hall Regime

MRS Advances ◽  
2018 ◽  
Vol 3 (47-48) ◽  
pp. 2855-2864 ◽  
Author(s):  
Andrew Seredinski ◽  
Anne Draelos ◽  
Ming-Tso Wei ◽  
Chung-Ting Ke ◽  
Tate Fleming ◽  
...  
Keyword(s):  
Josephson Junctions ◽  
Applied Field ◽  
Quantum Hall ◽  
Edge State ◽  
Edge States ◽  
Hole Edge ◽  
Low Field ◽  
Quantum Hall Regime ◽  
Hall Regime ◽  
The Subject

ABSTRACTCoupling superconductors to quantum Hall edge states is the subject of intense investigation as part of the ongoing search for non-abelian excitations. Our group has previously observed supercurrents of hundreds of picoamperes in graphene Josephson junctions in the quantum Hall regime. One of the explanations of this phenomenon involves the coupling of an electron edge state on one side of the junction to a hole edge state on the opposite side. In our previous samples, these states are separated by several microns. Here, a narrow trench perpendicular to the contacts creates counterpropagating quantum Hall edge channels tens of nanometres from each other. Transport measurements demonstrate a change in the low-field Fraunhofer interference pattern for trench devices and show a supercurrent in both trench and reference junctions in the quantum Hall regime. The trench junctions show no enhancement of quantum Hall supercurrent and an unexpected supercurrent periodicity with applied field, suggesting the need for further optimization of device parameters.

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