Spin-Selective Equilibration among Integer Quantum Hall Edge Channels
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Date
2022-02-04
Publication Type
Journal Article
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Abstract
The equilibration between quantum Hall edge modes is known to depend on the disorder potential and the steepness of the edge. Modern samples with higher mobilities and setups with lower electron temperatures call for a further exploration of the topic. We develop a framework to systematically measure and analyze the equilibration of many (up to 8) integer edge modes. Our results show that spin-selective coupling dominates even for non-neighboring channels with parallel spin. Changes in magnetic field and bulk density let us control the equilibration until it is almost completely suppressed and dominated only by individual microscopic scatterers. This method could serve as a guideline to investigate and design improved devices, and to study fractional and other exotic states.
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published
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Journal / series
Volume
128 (5)
Pages / Article No.
56802
Publisher
American Physical Society
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Subject
Edge states; Electron relaxation; Integer quantum Hall effect; III-V semiconductors; Two-dimensional electron gas; Dilution refrigerator; Hall bar; Landauer formula
Organisational unit
03439 - Ensslin, Klaus / Ensslin, Klaus
08835 - Ihn, Thomas (Tit.-Prof.)
03833 - Wegscheider, Werner / Wegscheider, Werner
02205 - FIRST-Lab / FIRST Center for Micro- and Nanoscience