Counter-propagating charge transport in the quantum Hall effect regime

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,...

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Published inScience (American Association for the Advancement of Science) Vol. 363; no. 6422; pp. 54 - 57
Main Authors Lafont, Fabien, Rosenblatt, Amir, Heiblum, Moty, Umansky, Vladimir
Format Journal Article
LanguageEnglish
Published United States American Association for the Advancement of Science 04.01.2019
The American Association for the Advancement of Science
Subjects
Aluminum gallium arsenides
Charge transport
Current carriers
Electromagnetism
Electron gas
Electrons
Gallium arsenide
Heterostructures
Magnetic fields
Quantum Hall effect
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Summary: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.
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ISSN:0036-8075
1095-9203
1095-9203
DOI:10.1126/science.aar3766