Counter-propagating charge transport in the quantum Hall effect regime

2018/08/17 by Fabien Lafont, Amir Rosenblatt, Moty Heiblum +1
Physics and Astronomy · #Charge (physics) #Electron #Fractional quantum Hall effect #Landau quantization #Magnetic field #Quantum Hall effect #Quantum and electron transport phenomena #Quantum spin Hall effect #Quasiparticle #Semiconductor Quantum Structures and Devices #Spin (aerodynamics) #Topological Materials and Phenomena #cond-mat.mes-hall

paper · pdf · doi:10.1126/science.aar3766

arxiv created 2018/08/17 · openalex created_date 2018/08/22 · openalex publication_date 2019/01/04 · arxiv updated 2019/03/06 · openalex updated_date 2026/08/05

Abstract

A backward current Two-dimensional materials in a magnetic field can exhibit the so-called quantum Hall effect. This regime is characterized by currents running along the edge of the sample in the “downstream” direction determined by the sign of the magnetic field. Lafont et al. studied electrical transport in GaAs-AlGaAs heterostructures, focusing on a previously less-studied spin-unpolarized state in the fractional quantum Hall regime. By considering various experimental configurations, they observed a component of the charge current flowing in the opposite, “upstream” direction. Science , this issue p. 54

Citations

• Anomalous Quantum Hall Effect: An Incompressible Quantum Fluid with Fractionally Charged Excitations
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