Non-equilibrium excited-state fractionally quantized Hall effects observed via current bias spectroscopy

Authors

• U. Kushan Wijewardena, Georgia State University
• Ramesh G. Mani, Georgia State University
• Annika Kriisa, Georgia State University
• Christian Reichl, ETH Zürich
• Werner Wegscheider, ETH Zürich

Document Type

Article

Publication Date

12-1-2024

Publication Title

Communications Physics

Abstract

Studies of fractional quantum Hall effects (FQHE) across various two-dimensional electronic systems (2DES) have helped to establish the equilibrium FQHE many-body ground states with fractionally charged excitations and composite particles in condensed matter. Then, the question arises whether an FQHE system driven to non-equilibrium can approach a different stationary state from the known equilibrium FQHE states. To investigate this question, we examine FQHE over filling factors, ν, 2 ≥ ν ≥ 1 under non-equilibrium finite bias conditions realized with a supplementary dc-current bias, IDC, in high mobility GaAs/AlGaAs devices. Here, we show that all observable canonical equilibrium FQHE resistance minima at ∣IDC∣ = 0 undergo bimodal splitting vs. IDC, yielding branch-pairs and diamond shapes in color plots of the diagonal resistance, as canonical FQHE are replaced, with increasing IDC, by excited-state fractionally quantized Hall effects at branch intersections. A tunneling model serves to interpret the results.

Volume Number

7

Issue Number

1

DOI

10.1038/s42005-024-01759-7

Recommended Citation

Wijewardena, U. Kushan; Mani, Ramesh G.; Kriisa, Annika; Reichl, Christian; and Wegscheider, Werner, "Non-equilibrium excited-state fractionally quantized Hall effects observed via current bias spectroscopy" (2024). Faculty and Staff Works. 975.
https://kb.gcsu.edu/fac-staff/975