Two-subband quantum Hall effect in parabolic quantum wells
C. Ellenberger, B. Simovic, R. Leturcq, T. Ihn, S.E. Ulloa, K., Ensslin, D. C. Driscoll, A. C. Gossard
TL;DR
This paper investigates the two-subband quantum Hall effect in parabolic quantum wells, revealing unique magnetoresistance and Hall effect features linked to the second subband occupation, supported by empirical Landau fan analysis.
Contribution
It introduces an empirical extension of Landau fan charts incorporating density-dependent subband separation and enhanced spin-splitting to explain observed phenomena.
Findings
Pronounced minima in magnetoresistance between integer filling factors
Hall effect overshoots and plateau-like features near quantum Hall plateaus
Effects emerge with second subband occupation
Abstract
The low-temperature magnetoresistance of parabolic quantum wells displays pronounced minima between integer filling factors. Concomitantly the Hall effect exhibits overshoots and plateau-like features next to well-defined ordinary quantum Hall plateaus. These effects set in with the occupation of the second subband. We discuss our observations in the context of single-particle Landau fan charts of a two-subband system empirically extended by a density dependent subband separation and an enhanced spin-splitting g*.
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