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Exchange-mediated dynamic screening in the integer quantum Hall regime
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Oswald, Josef and Römer, Rudolf A. (2017) Exchange-mediated dynamic screening in the integer quantum Hall regime. Europhysics Letters, 117 (5). 57009. doi:10.1209/0295-5075/117/57009 ISSN 0295-5075.
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Official URL: https://doi.org/10.1209/0295-5075/117/57009
Abstract
We study many-body interaction effects in the spatially-resolved filling factor (ν) distribution for higher Landau levels (LLs) via self-consistent Hartree-Fock simulations in the integer quantum Hall (IQH) regime. Our results indicate a strong, interaction-induced tendency to avoid the simultaneous existence of partially filled spin-up and spin-down LLs. Rather, we find that such partially filled LLs consist of coexisting regions of full and empty LLs. At the boundaries between the regions of full and empty LLs, we observe edge stripes of nearly constant ν close to half filling. This suggests that the exchange interaction induces a behavior similar to a Hund’s rule for the occupation of the spin split LLs. The screening of the disorder and edge potential appears significantly reduced as compared to static Thomas-Fermi screening [1]. Our results are consistent with a local, lateral ν dependence of the exchange-enhanced spin splitting. Hence, on quantum-coherent length scales as probed here, the electron system of the IQH effect behaves similar to a non-interacting single particle system — not because of the absence, but rather due to the dominance of many-body effects.
Item Type: | Journal Article | ||||||||||||
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Subjects: | Q Science > QC Physics | ||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||
Library of Congress Subject Headings (LCSH): | Quantum Hall effect, Electrons, Magnetic fields, Quantum field theory, Electron transport, Mesoscopic phenomena (Physics) | ||||||||||||
Journal or Publication Title: | Europhysics Letters | ||||||||||||
Publisher: | EDP Sciences | ||||||||||||
ISSN: | 0295-5075 | ||||||||||||
Official Date: | 10 May 2017 | ||||||||||||
Dates: |
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Volume: | 117 | ||||||||||||
Number: | 5 | ||||||||||||
Article Number: | 57009 | ||||||||||||
DOI: | 10.1209/0295-5075/117/57009 | ||||||||||||
Status: | Peer Reviewed | ||||||||||||
Publication Status: | Published | ||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||||||
Date of first compliant deposit: | 27 April 2017 | ||||||||||||
Date of first compliant Open Access: | 27 September 2017 | ||||||||||||
RIOXX Funder/Project Grant: |
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