Fluctuations and magnetoresistance oscillations near the half-filled Landau level
Abstract
We study theoretically the magnetoresistance oscillations near a half-filled lowest Landau level (ν = 1/2) that result from the presence of a periodic one-dimensional electrostatic potential. In this work, we use the Dirac composite fermion theory of Son, where the ν = 1/2 state is described by a (2 + 1)-dimensional theory of quantum electrodynamics. We extend previous work that studied these oscillations in the mean-field limit by considering the effects of gauge-field fluctuations within a large flavor approximation. A self-consistent analysis of the resulting Schwinger-Dyson equations suggests that fluctuations dynamically generate a Chern-Simons term for the gauge field and a magnetic field–dependent mass for the Dirac composite fermions away from ν = 1/2. We show how this mass results in a shift of the locations of the oscillation minima that improves the comparison with experiment. The temperature-dependent amplitude of these oscillations may enable an alternative way to measure this mass. This amplitude may also help distinguish the Dirac and Halperin, Lee, and Read composite fermion theories of the half-filled Landau level.
- Authors:
-
- Univ. of California, Riverside, CA (United States)
- Publication Date:
- Research Org.:
- Univ. of California, Riverside, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); Hellman Foundation; National Science Foundation (NSF)
- OSTI Identifier:
- 1803898
- Grant/Contract Number:
- SC0020007; PHY-1607611
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B
- Additional Journal Information:
- Journal Volume: 100; Journal Issue: 16; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Materials Science; Physics
Citation Formats
Mitra, Amartya, and Mulligan, Michael. Fluctuations and magnetoresistance oscillations near the half-filled Landau level. United States: N. p., 2019.
Web. doi:10.1103/physrevb.100.165122.
Mitra, Amartya, & Mulligan, Michael. Fluctuations and magnetoresistance oscillations near the half-filled Landau level. United States. https://doi.org/10.1103/physrevb.100.165122
Mitra, Amartya, and Mulligan, Michael. Mon .
"Fluctuations and magnetoresistance oscillations near the half-filled Landau level". United States. https://doi.org/10.1103/physrevb.100.165122. https://www.osti.gov/servlets/purl/1803898.
@article{osti_1803898,
title = {Fluctuations and magnetoresistance oscillations near the half-filled Landau level},
author = {Mitra, Amartya and Mulligan, Michael},
abstractNote = {We study theoretically the magnetoresistance oscillations near a half-filled lowest Landau level (ν = 1/2) that result from the presence of a periodic one-dimensional electrostatic potential. In this work, we use the Dirac composite fermion theory of Son, where the ν = 1/2 state is described by a (2 + 1)-dimensional theory of quantum electrodynamics. We extend previous work that studied these oscillations in the mean-field limit by considering the effects of gauge-field fluctuations within a large flavor approximation. A self-consistent analysis of the resulting Schwinger-Dyson equations suggests that fluctuations dynamically generate a Chern-Simons term for the gauge field and a magnetic field–dependent mass for the Dirac composite fermions away from ν = 1/2. We show how this mass results in a shift of the locations of the oscillation minima that improves the comparison with experiment. The temperature-dependent amplitude of these oscillations may enable an alternative way to measure this mass. This amplitude may also help distinguish the Dirac and Halperin, Lee, and Read composite fermion theories of the half-filled Landau level.},
doi = {10.1103/physrevb.100.165122},
journal = {Physical Review. B},
number = 16,
volume = 100,
place = {United States},
year = {Mon Oct 14 00:00:00 EDT 2019},
month = {Mon Oct 14 00:00:00 EDT 2019}
}
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