Effect of Magnetization on the Tunneling Anomaly in Compressible Quantum Hall States
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PhysRevLett.120.266601.pdf
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320.48 KB
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Author(s)
Chowdhury, Debanjan
Skinner, Brian J
Lee, Patrick A
Date Issued
June 2018
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Chowdhury, Debanjan et al. "Effect of Magnetization on the Tunneling Anomaly in Compressible Quantum Hall States." Physical Review Letters 120, 26 (June 2018): 266601 © 2018 American Physical Society
Version
Final published version
Abstract
Tunneling of electrons into a two-dimensional electron system is known to exhibit an anomaly at low bias, in which the tunneling conductance vanishes due to a many-body interaction effect. Recent experiments have measured this anomaly between two copies of the half-filled Landau level as a function of in-plane magnetic field, and they suggest that increasing spin polarization drives a deeper suppression of tunneling. Here, we present a theory of the tunneling anomaly between two copies of the partially spin-polarized Halperin-Lee-Read state, and we show that the conventional description of the tunneling anomaly, based on the Coulomb self-energy of the injected charge packet, is inconsistent with the experimental observation. We propose that the experiment is operating in a different regime, not previously considered, in which the charge-spreading action is determined by the compressibility of the composite fermions.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Research Laboratory of Electronics
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.120.266601
