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arXiv · 1709.06091

Effect of magnetization on the tunneling anomaly in compressible quantum Hall states

Debanjan Chowdhury·Brian Skinner·Patrick A. Lee
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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.

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Debanjan Chowdhury, Brian Skinner, Patrick A. Lee. 2017-09-18. Effect of magnetization on the tunneling anomaly in compressible quantum Hall states. https://doi.org/10.1103/physrevlett.120.266601

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