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  • Title: Effect of Magnetization on the Tunneling Anomaly in Compressible Quantum Hall States.
    Author: Chowdhury D, Skinner B, Lee PA.
    Journal: Phys Rev Lett; 2018 Jun 29; 120(26):266601. PubMed ID: 30004777.
    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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