Spin Reconstruction in Quantum Hall Strips

ORAL

Abstract

We study the effect of electron-electron interactions on the ground state of a Quantum Hall Strip with triangular confinement in the Hartree-Fock Approximation. We find that for infinitesimal Zeeman splitting the soft-edge undergoes a spontaneous transition from a spin-unpolarized to spin-polarized ground state as a function of the magnetic field perpendicular to the strip. This spin-polarization shows up as an eye-structure in the dispersion and has a spatial separation of the order of a magnetic length. This transition is due to the interplay of strong edge confinement and electron-electron interaction and is independent on the Zeeman energy.

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Authors

  • Yafis Barlas

    National High Magnetic Field Lab, Tallahassee, FL

  • Gilad Barak

    Harvard University

  • Yogesh Joglekar

    Indiana University-Purdue University at Indianapolis, Indiana University- Purdue University Indianapolis, Indiana University -Purdue University Indianapolis (IUPUI)

  • Kun Yang

    National High Magnetic Field, Tallahassee, FL

  • Amir Yacoby

    Harvard University, Physics Department, Harvard University

  • Bertrand Halperin

    Physics Department, Harvard University, Harvard University, Harvard