Using Composite Fermions to Probe a Wigner Solid in 2D Hole Systems

ORAL

Abstract

We have studied a GaAs double-quantum-well structure that hosts an interacting, bilayer two-dimensional hole system with a large density difference between the two layers. At very low temperatures and large perpendicular magnetic field, we expect the two layers to exhibit distinct many-body states of holes: The high-density layer develops a Fermi sea of composite fermions when its last Landau Level is half-filled, while the holes in the low-density layer in the same magnetic field range are at very small fillings and should condense into a Wigner crystal. Via measuring the magneto-resistance of the bilayer system, we monitor signatures of the Wigner crystallization and melting

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Authors

  • Insun Jo

    • Dept. of Electrical Engineering, Princeton University, Princeton, NJ 08544

  • Yang Liu

    • Dept. of Electrical Engineering, Princeton University, Princeton, NJ 08544

  • H. Deng

    • Dept. of Electrical Engineering, Princeton University, Princeton, NJ 08544

  • M. Shayegan

    • Dept. of Electrical Engineering, Princeton University, Princeton, NJ 08544

  • L. N. Pfeiffer

    • Dept. of Electrical Engineering, Princeton University, Princeton, NJ 08544

  • K. W. West

    • Dept. of Electrical Engineering, Princeton University, Princeton, NJ 08544

  • K. W. Baldwin

    • Dept. of Electrical Engineering, Princeton University, Princeton, NJ 08544