A Temperature Driven Hole-phonon Coupling Enhancement Effect in a Strongly Correlated 2D Hole System

ORAL

Abstract

In strongly correlated 2D electron/hole system confined in semiconductor heterointerfaces, a pronounced non-monotonic behavior in the resistivty vs. temperature, ρ(T), has been widely observed when the system becomes quantum degenerate but no consensus has been reached regarding its origin. Here we report a study of the the hole-phonon coupling strength around the peak temperature Tp of the non-monotonic ρ(T) in a dilute 2D hole system with strong correlations by measuring the hot hole energy relaxation rate. The data can be well fitted by Bloch-Grüneisen theory of hole-phonon scattering but the deformational potential constant D shows a rapid change near TP (around 6eV-12eV at high temperatures, T~TF, the Fermi temperature, and around 30-80eV at low temperatures, T<<TF). We suggest that these results could be related to the system being close to the transition into Wigner crystal state and compare them to the strong electron-phonon coupling effect in charge density wave states.

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Presenters

  • Shuhao Liu

    Dept. of Physics, Case Western Reserve Univ, Department of Physics, Case Western Reserve University

Authors

  • Shuhao Liu

    Dept. of Physics, Case Western Reserve Univ, Department of Physics, Case Western Reserve University

  • Chieh-Wen Liu

    Department of Physics, Case Western Reserve University

  • Arvind Shankar

    Department of Physics, Case Western Reserve University

  • Loren Pfeiffer

    Electrical Engineering, princeton university, Department of Electrical Engineering, Princeton University, Princeton University, Princeton Univ, Electrical Engineering, Princeton Univ, EE, Princeton University

  • K West

    Electrical Engineering, princeton university, Department of Electrical Engineering, Princeton University, Princeton University, Univ of Basel, Princeton Univ, Electrical Engineering, Princeton Univ, EE, Princeton University

  • Xuan Gao

    Dept. of Physics, Case Western Reserve Univ, Department of Physics, Case Western Reserve University