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Energy relaxation in a low-density nonequilibrium 2D hole gas at the quantum hall plateau-plateau transition

ORAL

Abstract

We have measured the derivative S = dRxy/dB of the transverse resistance Rxy vs magnetic field B at the ν=3 -> ν=2 (B=0.45 T) quantum Hall plateau-plateau transition (PPT) , as function of the sample temperature T and dissipated Joule’s power P in a low-density, p-doped GaAs/AlGaAs quantum well with a high interaction parameter rs ~ 23 (nh= 2.9 x 1010 /cm-2, hole mobility μ = 2.4 x 105 cm2/Vs). We present P-T curves constructed by matching P and T values at a given S, and compare these to a set of similar curves obtained for the sample resistance R at B=0. At low temperatures, the P-T data in the magnetic field and at B=0 diverge suggesting that the thermal coupling between the holes and the lattice increases in the magnetic field and makes the holes effectively cooler at a given P. We also find that the thermal coupling in the magnetic field shows a weaker temperature dependence than at B=0. We compare these findings to an earlier work on a system with a lower rs=2.17 [1] and discuss possible nonlinear effects near the PPT under conditions of electric current flow. [1] Edmond Chow, H. P. Wei, S. M. Girvin, and M. Shayegan. Phys. Rev. Lett., 1996. Vol. 77(6), pp 1143-1146.

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Presenters

  • Elina Klysheva

    Department of Physics, University Of Cincinnati

Authors

  • Dmitrii Kruglov

    Department of Physics, University Of Cincinnati

  • Elina Klysheva

    Department of Physics, University Of Cincinnati

  • Andrei Kogan

    Department of Physics, University Of Cincinnati

  • Chieh-Wen Liu

    Department of Physics, Case Western Reserve University

  • Xuan Gao

    Case Western Reserve University, Physics, Case Western Reserve University, Department of Physics, Case Western Reserve University

  • Loren Pfeiffer

    Princeton University, Princeton Institute for the Science and Technology of Materials (PRISM), Princeton University, Department of Electrical Engineering, Princeton University, Electrical Engineering, Princeton, Electrical Engineering, Princeton University, Princeton

  • Ken W. West

    Princeton University, Princeton Institute for the Science and Technology of Materials (PRISM), Princeton University, Department of Electrical Engineering, Princeton University, Electrical Engineering, Princeton, Electrical Engineering, Princeton University, Princeton