Hot electron magnetotransport in the high mobility GaAs/AlGaAs two dimensional electron system below 1K

ORAL

Abstract

Non-equilibrium hot electron phenomena play a major role in semiconductor transport when, for example, the heat applied directly to the electronic system becomes substantial. The carrier temperature can differ from the lattice temperature, and the carrier temperature results, in the steady state, from a balance between energy gain from the heating source, and energy loss to the lattice from electron-phonon scattering. In this experimental study, we examine heating induced by the small ac-bias current utilized in the low-frequency lock-in based four terminal transport measurements. Since at small bias current, the carrier heating is expected to be small, we have utilized an effect that is associated with a small energy scale to follow the heating effect, namely the spin splitting in the Shubnikov-de Haas effect. The development of fields such as spintronics and spin-based quantum computing have encouraged further studies, such as this one, of the parameters affecting the behavior of electron spin in low dimensional electron systems. Thus, magneto-transport measurements have been carried out below 1K to observe the ac current effect on the characteristic features of the GaAs/AlGaAs system. In this report, we show evidence for a carrier heating effect due to the small ac bias.

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Presenters

  • C.Rasadi Munasinghe

    Physics and Astronomy, Georgia State University

Authors

  • C.Rasadi Munasinghe

    Physics and Astronomy, Georgia State University

  • Binuka Gunawardana

    Physics and Astronomy, Georgia State University, Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA, Department of Physics and Astronomy, Georgia State University, Physics & Astronomy, Georgia State University, Georgia State University

  • Rasanga Samaraweera

    Physics and Astronomy, Georgia State University, Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA, Department of Physics and Astronomy, Georgia State University, Physics & Astronomy, Georgia State University, Georgia State University

  • Tharanga Nanayakkara

    Physics and Astronomy, Georgia State University, Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA, Department of Physics and Astronomy, Georgia State University, Physics & Astronomy, Georgia State University, Georgia State University

  • U. Kushan Wijewardena

    Physics and Astronomy, Georgia State University, Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA, Department of Physics and Astronomy, Georgia State University, Physics & Astronomy, Georgia State University, Georgia State University

  • Sajith Withanage

    Physics and Astronomy, Georgia State University, Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA, Department of Physics and Astronomy, Georgia State University, Physics & Astronomy, Georgia State University, Georgia State University

  • Annika Kriisa

    Physics and Astronomy, Georgia State University, Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA, Georgia State University, Department of Physics and Astronomy, Georgia State University, Physics & Astronomy, Georgia State University

  • Christian Reichl

    Solid State Physics, ETH Zürich, Laboratorium für Festkörperphysik, ETH Zürich, ETH Zürich, CH-8093 Zürich, Switzerland, Laboratorium für Festkörperphysik, ETH-Zurich, Solid State Physics Laboratory, ETH Zurich, Laboratorium für Festkörperphysik, ETH-Zürich, Department of Physics, ETH Zurich, Department of Physics, ETH Zurich, Switzerland, ETH Zurich

  • Werner Wegscheider

    Solid State Physics, ETH Zürich, Laboratorium für Festkörperphysik, ETH Zürich, ETH Zürich, CH-8093 Zürich, Switzerland, Laboratorium für Festkörperphysik, ETH-Zurich, Solid State Physics Laboratory, ETH Zurich, Laboratorium für Festkörperphysik, ETH-Zürich, Department of Physics, ETH Zurich, Department of Physics, ETH Zurich, Switzerland, ETH Zurich

  • Ramesh Mani

    Physics and Astronomy, Georgia State University, Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA, Georgia State University, Department of Physics and Astronomy, Georgia State University, Physics & Astronomy, Georgia State University