Current dependent dephasing in an Aharonov-Bohm Interferometer

ORAL

Abstract

We have studied the temperature dependence of the current induced dephasing rate in a ballistic GaAs/Al$_{x}$Ga$_{1-x}$As ring. The dephasing rate is linearly proportional to the temperature regardless of the current applied. The AB oscillations are suppressed by the increase of the excitation current; however, the dephasing becomes less temperature dependent. Our observations cannot be interpreted by Joule heating effect. Possible decoherence mechanisms caused by the excess current will be discussed.

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Authors

  • Kuan-Ting Lin

    • Department of the Physics, National Tsing Hua University, Hsinchu 30013, Taiwan

  • Yiping Lin

    • Department of the Physics, National Tsing Hua University, Hsinchu 30013, Taiwan

  • J. C. Chen

    • Department of the Physics, National Tsing Hua University, Hsinchu 30013, Taiwan

  • T. Ueda

    • Department of Basic Science, University of Tokyo, Komaba, Tokyo 153-8902, Japan

  • S. Komiyama

    • Department of Basic Science, University of Tokyo, Komaba, Tokyo 153-8902, Japan