Electron-Electron Umklapp Process in Two-Dimensional Electron Gas under a Spatially Alternating Magnetic Field.

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  • Kato Mayumi
    Institute for Solid State Physics, University of Tokyo, Roppongi, Minato–ku, Tokyo 106–8666
  • Endo Akira
    Institute for Solid State Physics, University of Tokyo, Roppongi, Minato–ku, Tokyo 106–8666
  • Sakairi Makoto
    Institute for Solid State Physics, University of Tokyo, Roppongi, Minato–ku, Tokyo 106–8666
  • Katsumoto Shingo
    Institute for Solid State Physics, University of Tokyo, Roppongi, Minato–ku, Tokyo 106–8666
  • Iye Yasuhiro
    Institute for Solid State Physics, University of Tokyo, Roppongi, Minato–ku, Tokyo 106–8666

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We have studied the transport phenomenon in two-dimensional electron gas at a GaAs/AlGaAs heterointerface placed in a spatially alternating magnetic field. The effect of the periodic magnetic field is twofold. One is the effective mass renormalization which manifests itself as resistivity enhancement in the T → 0 limit. The other is a T2-dependent relaxation rate which is attributed to the electron-electron Umklapp scattering. A similar phenomenon observed at higher bias current provides additional support to this interpretation and forms a basis for a new method of hot electron thermometry.

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