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The effect of metastable states of the impurities on quantized acoustoelectric current
Authors:CY Zhang  HZ Guo  H Yuan  C Lu  L Li  J Gao
Institution:1. School of Business Administration, Sejong University, 98 Gunja-dong, Gwangjin-gu, Seoul 143-747, South Korea;2. Graduate School of MOT, Sogang University, 35 Baekbeom-ro, Mapo-gu, Seoul 121-742, South Korea;3. Dept. of Information and Industrial Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, South Korea;4. Division of Business Administration, Hansung University, 116 Samseongyoro-16gil, Seongbuk-gu, Seoul 136-792, South Korea;1. AML, School of Aerospace Engineering, Tsinghua University, Beijing 100084, China;2. School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China
Abstract:We report a detailed experimental study of the fluctuations of acoustoelectric (AE) current induced by surface acoustic waves in a shallow-etched quantum point contact defined in a GaAs/AlxGa1?xAs heterostructure at 1.7 K. We observe that current fluctuations between two AE current plateaus are more obvious than those at the plateaus. Switching the metastable states of the impurities is considered as the physical origin of the current fluctuations.
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