Screening, Nonadiabaticity, and Quantized Acoustoelectric Current |
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Authors: | Michael Pustilnik Karsten Flensberg and Qian Niu |
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Affiliation: | (1) Danish Institute of Fundamental Metrology, Anker Engelunds Vej 1, Building 307, DK-2800 Lyngby, Denmark;(2) Ørsted Laboratory, Niels Bohr Institute, Universitetsparken 5, DK-2100 Copenhagen, Denmark;(3) Department of Physics, The University of Texas at Austin, Austin, TX 78712, USA |
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Abstract: | Quantized single-electron transport driven by surface acousticwaves (SAW) through a pinched-off narrow constriction isstudied theoretically. Long-range Coulomb interaction causesthe tunneling coupling between the two-dimensional electrongas (2DEG) and the moving minimum of the SAW-induced potentialto decay rapidly with time. The energy scale / ,associated with the characteristic time of this decay ,controls both the width of the transition regions between theplateaus and the slope of the plateaus. This sets a limit forthe accuracy of the quantization of acoustoelectric current atlow temperature. |
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