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Anomalous dephasing of two-dimensional electrons in an AlGaAs/GaAs parabolic quantum well structure |
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| Authors: | K.H. Gao G. Yu A.J. SpringThorpe D.G. Austing T. Lin G.J. Hu N. Dai J.H. Chu |
| Affiliation: | aKey Laboratory of Polar Materials and Devices, Ministry of Education, East China Normal University, Shanghai 200062, People’s Republic of China;bNational Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Science, Shanghai 200083, People’s Republic of China;cInstitute for Microstructural Sciences M50, National Research Council of Canada, Montreal Road, Ottawa, Ontario, K1A 0R6, Canada |
| Abstract: | Magnetoconductivity measurements are performed on a parabolic quantum well structure. The weak localization effect is observed at a low magnetic field for both single-subband and double-subband occupation regimes. Applying weak-localization theory, we have extracted the dephasing rate. The extracted dephasing rate increases with increasing conductivity in the small-energy-transfer regime and shows a similar trend as the electron density is increased in the large-energy-transfer regime. This is in conflict with Fermi-liquid theory, and cannot be attributed to electron–phonon scattering. |
| Keywords: | A. AlGaAs/GaAs quantum well D. Weak localization D. Electron dephasing |
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