Phonon-mediated drag in double-layer two-dimensional electron systems

Article

关键词: FRICTIONAL DRAG;    HOLE TRANSPORT;    QUANTUM-WELLS;    COULOMB DRAG;    GAS LAYERS;    HETEROSTRUCTURES;    SCATTERING;    EXCHANGE;    2D;   

DOI  :  10.1103/PhysRevB.59.13114

来源: SCIE

【 摘 要 】

Experiments studying phonon mediated drag in the double-layer two-dimensional electron gas system are reported. Detailed measurements of the dependence of drag on temperature, layer spacing, density ratio, and matched density are discussed. Comparisons are made to theoretical results [M. C. Bonsager el al., Phys. Rev. B 57, 7085 (1998)] that propose the existence of a new coupled electron-phonon collective mode. The layer spacing and density dependence at matched densities for Samples with layer spacings below 2600 Angstrom do not support the existence of this mode, showing behavior expected for independent electron and phonon systems. The magnitude of the drag, however, suggests the alternate limit; one in which electrons and phonons are strongly coupled. The results for still larger layer spacing show significant discrepancies with the behavior expected for either limit. [S0163-1829(99)06407-3].

【 授权许可】

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