Phonon-mediated drag in double-layer two-dimensional electron systems
Abstract
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. Bønsager et 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 Å 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.
- Publication:
-
Physical Review B
- Pub Date:
- May 1999
- DOI:
- 10.1103/PhysRevB.59.13114
- arXiv:
- arXiv:cond-mat/9904188
- Bibcode:
- 1999PhRvB..5913114N
- Keywords:
-
- 73.40.-c;
- 72.10.Di;
- 73.61.Ey;
- Electronic transport in interface structures;
- Scattering by phonons magnons and other nonlocalized excitations;
- III-V semiconductors;
- Condensed Matter - Mesoscale and Nanoscale Physics
- E-Print:
- 9 pages, 9 figures, Latex