Abstract
Using as a thermometer the temperature dependent magnetotransport of a two-dimensional electron gas, we find that the effective temperature scales with current as , where in the Shubnikov–de Haas regime, and at the critical points between adjacent quantum Hall plateaus, both integer and fractional. This implies the phonon energy emission rate changes from the expected to . We explain this as well as the dramatic enhancement in phonon emission efficiency using a hydrodynamic model.
- Received 15 September 1995
DOI:https://doi.org/10.1103/PhysRevLett.77.1143
©1996 American Physical Society