Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-01-27
Phys. Rev. Lett. 94, 086402 (2005)
Physics
Condensed Matter
Strongly Correlated Electrons
To appear in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.94.086402
We have studied the temperature dependent phonon emission rate $P$($T$) of a strongly interacting ($r_s\geq$22) dilute 2D GaAs hole system using a standard carrier heating technique. In the still poorly understood metallic state, we observe that $P$($T$) changes from $P$($T$)$\sim T^5$ to $P$($T$)$\sim T^7$ above 100mK, indicating a crossover from screened piezoelectric(PZ) coupling to screened deformation potential(DP) coupling for hole-phonon scattering. Quantitative comparison with theory shows that the long range PZ coupling between holes and phonons has the expected magnitude; however, in the metallic state, the short range DP coupling between holes and phonons is {\it almost twenty times stronger} than expected from theory. The density dependence of $P$($T$) shows that it is {\it easier} to cool low density 2D holes in GaAs than higher density 2D hole systems.
Boebinger Gregory S.
Gao Xuan P. A.
Mills Allen P. Jr.
Pfeiffer Loren N.
Ramirez Arthur P.
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