Hot-hole effects in a dilute two-dimensional gas in

¹ DSM/Service de Physique de l'Etat Condensé, CEA-Saclay 91191 Gif-sur-Yvette Cedex, France
² Laboratory of Solid State Physics, ETH Zürich - CH-8093 Zürich, Switzerland
³ Laboratoire de Photonique et de Nanostructures, CNRS - 91460 Marcoussis, France
⁴ Paul Scherrer Institut - CH-5232 Villigen PSI, Switzerland

Received: 5 July 2002
Accepted: 10 December 2002

Abstract

We study the resistivity vs. electric-field dependence of a dilute two-dimensional hole (h) system in , on both sides of the crossover from weak to strong localization at B=0. Using ρ as a “thermometer” to obtain the effective temperature of the holes , we find that can be attributed to hole heating. In spite of the strong localization and h-h interactions, the power loss does not indicate any deviation from the density and temperature dependences predicted assuming independent and delocalized electrons. The consequences of these results on the h-h interaction assisted hopping, glassy behaviour and E-field scaling are developed. The hole-phonon coupling involves a limited screening, a deformation potential compatible with measurements at larger densities and temperatures, and a piezoelectric component which is definitely probed.