Heating of Two-Dimensional Holes in SiGe and the B = 0 Metal-Insulator Transition

Abstract

We study the resistivity vs. electric field dependence $\rho (E)$ of a 2D hole system in SiGe close to the B=0 metal-insulator transition. Using $\rho$ as a ``thermometer'' to obtain the effective temperature of the holes $T_e(E)$, we find that the $\rho (E)$ dependence can be attributed to hole heating. The hole-phonon coupling involves weakly screened piezoelectric and deformation potentials compatible with previous measurements. The damping of the Shubnikov-de Haas oscillations gives the same $T_e$ values. Thus the $\rho (E)$ dependence and the $E$-field ``scaling'' do not provide additional evidence for a quantum phase transition (QPT). We discuss how to study, in general, true $E$-field scaling and extract the ratio of the QPT characteristic lengths.

latex ChauCorSub.tex, 5 files, 4 figures, 4 pages submitted to Phys. Rev. Lett