The quantum lifetime of two-dimensional holes in a GaAs/AlGaAs double quantum well is determined via tunneling spectroscopy. At low temperatures the lifetime is limited by impurity scattering but at higher temperatures hole-hole Coulomb scattering dominates. Our results are consistent with Fermi liquid theory, at least up to r_s = 11. At the highest temperatures the measured width of the hole spectral function becomes comparable to the Fermi energy. A new, tunneling-spectroscopic, method for determining the in-plane effective mass of the holes is also demonstrated.
@article{arxiv.0705.4072,
title = {Quantum Lifetime of Two-Dimensional Holes},
author = {J. P. Eisenstein and D. Syphers and L. N. Pfeiffer and K. W. West},
journal= {arXiv preprint arXiv:0705.4072},
year = {2012}
}