Quantum Lifetime of Two-Dimensional Holes
J.P. Eisenstein, D. Syphers, L.N. Pfeiffer, and K.W. West
TL;DR
This paper measures the quantum lifetime of two-dimensional holes in GaAs/AlGaAs quantum wells, revealing impurity and Coulomb scattering effects, and introduces a new tunneling spectroscopy method for effective mass determination.
Contribution
It provides experimental insights into hole scattering mechanisms and introduces a novel tunneling spectroscopy technique for effective mass measurement.
Findings
Quantum lifetime limited by impurities at low T
Hole-hole Coulomb scattering dominates at higher T
New method for in-plane effective mass measurement
Abstract
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.
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