A Temperature Driven Hole-phonon Coupling Enhancement Effect in a Strongly Correlated 2D Hole System
ORAL
Abstract
In strongly correlated 2D electron/hole system confined in semiconductor heterointerfaces, a pronounced non-monotonic behavior in the resistivty vs. temperature, ρ(T), has been widely observed when the system becomes quantum degenerate but no consensus has been reached regarding its origin. Here we report a study of the the hole-phonon coupling strength around the peak temperature Tp of the non-monotonic ρ(T) in a dilute 2D hole system with strong correlations by measuring the hot hole energy relaxation rate. The data can be well fitted by Bloch-Grüneisen theory of hole-phonon scattering but the deformational potential constant D shows a rapid change near TP (around 6eV-12eV at high temperatures, T~TF, the Fermi temperature, and around 30-80eV at low temperatures, T<<TF). We suggest that these results could be related to the system being close to the transition into Wigner crystal state and compare them to the strong electron-phonon coupling effect in charge density wave states.
*The work at CWRU was funded by the NSF (DMR-1607631). The work at Princeton University was funded by the Gordon and Betty Moore Foundation, and by the NSF MRSEC (Grant# 1420541).
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Presenters
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Shuhao Liu
- Dept. of Physics, Case Western Reserve Univ
- Department of Physics, Case Western Reserve University