Ultrafast (but Many-Body) Relaxation in a Low-Density Electron Glass

Details Ultrafast (but Many-Body) Relaxation in a Low-Density Electron Glass Ultrafast (but Many-Body) Relaxation in a Low-Density Electron Glass

2010-05-23

arxiv.org/abs/1005.4164v2

Phys. Rev. Lett. 105, 086601 (2010)

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, 4 figures, Appeared in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.105.086601

We present a study of the relaxation dynamics of the photoexcited conductivity of the impurity states in the low-density electronic glass, phosphorous-doped silicon Si:P. Using optical pump-terahertz probe spectroscopy we find strongly temperature and fluence dependent glassy power-law relaxation occurring over sub-ns time scales. Such behavior is in contrast to the much longer time scales found in higher electron density glassy systems. We also find evidence for both multi-particle relaxation mechanisms and/or coupling to electronic collective modes and a low temperature quantum relaxational regime.

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