M. Pollak (UCR) A. Efros (Utah)

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Presentation transcript:

Dissipative effects in the electron glass relaxation dynamics of a quantum glass M. Pollak (UCR) A. Efros (Utah) M. Ben-Chorin (HU) V. Savateev (HU) A. Vaknin (HU) V. Orlyanchik (HU)

unless otherwise noted: T»4K The basic phenomena …quench the sample from high T… …slow relaxation… Samples are thin films of crystalline or amorphous indium-oxide, disorder-tuned to be in the hopping regime unless otherwise noted: T»4K Robertson and Wilkes, Polymer, 42, 1581 (2001) In2O3-x

…more ways to get it out of equilibrium... …apply large source-drain field… …change gate voltage… Gold film Sio2 cover-glass indium-oxide film …or raise temperature…

…one more way to get it out of equilibrium... electromagnetic radiation …zap it with light… …just like changing gate voltage… …not all photons are born equal…

Memory effects …aging… PRL, 92, 066801 (2004) PRL, 84, 3402 (2000) “F-protocol” PRL, 92, 066801 (2004) “T-protocol” “Vg-protocol” PRL, 84, 3402 (2000) PRB, 73, 214204 (2006)

Varying the temperature… Gold film Sio2 cover-glass indium-oxide film Fixed disorder Varying the temperature… Fixed T (=4.1K) Varying the disorder…

Electron Glass Structural Glass Dynamics 30K 28K Rheinstadter et al, PRB 69, 144427 (2004) Electron Glass

Electron Glass Structural Glass Dynamics 30K 28K Rheinstadter et al, PRB 69, 144427 (2004) Electron Glass

Dynamics – how is measured The Two-Dip Experiment t …one way to estimate t... G* amorphous indium-oxide [PRL, 81, 669 (1998)] All samples with SIMILAR resistance

Dynamics – measured differently …as function of temperature…

Dynamics …as function of n…

The relaxation rate of the electron glass is: Either T independent or it slows down with T (in contrast with classical glasses) T dependence diminishes with G* (determined by n) AOTBE – the larger G* is, the slower is the relaxation rate

…off the record…