Seminar on Disorder and strong electron correlations: "Glassy physics, excitations, and avalanches in electron glasses"
Starts 18 Oct 2012 12:30
Ends 18 Oct 2012 20:00
Central European Time
Leonardo da Vinci Building Luigi Stasi Seminar Room
Strada Costiera, 11
I - 34151 Trieste (Italy)
Electron glasses are disordered systems of localized electrons with long-range Coulomb interaction, as found at low temperature in doped semiconductors, amorphous semiconductors, and granular metals.
Experiments on several of these systems demonstrate a very slowly relaxing conductivity and striking non-equilibrium effects that suggest glassy physics of electronic origin.
I will review our recent studies of the electron glass problem, mostly based on large-scale numerical computations, addressing the existence of a thermodynamic glass phase, the shape of the Coulomb gap in the single-particle density of states (which affects the variable-range hopping conductivity), and the statistics of the charge avalanches induced by a small perturbation of the system. Throughout the talk I will emphasize analogies and differences between electron glasses and spin glasses.