Main navigation | Main content

« fall 2009 - spring 2010 - summer 2010 »

This week | Next week | This semester | All future | Print view

This week | Next week | This semester | All future | Print view

Thursday, December 10th 2009

1:25 pm:

In disordered insulators, the interplay of the disorder and the long-range electron-electron interaction gives rise to a correlated regime at low temperature, the Coulomb glass or electron glass. The single-particle density of states exhibits a soft "Coulomb" gap, the shape of which is still debated and is reflected in the hopping conductivity. It was also predicted long ago that disordered insulators exhibit a "glassy" dynamics, which has now received ample experimental confirmation. In recent mean-field theoretical work, it was proposed that the glassy phenomenology reflects a transition to an equilibrium glass phase, similar to the much-debated Almeida-Thouless transition in spin glass. I will discuss the results of large-scale Monte Carlo simulations of the Coulomb glass addressing these questions. Our main results are a strong evidence against the existence of an equilibrium glass phase in 3D, and a confirmation of the Efros-Shklovskii prediction of a parabolic shape of the density of states at the Coulomb gap. I will also discuss results for the 3D Random Field Ising model that highlight the role of the interaction range, and for the 2D Coulomb glass.

The weekly calendar is also available via subscription to the physics-announce mailing list, and by RSS feed.