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Anomalous pump-driven spectral transfer in 1D spin- full Mott Insulators

Adrian Feiguin, Northeastern University, Boston

18.12.2014 at 11:00 

In strongly correlated systems the rigid-band picture --used to understand the phenomenology of semiconductors-- fails dramatically: excitations depend drastically on the electronic density, and the spectrum changes dynamically as the system is excited out of  equilibrium.
In this work, we study the spectral properties of a Mott insulating Hubbard chain as it is driven out of equilibrium by a pulse of radiation. We observe the emergence of excitations in the Mott gap which, for the case of weak interactions, ''melt'' the gap completely. We identify intra and inter-band transitions, and we analyze the role of spin and charge separation comparing to zero- temperature, and finite-temperature results in equilibrium.

H 206 - Schellingstr. 4