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Accueil du site > Séminaires > Séminaires 2011 > Bloch oscillations without lattice : dynamics of mobile impurities in one-dimensional quantum liquids

mardi 5 avril — 14:00

Bloch oscillations without lattice : dynamics of mobile impurities in one-dimensional quantum liquids

Dimitri Gangardt

par Pierre Pujol - 5 avril 2011

A quantum impurity, i.e. a particle different from the others, moving in quantum liquid in one dimension is an interesting many-body problem. The dynamics of such mobile impurity is very rich due to its strong interactions with collective degrees of freedom of the liquid. One of the manifestations of this is the periodicity of the dispersion law of the impurity, similar to that of a particle in a lattice. Under action of an external force the motion of the particle exhibits Bloch oscillations. We discuss the role of dissipative processes and show that as a result the Bloch oscillations become superimposed with a drift. Our main finding is that the drift velocity and the period of the oscillations are extremely sensitive to the temperature as well as the underlying microscopic interactions.