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NEWS

Dr. Adrian Kantian

University of Geneva

Tuesday, June 18th, 2013 at 12:00:00 PM  

Conference room Querzoli - LENS - via Nello Carrara 1 - Sesto Fiorentino (Florence)

Published on-line at 10:30:48 AM on Thursday, June 13th, 2013

Mobile impurities in one-dimensional cold gases

Dynamics of single mobile impurities in 1D quantum liquids: a novel universality class of single particle excitations.

Advances in cold gases physics are enabling experiments involving the direct manipulation and observation of single- or few-atom mobile impurities (10.1103/PhysRevA.85.023623, 10.1038/nphys2561) within a many-body quantum system, a topic of longstanding interest for condensed matter theory, where it is related to studies of e.g. conductivity and the X-ray edge problem.

In light of these developments we study the dynamics of single mobile impurities in 1D quantum liquids, using analytical and DMRG techniques. We address the question of whether the recently proposed subdiffusive regime of impurity motion (10.1103/PhysRevLett.99.240404, 10.1103/PhysRevLett.103.110401) constitutes a novel universality class of single particle excitations, one that is very different from that of the standard Tomonaga-Luttinger liquid excitations. We study the conditions for observing this regime and its' crossover to the ballistic regime. We furthermore examine the possibilities to observe the intermediate diffusive motion of impurities in these systems as well as various types of polaronic dynamics (10.1088/1367-2630/15/4/045018).

For further informations, please contact Prof. Francesco Minardi.