Sep 15 – 18, 2014
Dept. of Physics and Astronomy
Europe/Rome timezone

Universal dynamics of a soliton after a quantum quench

Sep 15, 2014, 4:00 PM
30m
Aula Magna (Dept. of Physics and Astronomy)

Aula Magna

Dept. of Physics and Astronomy

A. Righi Building Via Irnerio 46, 40126 Bologna (Italy)

Speaker

Fabio Franchini (TS)

Description

We propose a new type of experimentally feasible quantum quench protocol. A quantum system is prepared in a coherent, localized excited state of a Hamiltonian, whose interaction strength is characterized by a control parameter. At some point during the evolution of this solitonic excitation, the parameter is suddenly changed. We study the dynamics of solitons after this global quench in a semi-classical, hydrodynamic, limit, for a wide class of systems, and we find it to be universal at short times, i.e. not depending on the microscopics of the physical system. Numerical support for these results is presented using the Calogero model and the non-linear Schroedinger equation, relevant for the implementation of the proposed protocol with ultracold bosons. Finally, it is shown that the effects of integrability breaking by a parabolic potential and by a power-law non-linearity do not change the universality of the short-time dynamics.

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