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Seminars & Lectures

* TITLE

Phase Transitions and Pairing Mechanisms in Open Many-Body Quantum Systems with Cold Atoms

* SPEAKERS

Name	Affiliation	E-mail
Senastian Diehl	Univ. of Innsbruck

* HOST(Applicant)

Name	Affiliation	E-mail
Tetsuya Takimoto	APCTP

* DATE / TIME

2011-07-26, 2:00pm

* ABSTRACT

An open many-body quantum system, whose time evolution is governed by a master equation, can be driven into a given pure quantum state by an appropriate design of the system-reservoir coupling in cold atomic gases. After explaining the basic setting, we discuss two implications: First, a dynamical phase transition which results from the competition of Hamiltonian and dissipative Liouvillian dynamics, which shares features of both a quantum phase transition in that it is interaction driven, and a classical one in that the ordered phase terminates in a mixed state. Second, we present a new pairing mechanism for fermions based on quasi-local single-particle dissipative operations, which works in the absence of attractive forces. The resulting zero entropy zero phase with arbitrary symmetry constitutes a valuable initial state for the quantum simulation of the fermionic Hubbard model.

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