Universität zu Köln

Rapp, Akos, Mandt, Stephan and Rosch, Achim ORCID: 0000-0002-6586-5721 (2010). Equilibration Rates and Negative Absolute Temperatures for Ultracold Atoms in Optical Lattices. Phys. Rev. Lett., 105 (22). COLLEGE PK: AMER PHYSICAL SOC. ISSN 0031-9007

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Abstract

As highly tunable interacting systems, cold atoms in optical lattices are ideal to realize and observe negative absolute temperatures, T < 0. We show theoretically that, by reversing the confining potential, stable superfluid condensates at finite momentum and T < 0 can be created with low entropy production for attractive bosons. They may serve as smoking gun'' signatures of equilibrated T < 0. For fermions, we analyze the time scales needed to equilibrate to T < 0. For moderate interactions, the equilibration time is proportional to the square of the radius of the cloud and grows with increasing interaction strengths as atoms and energy are transported by diffusive processes.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Rapp, Akos UNSPECIFIED UNSPECIFIED UNSPECIFIED Mandt, Stephan UNSPECIFIED UNSPECIFIED UNSPECIFIED Rosch, Achim UNSPECIFIED orcid.org/0000-0002-6586-5721 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-492274
DOI:	10.1103/PhysRevLett.105.220405
Journal or Publication Title:	Phys. Rev. Lett.
Volume:	105
Number:	22
Date:	2010
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	0031-9007
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language NANOKELVIN TEMPERATURES; MOTT INSULATOR Multiple languages Physics, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/49227