Superfluidity of flexible chains of polar molecules

Details Superfluidity of flexible chains of polar molecules Superfluidity of flexible chains of polar molecules

2011-01-10

arxiv.org/abs/1101.1901v2

Journal of Low Temperature Physics Volume: 165 Issue: 5-6 Special Issue: SI Pages: 213-226 (2011)

Physics

Condensed Matter

Other Condensed Matter

Submitted to Proceedings of the QFS2010 satellite conference "Cold Gases meet Many-Body Theory", Grenoble, August 7, 2010. Thi

Scientific paper

10.1007/s10909-011-0386-5

We study properties of quantum chains in a gas of polar bosonic molecules confined in a stack of N identical one- and two- dimensional optical lattice layers, with molecular dipole moments aligned perpendicularly to the layers. Quantum Monte Carlo simulations of a single chain (formed by a single molecule on each layer) reveal its quantum roughening transition. The case of finite in-layer density of molecules is studied within the framework of the J-current model approximation, and it is found that N-independent molecular superfluid phase can undergo a quantum phase transition to a rough chain superfluid. A theorem is proven that no superfluidity of chains with length shorter than N is possible. The scheme for detecting chain formation is proposed.

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