Rotating molecules in optical lattices, alignment and monopole crystals

Details Rotating molecules in optical lattices, alignment and monopole crystals Rotating molecules in optical lattices, alignment and monopole crystals

2007-07-06

arxiv.org/abs/0707.0985v1

Physics

Condensed Matter

Other Condensed Matter

4 pages, 1 figure

Scientific paper

The recent progress towards production of near-ground state quantum-degenerate molecules raises the issue of how such "small" molecules behave in an optical lattice. In this Letter we show that the coupling of the molecular orientation to the local electric field direction will provide severalnew phenomena. In the case where the lasers forming different crystallographic directions of the lattice are incoherent, the orientation of the molecules is conserved (for L = 1) and a novel form of anisotropic superfluidity can be expected. When the lasers are coherent, and the optical lattice is such that the splitting of the rotational levels is large compared to the centre of mass energies,an adiabaic description of the molecular orientation is appropriate. This leads to geometric vector potentials, pseudo-magnetic monopoles and a frustrated band structure with degenerate minima.

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