Hui Zhai and Yong-Shi Wu J. Stat. Mech. (2005) P07003 doi:10.1088/1742-5468/2005/07/P07003
Hui Zhai1 and Yong-Shi Wu1,2
Show affiliationsWe propose a many-body wavefunction that exhibits both diagonal and off-diagonal long-range order. Incorporating short-range correlations due to interatomic repulsion, this wavefunction is shown to allow condensation of zero-point lattice vibrations and phase rigidity. In the presence of an external velocity field, such a perfect crystal will develop non-classical rotational inertia, exhibiting supersolid behaviour. In a sample calculation we show that the superfluid fraction in this state can be as large as of order 0.01 in a reasonable range of microscopic parameters. The relevance to the recent experimental evidence of a supersolid state given by Kim and Chan is discussed.
63.70.+h Statistical mechanics of lattice vibrations and displacive phase transitions
82B20 Lattice systems (Ising, dimer, Potts, etc.) and systems on graphs
Quantum gases, liquids and solids
Issue 07 (July 2005)
Received 27 May 2005, accepted for publication 27 June 2005
Published 8 July 2005
Hui Zhai and Yong-Shi Wu J. Stat. Mech. (2005) P07003
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