Issue
EPL
Volume 82, Number 1, April 2008
Article Number 16001
Number of page(s) 5
Section Condensed Matter: Structural, Mechanical and Thermal Properties
DOI http://dx.doi.org/10.1209/0295-5075/82/16001
Published online 12 March 2008
EPL, 82 (2008) 16001
DOI: 10.1209/0295-5075/82/16001

Elementary excitation in a supersolid

Jinwu Ye

Department of Physics, The Pennsylvania State University - University Park, PA, 16802, USA

jye@phys.psu.edu

received 14 August 2007; accepted in final form 4 February 2008; published April 2008
published online 12 March 2008

Abstract
We study elementary low-energy excitations inside a supersolid. We find that the coupling between the longitudinal lattice vibration mode and the superfluid mode leads to two longitudinal modes (one upper branch and one lower branch) inside the supersolid, while the transverse modes in the supersolid stay the same as those inside a normal solid. We also work out various experimental signatures of these novel elementary excitations by evaluating the Debye-Waller factor, density-density correlation, vortex loop-vertex loop interactions, specific heat and excess entropy from the vacancies per mole.

PACS
67.25.D- - Superfluid phase.

© EPLA 2008