|Unusual behavior of sound velocity of a Bose gas in an optical superlattice at quasi-one-dimension|
|L.; Chen Chen, Z.; Li, W.; Zhang, Z. D.; Liang, Z. X.
|Source Publication||European Physical Journal D
|Abstract||A Bose gas trapped in a one-dimensional optical superlattice has emerged as a novel superfluid characterized by tunable lattice topologies and tailored band structures. In this work, we focus on the propagation of sound in such a novel system and have found new features on sound velocity, which arises from the interplay between the two lattices with different periodicity and is not present in the case of a condensate in a monochromatic optical lattice. Particularly, this is the first time that the sound velocity is found to first increase and then decrease as the superlattice strength increases even at one dimension. Such unusual behavior can be analytically understood in terms of the competition between the decreasing compressibility and the increasing effective mass due to the increasing superlattice strength. This result suggests a new route to engineer the sound velocity by manipulating the superlattice's parameters. All the calculations based on the mean-field theory are justified by checking the exponent gamma of the off-diagonal one-body density matrix that is much smaller than 1. Finally, the conditions for possible experimental realization of our scenario are also discussed.|
; li, wu
; zhang, zhidong
; liang, zhaoxin] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [chen, zhu] inst appl phys & computat math, natl key lab sci & technol computat phys, beijing 100088, peoples r china.
; chen, l (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, wenhua rd 72, shenyang 110016, peoples r china.
L.,Chen Chen, Z.,Li, W.,et al. Unusual behavior of sound velocity of a Bose gas in an optical superlattice at quasi-one-dimension[J]. European Physical Journal D,2014,68(12).
L.,Chen Chen, Z.,Li, W.,Zhang, Z. D.,&Liang, Z. X..(2014).Unusual behavior of sound velocity of a Bose gas in an optical superlattice at quasi-one-dimension.European Physical Journal D,68(12).
L.,et al."Unusual behavior of sound velocity of a Bose gas in an optical superlattice at quasi-one-dimension".European Physical Journal D 68.12(2014).
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