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Impurities in a supersolid | | Xue-Feng Zhang
; Yu-Chuan Wen
; Sebastian Eggert
; | | Date: |
31 Mar 2010 | | Abstract: | We study the effect of impurities in a supersolid phase in comparison to the
behavior in the pure solid and superfluid phases. The supersolid is realized by
the spin-1/2 model on a triangular lattice with ferromagnetic-antiferromagnetic
XXZ couplings or equivalently interacting hardcore bosons. A static vacancy
always lowers the magnitude of the order parameter in the pure solid or
superfluid phases. In the supersolid phase, however, the impurity directly
affects both order parameters and thereby reveals an interesting interplay
between them. The solid order is now enhanced at the cost of a strong reduction
of the superfluidity. In the solid phase we observe interesting impurity
pinning effects and an impurity driven first-order transition between two
distinct ordered states. The case of several impurities is also discussed. | | Source: | arXiv, 1004.0002 | | Services: | Forum | Review | PDF | Favorites | |
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