Physics – Condensed Matter – Superconductivity
Scientific paper
2005-01-17
Phys. Rev. B 72, 132504 (2005)
Physics
Condensed Matter
Superconductivity
5 pages, 2 figures
Scientific paper
10.1103/PhysRevB.72.132504
Although both vacancies and interstitial have relatively high activation energies in the normal solid, we propose that a lower energy bound state of a vacancy and an interstitial may facilitate vacancy condensation to give supersolidity in $^{4}$He . We use a phenomenological two-band boson lattice model to demonstrate this new mechanism and discuss the possible relevance to the recently observed superfluid-like, non-classical rotational inertial experiments of Kim and Chan in solid $^{4}$He. Some of our results may also be applicable to trapped bosons in optical lattices.
Dai Xian-Xin
Ma Michael
Zhang Fu Chun
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