Wednesday, April 17, 2013

1304.4258 (F. Trousselet et al.)

Competing supersolids of ultracold Bose-Bose mixtures in a triangular
optical lattice

F. Trousselet, P. Rueda, A. Ralko
We study the ground state properties of a frustrated two-species mixture of bosons in an optical triangular lattice, as a function of tunable amplitudes for tunnelling and interactions. By combining three different methods, a self-consistent cluster mean-field, exact diagonalizations and effective theories, we unravel a very rich and complex phase diagram. More specifically, we discuss the existence of three original mixture supersolids: (i) a commensurate with frozen densities and spinlike color supersolidity, in a regime of strong interspecies interactions; and (ii) when this interaction is weaker, two mutually competing incommensurate supersolids. Finally, we show how these phases can be stabilized by the quantum melting of peculiar insulating parent Mott states.
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