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A: Fachverband Atomphysik
A 36: Ultra-Cold Atoms, Ions and BEC V (with Q)
A 36.1: Fachvortrag
Freitag, 6. März 2009, 10:30–11:00, VMP 6 HS-C
Supersolidity in a commensurate mixture of one-dimensional hardcore bosons with mass imbalance — •Tassilo Keilmann1, Ignacio Cirac1, and Tommaso Roscilde1,2 — 1Max-Planck-Institut für Quantenoptik, Garching, Germany — 2Ecole Normale Supérieure de Lyon, Lyon, France
We propose two methods to create a superfluid solid phase of an attractive mixture of mass-imbalanced hardcore bosons in a 1D optical lattice. At a commensurate filling with 2-to-1 filling ratio, we observe the formation of a crystal of trimers (made of two heavy and one light particle) which shows quasi-condensation and superfluidity for both particle species at the same time - hence a two-species supersolid. Supersolidity is observed both in the ground state of the system, as well as out of equilibrium in the stationary state that the system attains in the Hamiltonian evolution, that starts off initially from a crystal of trimers. These two situations correspond to two different preparation protocols (simple adiabatic loading into an optical lattice, and release from a superlattice) which can both lead to the direct observation of supersolidity in optical lattices using present experimental techniques.