Unconventional quantum phases of lattice bosonic mixtures

Abstract

We consider strongly interacting boson-boson mixtures on one-dimensional lattices and, by adopting a qualitative mean-field approach, investigate their quantum phases as the interspecies repulsion is increased. In particular, we analyze the low-energy "quantum emulsion" metastable states occurring at large values of the interspecies interaction, which are expected to prevent the system from reaching its true ground state. We argue a significant decrease in the visibility of the time-of-flight images in the case of these spontaneously disordered states.

10 pages, 2 figures - to appear in the topical issue on "Novel Quantum Phases and Mesoscopic Physics in Quantum Gases" of the European Physical Journal B (2009)

References in corpus (12)

• Degenerate Bose-Bose mixture in a three-dimensional optical lattice
• Mixtures of Bosonic and Fermionic Atoms in Optical Lattices
• Interference pattern and visibility of a Mott insulator
• Spatial correlations of trapped 1d bosons in an optical lattice
• High-Temperature Atomic Superfluidity in Lattice Boson-Fermion Mixtures
• Mixtures of strongly interacting bosons in optical lattices
• Spin-1 bosons with coupled ground states in optical lattices
• Some remarks on the coherent-state variational approach to nonlinear boson models
• Mean-field phase diagram of cold lattice bosons in disordered potentials
• Theory of correlations between ultra-cold bosons released from an optical lattice
• First- and second-order superfluid--Mott-insulator phase transitions of spin-1 bosons with coupled ground states in optical lattices
• Glassy features of a Bose Glass