Unconventional quantum phases in lattice bosonic mixtures

Year: 2009

Authors: Buonsante P., Giampaolo S.M., Illuminati F., Penna V., Vezzani F.

Autors Affiliation: Politecn Torino, CNISM, I-10129 Turin, Italy; Politecn Torino, Dipartimento Fis, I-10129 Turin, Italy; Univ Salerno, Dipartimento Matemat & Informat, I-84084 Fisciano, SA, Italy; CNISM, Unita Salerno, Baronissi, SA, Italy; Grp Coll Salerno, Sez Napoli, Ist Nazl Fis Nucl, Baronissi, SA, Italy; CNR, INFM Coherentia, I-80125 Naples, Italy; Inst Sci Interchange, I-10133 Turin, Italy; CNR, INFM, Natl Res Ctr, I-41100 Modena, Italy; Univ Parma, Dipartimento Fis, I-43100 Parma, Italy

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.

Journal/Review: EUROPEAN PHYSICAL JOURNAL B

Volume: 68 (3)      Pages from: 427  to: 433

KeyWords: ultracold atoms; optical lattices; bosonic mixture; quantum phases;
DOI: 10.1140/epjb/e2009-00056-0

Citations: 8
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