Interaction-induced chiral px ± ipy superfluid order of bosons in an optical lattice

M. Ölschläger, T. Kock, G. Wirth, A. Ewerbeck, C. de Morais Smith, A. Hemmerich

Research output: Contribution to journalArticleAcademicpeer-review


The study of superconductivity with unconventional order is complicated in condensed matter systems by their extensive complexity. Optical lattices with their exceptional precision and control allow one to emulate superfluidity avoiding many of the complications of condensed matter. A promising approach to realize unconventional superfluid order is to employ orbital degrees of freedom in higher Bloch bands. In recent work, indications were found that bosons condensed in the second band of an optical chequerboard lattice might exhibit px ± i py order. Here we present experiments, which provide strong evidence for the emergence of px ± i py order driven by the interaction in the local p-orbitals. We compare our observations with a multi-band Hubbard model and find excellent quantitative agreement.
Original languageEnglish
Article number083041
Pages (from-to)083041/1-083041/15
Number of pages15
JournalNew Journal of Physics
Issue number8
Publication statusPublished - 2013


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