Intertwined superfluidity and density wave order in a p-orbital Bose condensate

Article

关键词: LONG-RANGE ORDER;   

DOI  :  10.1103/PhysRevB.99.014504

来源: SCIE

【 摘 要 】

We study a continuum model of the weakly interacting Bose gas in the presence of an external field with minima forming a triangular lattice. The second lowest band of the single-particle spectrum (p band) has three minima at nonzero momenta. We consider a metastable Bose condensate at these momenta and find that, in the presence of interactions that vary slowly over the lattice spacing, the order parameter space is isomorphic to S-5. We show that the enlarged symmetry leads to the loss of topologically stable vortices, as well as two extra gapless modes with quadratic dispersion. The former feature implies that this non-Abelian condensate is a failed superfluid that does not undergo a Berezinskii-Kosterlitz-Thouless (BKT) transition. Order-by-disorder splitting appears suppressed, implying that signatures of the S-5 manifold ought to be observable at low temperatures.

【 授权许可】

Free