Bosonic topological phase in a paired superfluid

Snir Gazit, Ashvin Vishwanath

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


We study an effective model of two interacting species of bosons in two dimensions, which is amenable to sign problem free Monte Carlo simulations. In addition to conventional ground states, we access a paired superfluid which is also a topological phase, protected by the remaining U(1)×Z2 symmetry. This phase arises from the condensation of a composite object, the bound state of vortices and antivortices of one species, to a boson of the second species. We introduce a bulk response function, the Ising analog of the quantized Hall effect, to diagnose the topological phase. The interplay of broken symmetry and topology leads to interesting effects such as fractionally charged vortices in the paired superfluid. Possible extensions towards realistic models of cold atomic bosons are discussed.

Original languageAmerican English
Article number115146
JournalPhysical Review B
Issue number11
StatePublished - 30 Mar 2016
Externally publishedYes

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Publisher Copyright:
© 2016 American Physical Society.


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