Journal
PHYSICAL REVIEW B
Volume 85, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.85.235146
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Funding
- College of Arts and Sciences at Indiana University, Bloomington
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I study the effects of particle-hole imbalance on the exciton superfluid formed in a topological insulator thin film and obtain the mean-field phase diagram. At finite imbalance a spatially modulated condensate is formed, akin to the Fulde-Ferrell-Larkin-Ovchinnikov state in a superconductor, which preempts a first-order transition from the uniform condensate to the normal state at low temperatures. The imbalance can be tuned by changing the chemical potential at the two surfaces separately or, alternatively, by an asymmetric application of Zeeman fields at constant chemical potential. A vortex in the condensate carries a precisely fractional charge half of that of an electron. Possible experimental signatures for realistic parameters are discussed.
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