Journal
PHYSICAL REVIEW LETTERS
Volume 103, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.103.066402
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Funding
- NSERC
- CIfAR
- NSF
- ICMT
- UIUC
- Killam Foundation
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An odd number of gapless Dirac fermions is guaranteed to exist at a surface of a strong topological insulator. We show that in a thin-film geometry and under external bias, electron-hole pairs that reside in these surface states can condense to form a novel exotic quantum state which we propose to call topological exciton condensate (TEC). This TEC is similar in general terms to the exciton condensate recently argued to exist in a biased graphene bilayer, but with different topological properties. It exhibits a host of unusual properties including a stable zero mode and a fractional charge +/- e/2 carried by a singly quantized vortex in the TEC order parameter.
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