Exciton condensation and charge fractionalization in a topological insulator film

Details Exciton condensation and charge fractionalization in a topological insulator film Exciton condensation and charge fractionalization in a topological insulator film

2009-02-06

arxiv.org/abs/0902.1147v2

Phys. Rev. Lett. 103, 066402 (2009).

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 1 figure, version to appear in PRL (minor stylistic changes). For related work and info visit http://www.physics.ubc.

Scientific paper

10.1103/PhysRevLett.103.066402

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 coherent exciton condensate, similar in general terms to the exciton condensate recently argued to exist in a biased graphene bilayer, but with different topological properties. Such a `topological' exciton condensate (TEC) exhibits a host of unusual properties; the most interesting among them is the fractional charge +-e/2 carried by a singly quantized vortex in the TEC order parameter.

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