Fractional topological insulators

Details Fractional topological insulators Fractional topological insulators

2009-06-15

arxiv.org/abs/0906.2769v2

Phys. Rev. Lett. 103, 196803 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages

Scientific paper

10.1103/PhysRevLett.103.196803

We analyze generalizations of two dimensional topological insulators which can be realized in interacting, time reversal invariant electron systems. These states, which we call fractional topological insulators, contain excitations with fractional charge and statistics in addition to protected edge modes. In the case of s^z conserving toy models, we show that a system is a fractional topological insulator if and only if \sigma_{sH}/e^* is odd, where \sigma_{sH} is the spin-Hall conductance in units of e/2\pi, and e^* is the elementary charge in units of e.

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