Fractional topological insulators

Abstract

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 σ_{sH}/e^* is odd, where σ_{sH} is the spin-Hall conductance in units of e/2π, and e^* is the elementary charge in units of e.

4 pages

References in corpus (2)

• Quantum Spin Hall Insulator State in HgTe Quantum Wells
• Time Reversal Polarization and a Z_2 Adiabatic Spin Pump

Cited by in corpus (259)

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• Fractional charge and statistics in the fractional quantum spin Hall effect
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• Exact Mappings in Condensed Matter Physics
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