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Fractional topological insulators · Around

2009

Fractional topological insulators

Levin, Michael, Stern, Ady

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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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B. A. Bernevig and S.-C. Zhang, Phys. Rev. Lett. 96
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