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 conserving toy models, we show that a system is a fractional topological insulator if and only if is odd, where is the spin-Hall conductance in units of , and is the elementary charge in units of .
- Received 19 June 2009
DOI:https://doi.org/10.1103/PhysRevLett.103.196803
©2009 American Physical Society