Fractional topological liquids with time-reversal symmetry and their lattice realization

Titus Neupert, Luiz Santos, Shinsei Ryu, Claudio Chamon, Christopher Mudry

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123 Scopus citations

Abstract

We present a class of time-reversal-symmetric fractional topological liquid states in two dimensions that support fractionalized excitations. These are incompressible liquids made of electrons, for which the charge Hall conductance vanishes and the spin Hall conductance needs not be quantized. We then analyze the stability of edge states in these two-dimensional topological fluids against localization by disorder. We find a Z2 stability criterion for whether or not there exists a Kramers pair of edge modes that is robust against disorder. We also introduce an interacting electronic two-dimensional lattice model based on partially filled flattened bands of a Z2 topological band insulator, which we study using numerical exact diagonalization. We show evidence for instances of the fractional topological liquid phase as well as for a time-reversal symmetry broken phase with a quantized (charge) Hall conductance in the phase diagram for this model.

Original languageEnglish (US)
Article number165107
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume84
Issue number16
DOIs
StatePublished - Oct 10 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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