Fractional Topological Insulators: from sliding Luttinger Liquids to Chern-Simons theory

Abstract

The sliding Luttinger liquids (LL) approach is applied to study fractional topological insulators (FTI). We show that FTI is the low energy fixed point of the theory for realistic spin-orbit and electron-electron interaction. We find that the topological phase pertains in the presence of interaction that breaks the spin invariance and its boundaries are even extended by those terms. Finally we show that one dimensional chiral anomaly in the LL leads to the emergence of topological Chern-Simons terms in the effective gauge theory of the FTI state.

arXiv comment15 pages, 6 figures. Changes in style. Supplementary material expanded. Added references

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