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2011

Fractional Chern Insulators and the W-Infinity Algebra

Parameswaran, S. A., Roy, R., Sondhi, S. L.

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A set of recent results indicates that fractionally filled bands of Chern insulators in two dimensions support fractional quantum Hall states analogous to those found in fractionally filled Landau levels.

We provide an understanding of these results by examining the algebra of Chern band projected density operators.
We find that this algebra closes at long wavelengths and for constant Berry curvature, whereupon it is isomorphic to the W-Infinity algebra of lowest Landau level projected densities first identified by Girvin, MacDonald and Platzman [Phys.
Rev.

Fractional Chern Insulators and the W-Infinity Algebra · Around

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