Entanglement Scaling of Fractional Quantum Hall states through Geometric Deformations

Details Entanglement Scaling of Fractional Quantum Hall states through Geometric Deformations Entanglement Scaling of Fractional Quantum Hall states through Geometric Deformations

2010-03-29

arxiv.org/abs/1003.5656v2

New. J. Phys. 12, 075004 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

16 pages, 8 figures, published version

Scientific paper

10.1088/1367-2630/12/7/075004

We present a new approach to obtaining the scaling behavior of the entanglement entropy in fractional quantum Hall states from finite-size wavefunctions. By employing the torus geometry and the fact that the torus aspect ratio can be readily varied, we can extract the entanglement entropy of a spatial block as a continuous function of the block boundary. This approach allows us to extract the topological entanglement entropy with an accuracy superior to what is possible on the spherical or disc geometry, where no natural continuously variable parameter is available. Other than the topological information, the study of entanglement scaling is also useful as an indicator of the difficulty posed by fractional quantum Hall states for various numerical techniques.

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