Microscopic diagnosis of universal geometric responses in fractional quantum Hall liquids

Liangdong Hu, Zhao Liu, D. N. Sheng, F. D.M. Haldane, W. Zhu

Research output: Contribution to journalArticlepeer-review

Abstract

Topological quantum liquids contain internal degrees of freedom that are coupled to geometric response. Yet, an explicit and microscopic identification of the geometric response remains difficult. Here, taking notable fractional quantum Hall (FQH) states as typical examples, we systematically investigate a promising protocol - the Dehn-twist deformation on the torus geometry - to probe the geometric response of correlated topological states and establish the relation between such response and universal properties of pertinent states. Based on analytical derivations and numerical simulations, we find that the geometry-induced Berry phase encodes features for a broad class of FQH states at the Laughlin, hierarchy, Halperin and non-Abelian Moore-Read fillings. Our findings conclusively demonstrate that the adiabatic Dehn-twist deformation can faithfully capture rich geometric and topological information, including the Hall viscosity and topological spin of the pertinent FQH state and the chiral central charge of the underlying edge conformal field theory. Our approach provides a powerful way to reveal topological orders of generic FQH states and address previously open questions.

Original languageEnglish (US)
Article number085103
JournalPhysical Review B
Volume103
Issue number8
DOIs
StatePublished - Feb 2 2021

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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