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Title: Probing the geometry of the Laughlin state

Journal Article · · New Journal of Physics
 [1];  [2];  [3];  [1];  [1]
  1. Princeton Univ., Princeton, NJ (United States)
  2. Univ. of Leeds, Leeds (United Kingdom)
  3. Karlsruhe Institute of Technology, Eggenstien-Leopoldshafen (Gemany); Heinrich-Heine-Univ., Dusseldorf (Germany)

It has recently been pointed out that phases of matter with intrinsic topological order, like the fractional quantum Hall states, have an extra dynamical degree of freedom that corresponds to quantum geometry. Here we perform extensive numerical studies of the geometric degree of freedom for the simplest example of fractional quantumHall states—the filling v = 1/3 Laughlin state.We perturb the system by a smooth, spatially dependent metric deformation and measure the response of the Hall fluid, finding it to be proportional to the Gaussian curvature of the metric. Further, we generalize the concept of coherent states to formulate the bulk off-diagonal long range order for the Laughlin state, and compute the deformations of the metric in the vicinity of the edge of the system. We introduce a ‘pair amplitude’ operator and show that it can be used to numerically determine the intrinsic metric of the Laughlin state. Furthermore, these various probes are applied to several experimentally relevant settings that can expose the quantum geometry of the Laughlin state, in particular to systems with mass anisotropy and in the presence of an electric field gradient.

Research Organization:
Princeton Univ., NJ (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0002140
OSTI ID:
1255131
Journal Information:
New Journal of Physics, Vol. 18, Issue 2; ISSN 1367-2630
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 28 works
Citation information provided by
Web of Science

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Cited By (5)

Numerical study of anisotropy in a composite Fermi liquid text January 2017
Chiral Gravitons in Fractional Quantum Hall Liquids text January 2019
Interaction-dependent anisotropy of fractional quantum Hall states text January 2019
Liouville perturbation theory for Laughlin state and Coulomb gas text January 2020
On the Laughlin function and its perturbations journal July 2019

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