Manifestations of topological band crossings in bulk entanglement spectrum: An analytical study for integer quantum Hall states

Chi Ken Lu, Dah Wei Chiou, Feng Li Lin

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We consider integer quantum Hall states and calculate the bulk entanglement spectrum by formulating the correlation matrix in the guiding center representation. Our analytical approach is based on the strategy of redefining the inner product of states in the Hilbert space, via a projection operator, to take care of the restriction imposed by the (rectangle-pixeled) checkerboard partition. The resultant correlation matrix contains various couplings between states of different guiding centers parameterized by the magnetic length and the pixel size. Given a fixed magnetic field, we find various patterns of band crossings by tuning the pixel size (quantified by the flux Φ threading each pixel) and by changing the filling factor ν N (determined by the Fermi level). When ν=1 and Φ=2π, or ν=2 and Φ=π, one Dirac band crossing is found. For ν=1 and Φ=π, the band crossings are in the form of a nodal line, enclosing the Brillouin zone. As for ν=2 and Φ=2π, the doubled Dirac point, or the quadratic point, is seen. Additionally, we infer that the quadratic point is protected by the C4 symmetry of the pixel since it evolves into two separate Dirac points when the symmetry is lowered to C2. We also identify the emerging symmetries responsible for the symmetric bulk entanglement spectra, which are absent in the underlying quantum Hall states.

Original languageEnglish
Article number075130
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number7
DOIs
Publication statusPublished - 2015 Aug 20

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integers
Pixels
pixels
symmetry
rectangles
Hilbert spaces
Hilbert space
Fermi level
Brillouin zones
Mathematical operators
partitions
emerging
constrictions
Tuning
projection
tuning
Magnetic fields
Fluxes
operators
products

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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title = "Manifestations of topological band crossings in bulk entanglement spectrum: An analytical study for integer quantum Hall states",
abstract = "We consider integer quantum Hall states and calculate the bulk entanglement spectrum by formulating the correlation matrix in the guiding center representation. Our analytical approach is based on the strategy of redefining the inner product of states in the Hilbert space, via a projection operator, to take care of the restriction imposed by the (rectangle-pixeled) checkerboard partition. The resultant correlation matrix contains various couplings between states of different guiding centers parameterized by the magnetic length and the pixel size. Given a fixed magnetic field, we find various patterns of band crossings by tuning the pixel size (quantified by the flux Φ threading each pixel) and by changing the filling factor ν N (determined by the Fermi level). When ν=1 and Φ=2π, or ν=2 and Φ=π, one Dirac band crossing is found. For ν=1 and Φ=π, the band crossings are in the form of a nodal line, enclosing the Brillouin zone. As for ν=2 and Φ=2π, the doubled Dirac point, or the quadratic point, is seen. Additionally, we infer that the quadratic point is protected by the C4 symmetry of the pixel since it evolves into two separate Dirac points when the symmetry is lowered to C2. We also identify the emerging symmetries responsible for the symmetric bulk entanglement spectra, which are absent in the underlying quantum Hall states.",
author = "Lu, {Chi Ken} and Chiou, {Dah Wei} and Lin, {Feng Li}",
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AB - We consider integer quantum Hall states and calculate the bulk entanglement spectrum by formulating the correlation matrix in the guiding center representation. Our analytical approach is based on the strategy of redefining the inner product of states in the Hilbert space, via a projection operator, to take care of the restriction imposed by the (rectangle-pixeled) checkerboard partition. The resultant correlation matrix contains various couplings between states of different guiding centers parameterized by the magnetic length and the pixel size. Given a fixed magnetic field, we find various patterns of band crossings by tuning the pixel size (quantified by the flux Φ threading each pixel) and by changing the filling factor ν N (determined by the Fermi level). When ν=1 and Φ=2π, or ν=2 and Φ=π, one Dirac band crossing is found. For ν=1 and Φ=π, the band crossings are in the form of a nodal line, enclosing the Brillouin zone. As for ν=2 and Φ=2π, the doubled Dirac point, or the quadratic point, is seen. Additionally, we infer that the quadratic point is protected by the C4 symmetry of the pixel since it evolves into two separate Dirac points when the symmetry is lowered to C2. We also identify the emerging symmetries responsible for the symmetric bulk entanglement spectra, which are absent in the underlying quantum Hall states.

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