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Almost linear Haldane pseudopotentials and emergent conformal block wave functions in a Landau level

TitleAlmost linear Haldane pseudopotentials and emergent conformal block wave functions in a Landau level
Publication TypeJournal Article
Year of Publication2019
AuthorsY. Alavirad
JournalPhys. Rev. B
Volume100
Pagination075122
Date PublishedAUG 12
Type of ArticleArticle
ISSN2469-9950
Abstract

We consider a two-dimensional model of particles interacting in a Landau level. We work in a finite disk geometry and take the particles to interact with a linearly decreasing two-body Haldane pseudopotential. We show that the ground-state subspace of this model is spanned by the wave functions that can be written as polynomial conformal blocks (of an arbitrary conformal field theory) consistent with the filling fraction (scaling dimension). To remove degeneracies, we then add a quadratic perturbation to the Hamiltonian and show that (1) conformal blocks constructed using the Moore-Read construction (e.g., Laughlin, Pfaffian, and Read-Rezayi states) remain exact eigenstates of this model in the thermodynamic limit, and (2) by tuning an externally imposed single-body -L-z(2) potential we can enforce Moore-Read conformal blocks to become exact ground states of this model in the thermodynamic limit. We cannot rule out the possibility of residual degeneracies in this limit. This model has no filling dependence and is comprised only from two-body long-range interactions and external single-body potentials. Our results provide insight into how conformal block wave functions can emerge in a Landau level.

DOI10.1103/PhysRevB.100.075122