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Approximate Hofstadter- and Kapit-Mueller-like parent Hamiltonians for Laughlin states on fractals

Błażej Jaworowski*, Michael Iversen, and Anne E. B. Nielsen

  • Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark

  • *Corresponding author: blazej.jaworowski@icfo.eu
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Phys. Rev. A 107, 063315 – Published 29 June, 2023

DOI: https://doi.org/10.1103/PhysRevA.107.063315

Abstract

Recently, it was shown that fractional quantum Hall states can be defined on fractal lattices. Proposed exact parent Hamiltonians for these states are nonlocal and contain three-site terms. In this work, we look for simpler, approximate parent Hamiltonians for bosonic Laughlin states at half filling, which contain only onsite potentials and two-site hopping with the interaction generated implicitly by hardcore constraints (as in the Hofstadter and Kapit-Mueller models on periodic lattices). We use an “inverse method” to determine such Hamiltonians on finite-generation Sierpiński carpet and triangle lattices. The ground states of some of the resulting models display relatively high overlap with the model states if up to third-neighbor hopping terms are considered, and by increasing the maximum hopping distance one can achieve nearly perfect overlaps. When the number of particles is reduced and additional potentials are introduced to trap quasiholes, the overlap with a model quasihole wave function is also high in some cases, especially for the nonlocal Hamiltonians. We also study how the small system size affects the braiding properties for the model quasihole wave functions and perform analogous computations for Hamiltonian models.

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Outline

Information

Phys. Rev. A 107, 063315– Published 29 June, 2023
  • Received 2 February 2023
  • Accepted 24 May 2023
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