Approximate two-body generating Hamiltonian for the PH-Pfaffian wavefunction

Abstract

We present two 2-body Hamiltonians that approximate the exact PH-Pfaffian wavefunction with their ground states for all the system sizes where this wavefunction has been numerically constructed to date. The approximate wavefunctions have high overlap with the original and reproduce well the low-lying entanglement spectrum and structure factor. The approximate generating Hamiltonians are obtained by an optimisation procedure where three to four pseudopotentials are varied in the neighbourhood of second Landau level Coulomb interaction or of a non-interacting model. They belong to a finite region in the variational space of Hamiltonians where each point approximately generates the PH-Pfaffian. We diagonalize the identified Hamiltonians for up to 20 electrons and find that for them the PH-Pfaffian shift appears energetically more favorable. Possibility to interpret the data in terms of composite fermions is discussed.

v3: journal version. Added various definitions to make the paper self-contained. Improved presentation incl. clearer plots

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Cited by in corpus (4)

• Fractional quantum Hall effect at the filling factor $\nu =5/2$
• Energy minimization of paired composite fermion wave functions in the spherical geometry
• From frustration-free parent Hamiltonians to off-diagonal long-range order: Moore-Read and related states in second quantization
• Non-Hermitian Parent Hamiltonian from Generalized Quantum Covariance Matrix