Variational Monte Carlo study of spin polarization stability of fractional quantum Hall states against realistic effects in half-filled Landau levels

Abstract

We compare ground state energies by variational Monte Carlo of the spin unpolarized Halperin 331 and the spin polarized Moore-Read (MR) Pfaffian fractional quantum Hall states at half-filling of the lowest Landau level (LLL) and the second Landau level (SLL) as a function of small deviations around the Coulomb point via the finite thickness effect and direct alterations to the the first two Haldane pseudopotentials. In the comparison we find that in the LLL, either the 331 state or the MR Pfaffian may be lower in energy depending on the deviations. In the SLL, however, the MR Pfaffian is consistently lower in energy except for large deviations. These results suggest that even under moderate deviations in the interaction potential (through various physical processes such as finite thickness, Landau level mixing, etc.), the MR Pfaffian description is more energetically favorable than the Halperin 331 state in the half-filled SLL (i.e. $\nu =5/2$), consistent with recent experimental investigations.

9 pages, 4 figures, 1 table

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• Partial equilibration of integer and fractional edge channels in the thermal quantum Hall effect
• Influence of device geometry on tunneling in ν=5/2 quantum Hall liquid
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• Lattice Monte Carlo for Quantum Hall States on a Torus
• Experimental constraints and a possible quantum Hall state at $\nu =5/2$
• Geometric Resonance of Composite Fermions near Bilayer Quantum Hall States
• Fractional quantum Hall states versus Wigner crystals in wide quantum wells in the half-filled lowest and second Landau levels
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• A Particle-Hole-Symmetric Model for a Paired Fractional Quantum Hall State in a Half-filled Landau Level
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• Measurable fractional spin for quantum Hall quasiparticles on the disk
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