Particle-hole-symmetric model for a paired fractional quantum Hall state in a half-filled Landau level. Hutzel, W., McCord, J., J., Raum, P., T., Stern, B., Wang, H., Scarola, V., W., & Peterson, M., R. Physical Review B, 99(4):045126, American Physical Society, 1, 2019.
Particle-hole-symmetric model for a paired fractional quantum Hall state in a half-filled Landau level [pdf]Paper  Particle-hole-symmetric model for a paired fractional quantum Hall state in a half-filled Landau level [link]Website  doi  abstract   bibtex   3 downloads  
The fractional quantum Hall effect (FQHE) observed at half filling of the second Landau level is believed to be caused by a pairing of composite fermions (CFs) captured by the Moore-Read Pfaffian wave function. The generating Hamiltonian for the Moore-Read Pfaffian is a purely three-body model that breaks particle-hole symmetry and lacks other properties, such as dominate two-body repulsive interactions, expected from a physical model of the FQHE. We use exact diagonalization to study the low energy states of a more physical two-body generator model derived from the three-body model. We find that the two-body model exhibits the essential features expected from the Moore-Read Pfaffian: pairing, non-Abelian anyon excitations, and a neutral fermion mode. The model also satisfies constraints expected for a physical model of the FQHE at half-filling because it is: short range, spatially decaying, particle-hole symmetric, and supports a roton mode with a robust spectral gap in the thermodynamic limit. Hence, this two-body model offers a bridge between artificial three-body generator models for paired states and the physical Coulomb interaction and can be used to further explore properties of non-Abelian physics in the FQHE.

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