Dolan, Brian P. and Hunter-McCabe, Aonghus (2020) Ground state wave functions for the quantum Hall effect on a sphere and the Atiyah-Singer index theorem. Working Paper. arXiv.

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Abstract

The quantum Hall effect is studied in a spherical geometry using the Dirac operator for non-interacting fermions in a background magnetic field, which is supplied by a Wu-Yang magnetic monopole at the centre of the sphere. Wave functions are cross-section of a non-trivial U(1) bundle, the zero point energy then vanishes and no perturbations can lower the energy. The Atiyah-Singer index theorem constrains the degeneracy of the ground state. The fractional quantum Hall effect is also studied in the composite Fermion model. Vortices of the statistical gauge field are supplied by Dirac strings associated with the monopole field. A unique ground state is attained only if the vortices have an even number of flux units and act to counteract the background field, reducing the effective field seen by the composite fermions. There is a unique gapped ground state and, for large particle numbers, fractions ν=12k+1 are recovered.

Item Type:	Monograph (Working Paper)
Additional Information:	This is the preprint version of the published article which is available at Brian P Dolan and Aonghus Hunter-McCabe 2020 J. Phys. A: Math. Theor. 53 215306
Keywords:	Ground state wave functions; quantum Hall effect; sphere; Atiyah-Singer index theorem;
Academic Unit:	Faculty of Science and Engineering > Theoretical Physics
Item ID:	14825
Identification Number:	https://doi.org/10.1088/1751-8121/ab85e1
Depositing User:	Dr. Brian Dolan
Date Deposited:	15 Sep 2021 14:45
Publisher:	arXiv
URI:	Publisher
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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