Nonlinear $σ$-Model in (2+1) dimensions

Details Nonlinear $σ$-Model in (2+1) dimensions Nonlinear $σ$-Model in (2+1) dimensions

2008-09-09

arxiv.org/abs/0809.1655v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

12 pages

Scientific paper

The nonlinear $\sigma$-model in (2+1) dimensions admits topological configurations called skyrmions. The topological charge of skyrmions turn out to be the fermionic number and the fermionic current is dictated by the skyrmion field configuration. The peculiar feature of this model is that a Hopf term introduced into the Lagrangian can lead to exotic spin and fractional statistics.

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