Non-quantized Dirac monopoles and strings in the Berry phase of anisotropic spin systems

Details Non-quantized Dirac monopoles and strings in the Berry phase of anisotropic spin systems Non-quantized Dirac monopoles and strings in the Berry phase of anisotropic spin systems

2004-04-26

arxiv.org/abs/cond-mat/0404616v2

Phys.Rev.Lett. 93 (2004) 247202; Erratum-ibid. 94 (2005) 239903

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures (RevTeX + eps); v2 (revised paper): 4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.93.247202

The Berry phase of an anisotropic spin system that is adiabatically rotated along a closed circuit C is investigated. It is shown that the Berry phase consists of two contributions: (i) a geometric contribution which can be interpreted as the flux through C of a non-quantized Dirac monopole, and (ii) a topological contribution which can be interpreted as the flux through C of a Dirac string carrying a non-quantized flux, i.e., a spin analogue of the Aharonov-Bohm effect. Various experimental consequences of this novel effect are discussed.

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