Title:	Shape-deformation-driven structural transitions in quantum hall skyrmions
Authors:	Rao, Madan Sengupta, Surajit Shankar, R.
Issue Date:	1997
Publisher:	American Physical Society
Citation:	Physical Review Letters, 1997, Vol.79, p3998
Abstract:	The quantum Hall ground state away from ν = 1 can be described by a collection of interacting Skyrmions. We show within the context of a nonlinear sigma model that the classical ground state away from ν = 1 is a Skyrmion crystal with a generalized Néel order. As a function of filling factor ν and Landé factor g, the Skyrmion crystal undergoes a triangle --> square --> triangle transition at zero temperature. We argue that this structural transition is driven by a change in the shape of the individual Skyrmions and may be probed experimentally. Quantum fluctuations lead to an orientationally disordered phase at low Skyrmion densities.
Description:	Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)
URI:	http://hdl.handle.net/2289/4567
ISSN:	0031-9007 1079-7114 (Onnline)
Alternative Location:	http://arxiv.org/abs/cond-mat/9702193 http://dx.doi.org/10.1103/PhysRevLett.79.3998 http://adsabs.harvard.edu/abs/1997PhRvL..79.3998R
Copyright:	1997, American Physical Society
Appears in Collections:	Research Papers (TP)

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