Non-linear Field Theory of a Frustrated Heisenberg Spin Chain

Rao, Sumathi and Sen, Diptiman (1992) Non-linear Field Theory of a Frustrated Heisenberg Spin Chain. [Preprint]

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Abstract

We derive a continuum field theory for the Majumdar-Ghosh model in the large-S limit, where the field takes values in the manifold of the SO(3) group. No topological term is induced in the action and the cases for integer spin and half-integer spin appear to be indistinguishable. A one loop beta -function calculation indicates that the theory flows towards a strong coupling (disordered) phase at long distances. This is verified in the large-N limit, where all excitations are shown to be massive. (Three figures not included)

Item Type:	Preprint
Additional Information:	Nucl. Phys. B424 (1994) 547
Department/Centre:	Division of Physical & Mathematical Sciences > Centre for Theoretical Studies (Ceased to exist at the end of 2003)
Date Deposited:	13 Aug 2004
Last Modified:	19 Sep 2010 04:13
URI:	http://eprints.iisc.ac.in/id/eprint/922

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