Incommensuration in quantum antiferromagnetic chain

Bhattacharjee, Somendra M. ; Mukherji, Sutapa (1998) Incommensuration in quantum antiferromagnetic chain Journal of Physics A: Mathematical and General, 31 (40). L695-L700. ISSN 0305-4470

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Official URL: http://iopscience.iop.org/0305-4470/31/40/001

Related URL: http://dx.doi.org/10.1088/0305-4470/31/40/001

Abstract

A dimerized quantum Heisenberg or XY antiferromagnetic chain has a gap in the spectrum. We show that a weak incommensurate modulation around a dimerized chain produces a zero-temperature quantum critical point. As the incommensuration wavelength is varied, there is a transition to a modulated gapless state. The critical behaviour is in the universality class of the classical commensurate-incommensurate (Pokrovsky-Talapov) transition. An analogous metal-insulator transition can also take place for an incommensurate chain.

Item Type:Article
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ID Code:2999
Deposited On:09 Oct 2010 10:23
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