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Incommensuration in quantum antiferromagnetic chain | | Somendra M. Bhattacharjee
; Sutapa Mukherji
; | | Date: |
20 Aug 1998 | | Subject: | Statistical Mechanics; Strongly Correlated Electrons | cond-mat.stat-mech cond-mat.str-el | | 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. | | Source: | arXiv, cond-mat/9808219 | | Services: | Forum | Review | PDF | Favorites | |
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