Evidence for a floating phase of the transverse ANNNI model at high frustration

Details Evidence for a floating phase of the transverse ANNNI model at high frustration Evidence for a floating phase of the transverse ANNNI model at high frustration

2007-02-28

arxiv.org/abs/cond-mat/0702676v2

Physics

Condensed Matter

Statistical Mechanics

20 pages, 16 figures. Major revision: numerical evidence improved, presentation clarified, discussion on KT phase transitions

Scientific paper

10.1103/PhysRevB.76.094410

We study the transverse quantum ANNNI model in the region of high frustration (k>0.5) using the DMRG algorithm. We obtain a precise determination of the phase diagram, showing clear evidence for the existence of a floating phase, separated from the paramagnetic modulated phase by a high-order critical line ending at the multicritical point. We obtain simple and accurate formulae for the two critical lines.

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