We study the effect of quantum fluctuations on the multiphase point of the Heisenberg model with first- and second-neighbor competing interactions and strong uniaxial spin anisotropy D. By studying the structure of perturbation theory we show that the multiphase degeneracy which exists for S = infinity (i.e., for the axial next-nearest-neighbor Ising model) is lifted and that the effect of quantum fluctuations is to stabilize a. sequence of phases of wavelength 4,6,8,... . This sequence is probably an infinite one. We also show that quantum fluctuations can mediate an infinite sequence of layering transitions through which an interface can unbind from a wall.

LIFTING OF MULTIPHASE DEGENERACY BY QUANTUM FLUCTUATIONS

Micheletti, Cristian;
1995-01-01

Abstract

We study the effect of quantum fluctuations on the multiphase point of the Heisenberg model with first- and second-neighbor competing interactions and strong uniaxial spin anisotropy D. By studying the structure of perturbation theory we show that the multiphase degeneracy which exists for S = infinity (i.e., for the axial next-nearest-neighbor Ising model) is lifted and that the effect of quantum fluctuations is to stabilize a. sequence of phases of wavelength 4,6,8,... . This sequence is probably an infinite one. We also show that quantum fluctuations can mediate an infinite sequence of layering transitions through which an interface can unbind from a wall.
1995
52
9
6684
6705
Harris, Ab; Micheletti, Cristian; Yeomans, Jm
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/12188
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