Quantum phase transitions in frustrated quantum antiferromagnets

We study frustrated, two-dimensional, quantum antiferromagnets in the vicinity of a quantum transition from a non-collinear, magnetically ordered ground state to a quantum-disordered phase. The general scaling properties of this transition are described. A detailed study of a particular field-theoretic model of the transition, with bosonic spin - 1 2 spinon fields, is presented. Explicit universal scaling forms for a variety of observables are obtained and the results are compared with numerical data on the spin - 1 2 triangular antiferromagnet. Universal properties of an alternative field theory, with confined spinons, are also briefly noted.

Note:

51 pages, REVTEX 3.0, 5 uuencoded EPS figures appended, YCTP-xxzz

model: ferromagnet
critical phenomena
dimension: 2
scaling
field theory
conservation law
expansion 1/N

References(82)

Figures(0)

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