Permutation-Symmetric Multicritical Points in Random Antiferromagnetic Spin Chains
arXiv:cond-mat/0207244 · doi:10.1103/PhysRevLett.89.277203
Abstract
The low-energy properties of a system at a critical point may have additional symmetries not present in the microscopic Hamiltonian. This letter presents the theory of a class of multicritical points that provide an interesting example of this in the phase diagrams of random antiferromagnetic spin chains. One case provides an analytic theory of the quantum critical point in the random spin-3/2 chain, studied in recent work by Refael, Kehrein and Fisher (cond-mat/0111295).
Revtex, 4 pages (2 column format), 2 eps figures
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