APS » PROLA » Phys. Rev. Lett. » Volume 89 » Issue 27

Phys. Rev. Lett. 89, 277203 (2002) [4 pages]

Permutation-Symmetric Multicritical Points in Random Antiferromagnetic Spin Chains

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Kedar Damle1,2 and David A. Huse3
1Physics Department, Harvard University, Cambridge, Massachusetts 02138
2Department of Physics and Astronomy, Rice University, Houston, Texas 77005
3Physics Department, Princeton University, Princeton, New Jersey 08544

Received 11 July 2002; published 20 December 2002

We present a general theory of a class of multicritical points in the phase diagrams of random antiferromagnetic spin chains. We show that low-energy properties of these points are almost completely determined by a permutation symmetry of the effective theory not shared by the microscopic Hamiltonian. One case provides an analytic theory of the quantum critical point in the random spin-3/2 chain, studied in a recent work by Refael, Kehrein, and Fisher.


©2002 The American Physical Society

URL: http://link.aps.org/abstract/PRL/v89/e277203
DOI: 10.1103/PhysRevLett.89.277203
PACS: 75.10.Jm, 64.60.Kw, 75.50.Ee

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