title: Permutation-symmetric multicritical points in random antiferromagnetic spin chains.
abstract: 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.
authors.affiliation: Physics Department, Harvard University, Cambridge, MA 02138, USA.
authors.forename: Kedar
authors.initials: K
authors.lastname: Damle
authors.forename: David A
authors.initials: DA
authors.lastname: Huse