Universal critical temperature for Kosterlitz-Thouless transitions in bilayer quantum magnets

Details Universal critical temperature for Kosterlitz-Thouless transitions in bilayer quantum magnets Universal critical temperature for Kosterlitz-Thouless transitions in bilayer quantum magnets

1998-07-30

arxiv.org/abs/cond-mat/9807393v3

Phys.Rev.Lett. 81 (1998) 5418

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.81.5418

Recent experiments show that double layer quantum Hall systems may have a ground state with canted antiferromagnetic order. In the experimentally accessible vicinity of a quantum critical point, the order vanishes at a temperature T_{KT} = \kappa H, where H is the magnetic field and \kappa is a universal number determined by the interactions and Berry phases of the thermal excitations. We present quantum Monte Carlo simulations on a model spin system which support the universality of \kappa and determine its numerical value. This allows experimental tests of an intrinsically quantum-mechanical universal quantity, which is not also a property of a higher dimensional classical critical point.

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