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Universal critical temperature for Kosterlitz-Thouless transitions in bilayer quantum magnets | | Matthias Troyer
; Subir Sachdev
; | | Date: |
30 Jul 1998 | | Journal: | Phys. Rev. Lett. 81, 5418 (1998) | | Subject: | Strongly Correlated Electrons; Mesoscopic Systems and Quantum Hall Effect; Statistical Mechanics; Computational Physics | cond-mat.str-el cond-mat.mes-hall cond-mat.stat-mech hep-lat physics.comp-ph | | Abstract: | 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. | | Source: | arXiv, cond-mat/9807393 | | Services: | Forum | Review | PDF | Favorites | |
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