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Bose–Einstein condensation versus localization of bosonic quasiparticles in disordered weakly-coupled dimer antiferromagnets

Tommaso Roscilde1,2 and Stephan Haas1

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We investigate the field-induced insulator-to-superfluid transition of bosonic quasiparticles in S = 1/2 weakly-coupled dimer antiferromagnets. In the presence of realistic disorder due to site dilution of the magnetic lattice, we show that the system displays an extended Bose-glass phase characterized by the localization of the hard-core quasiparticles.


PACS

75.30.Kz Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)

05.30.Jp Boson systems

75.50.Ee Antiferromagnetics

75.10.Jm Quantized spin models

Subjects

Quantum gases, liquids and solids

Condensed matter: electrical, magnetic and optical

Statistical physics and nonlinear systems

Dates

Issue 10 (28 May 2006)

Received 12 January 2005, in final form 23 January 2006

Published 2 May 2006



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