Bose-Einstein condensation vs. localization of bosonic quasiparticles in disordered weakly-coupled dimer antiferromagnets

Abstract

We investigate the field-induced insulator-to-superfluid transition of bosonic quasiparticles in $S=1/2$ weakly-coupled dimer antiferromagnets. In 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.

arXiv comment12 pages, 4 figures. Contribution to the BEC Cortona Workshop 2005

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Cited by in corpus (6)

• Field-induced quantum disordered phases in S=1/2 weakly-coupled dimer systems with site dilution
• Magnetic Bose glass phases of coupled antiferromagnetic dimers with site dilution
• Competing Bose-Glass physics with disorder-induced Bose-Einstein condensation in the doped $S=1$ antiferromagnet Ni(Cl${}_{1-x}$Br${}_x$)${}_2$-4SC(NH${}_2$)${}_2$ at high magnetic fields
• Dirty bosons on the Cayley tree: Bose-Einstein condensation versus ergodicity breaking
• The effects of disorder in dimerized quantum magnets in mean field approximations
• Numerical study of the temperature dependence of the NMR relaxation rate across the superfluid-Bose glass transition in one dimension