Volume 89, Number 1, January 2010
|Number of page(s)||6|
|Published online||13 January 2010|
Universal phase diagram of disordered bosons from a doped quantum magnet
Department of Physics and Astronomy, Rice University - Houston, TX 77005, USA
2 Department of Physics and Astronomy, University of Southern California - Los Angeles, CA 90089-0484, USA
3 Laboratoire de Physique, Ecole Normale Supérieure de Lyon - 46 Allée d'Italie, 69007 Lyon, France, EU
4 Max-Planck-Institut für Quantenoptik - Hans-Kopfermann-strasse 1, 85748 Garching, Germany, EU
Corresponding author: firstname.lastname@example.org
Accepted: 18 December 2009
A quantum particle cannot in general diffuse through a disordered medium because of its wavelike nature, but interacting particles can escape localization by collectively percolating through the system. For bosonic particles this phenomenon corresponds to a quantum transition from a localized insulator phase —the Bose glass— to a superfluid phase, in which particles condense into an extended state. Here, we construct a universal phase diagram of disordered bosons in doped quantum magnets for which bosonic quasiparticles are represented by magnetized states (spin triplets) of the quantum spins, condensing into a magnetically ordered state. The appearance of a Bose glass leads to strong measurable signatures in the onset of superfluidity of the spin-triplet gas, exhibiting a complex crossover from low-temperature quantum percolation to a conventional condensation transition at intermediate temperatures.
PACS: 03.75.Lm – Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices and topological excitations / 72.15.Rn – Localization effects (Anderson or weak localization) / 75.10.Jm – Quantized spin models, including quantum spin frustration
© EPLA, 2010
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