Universal phase diagram of disordered bosons from a doped quantum magnet

2009/10/07 by Rong Yu, Stephan Haas, Tommaso Roscilde · 1 citation
Physics and Astronomy · #cond-mat.dis-nn #cond-mat.str-el

paper · pdf · doi:10.1209/0295-5075/89/10009

published as Europhys. Lett. 89, 10009 (2010) · 4 pages, 4 figures

arxiv created 2009/10/07 · arxiv updated 2010/03/23

Abstract

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 quasi-particles 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.

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