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arXiv 0910.1322cond-mat.str-elcond-mat.dis-nn
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掺杂量子磁体中无序玻色子的普适phase diagram

Universal phase diagram of disordered bosons from a doped quantum magnet

Rong Yu, Stephan Haas, Tommaso Roscilde

摘要:

由于量子粒子的波动性质,它一般不能在无序介质中扩散,但相互作用的粒子可以通过集体扩散通过系统来逃避定域。对于玻色子粒子,这种现象对应于从局部绝缘体相(玻色玻璃)到超流相的量子跃迁,在超流相中粒子凝聚成扩展态。在这里,我们构建了一个通用的相位图的无序玻色子在掺杂的量子磁体的玻色子准粒子表示的磁化状态(自旋三重态)的量子自旋,凝聚成磁有序状态。玻色玻璃的出现导致自旋三重态气体的超流性开始时出现强烈的可测量特征,表现出从低温量子渗流到中间温度下常规冷凝转变的复杂交叉。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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