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yexuqing木蟲之王 (文學(xué)泰斗)
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關(guān)于玻色玻璃相的思考 已有3人參與
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關(guān)于玻色玻璃相的思考 發(fā)表日期：2012年9月20日 玻色-愛因斯坦凝聚(BEC)和超流動(dòng)性是已經(jīng)被研究很多的“玻色子系綜”在低溫下可以表現(xiàn)出來的異常宏觀量子力學(xué)狀態(tài)的例子。我們所不太熟悉的是“玻璃”態(tài)，這種狀態(tài)據(jù)預(yù)測(cè)在無序存在時(shí)會(huì)對(duì)相互作用的玻色子出現(xiàn)，但迄今為止在實(shí)驗(yàn)中卻沒有觀測(cè)到�，F(xiàn)在，Rong Yu等人發(fā)現(xiàn)，一種摻雜的量子磁體中的磁激發(fā)非常適合實(shí)現(xiàn)和研究這種行為。（Link to Article p. 379） doi: 10.1038/nature11406 Bose glass and Mott glass of quasiparticles in a doped quantum magnet Rong Yu1 Liang Yin2 Neil S. Sullivan2 J. S. Xia2 Chao Huan2 Armando Paduan-Filho3 Nei F. Oliveira Jr3 Stephan Haas4 Alexander Steppke5 Corneliu F. Miclea6, 7 Franziska Weickert6 Roman Movshovich6 Eun-Deok Mun6 Brian L. Scott6 Vivien S. Zapf6 Tommaso Roscilde8 Affiliations Contributions Corresponding author Journal name: Nature Volume: 489, Pages: 379–384 Date published: (20 September 2012) DOI: doi:10.1038/nature11406 Received 14 May 2012 Accepted 11 July 2012 Published online 19 September 2012 The low-temperature states of bosonic fluids exhibit fundamental quantum effects at the macroscopic scale: the best-known examples are Bose–Einstein condensation and superfluidity, which have been tested experimentally in a variety of different systems. When bosons interact, disorder can destroy condensation, leading to a ‘Bose glass’. This phase has been very elusive in experiments owing to the absence of any broken symmetry and to the simultaneous absence of a finite energy gap in the spectrum. Here we report the observation of a Bose glass of field-induced magnetic quasiparticles in a doped quantum magnet (bromine-doped dichloro-tetrakis-thiourea-nickel, DTN). The physics of DTN in a magnetic field is equivalent to that of a lattice gas of bosons in the grand canonical ensemble; bromine doping introduces disorder into the hopping and interaction strength of the bosons, leading to their localization into a Bose glass down to zero field, where it becomes an incompressible Mott glass. The transition from the Bose glass (corresponding to a gapless spin liquid) to the Bose–Einstein condensate (corresponding to a magnetically ordered phase) is marked by a universal exponent that governs the scaling of the critical temperature with the applied field, in excellent agreement with theoretical predictions. Our study represents a quantitative experimental account of the universal features of disordered bosons in the grand canonical ensemble. http://www.nature.com/nature/jou ... pdf/nature11406.pdf [ Last edited by yexuqing on 2012-9-21 at 13:06 ] |
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