arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1403.4258cond-mat.str-el
收藏

金属与量子自旋液体之间的连续Mott跃迁

A continuous Mott transition between a metal and a quantum spin liquid

Ryan V. Mishmash, Ivan Gonzalez, Roger G. Melko, Olexei I. Motrunich, Matthew P. A. Fisher

摘要:

在内维尔·莫特爵士首次提出半个多世纪后,相互作用驱动的电子金属-绝缘体转变是否可能是连续的这个看似简单的问题仍然是个谜。最近在二维材料上的实验表明,当绝缘体是量子自旋液体时,在绝缘侧缺乏磁性长程序可能导致跃迁是连续的,或者只有非常弱的一级。受此启发,我们研究了三角形格条几何上的半满扩展哈伯德模型。我们认为,通过使用大规模的数值模拟和分析玻色子化,这个模型窝藏一个连续的(Kosterlitz-类无隙)量子相变之间的金属和一个无隙自旋液体的特征在于自旋费米面,即,自旋金属。“这些结果可能提供了一个罕见的洞察莫特临界在强相互作用的二维材料的发展,并代表了莫特绝缘量子自旋液体相在一个真正的电子显微镜模型的第一个数值演示之一。

英文摘要:

More than half a century after first being proposed by Sir Nevill Mott, the deceptively simple question of whether the interaction-driven electronic metal-insulator transition may be continuous remains enigmatic. Recent experiments on two-dimensional materials suggest that when the insulator is a quantum spin liquid, lack of magnetic long-range order on the insulating side may cause the transition to be continuous, or only very weakly first order. Motivated by this, we study a half-filled extended Hubbard model on a triangular lattice strip geometry. We argue, through use of large-scale numerical simulations and analytical bosonization, that this model harbors a continuous (Kosterlitz-Thouless-like) quantum phase transition between a metal and a gapless spin liquid characterized by a spinon Fermi surface, i.e., a "spinon metal." These results may provide a rare insight into the development of Mott criticality in strongly interacting two-dimensional materials and represent one of the first numerical demonstrations of a Mott insulating quantum spin liquid phase in a genuinely electronic microscopic model.

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。

↑