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arXiv 1302.0157cond-mat.str-el
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金属-绝缘体相变附近的自旋液体态

Spin Liquid States at the vicinity of metal-insulator transition

Yi Zhou, Tai-Kai Ng

摘要:

本文研究了金属-绝缘体相变附近的量子自旋液体态。假设QSL中的低能激发用“自旋”占据数标记,并且费米表面结构与相应的金属(费米液体)侧相同,我们提出了QSL的唯象Landau类低能理论,并表明通常的U(1)QSL是这类自旋液体的代表成员。基于我们的有效低能理论,提出了一种替代Brinkman-Rice的Mott金属-绝缘体相变图象。在这种唯象下讨论了量子超晶格的电荷、自旋和热响应。

英文摘要:

We study in this paper quantum spin liquid states (QSLs) at the vicinity of metal-insulator transition. Assuming that the low energy excitations in the QSLs are labeled by "spinon" occupation numbers with the same Fermi surface structure as in the corresponding metal (Fermi-liquid) side, we propose a phenomenological Landau-like low energy theory for the QSLs and show that the usual U(1) QSLs is a representative member of this class of spin liquids. Based on our effective low energy theory, an alternative picture to the Brinkman-Rice picture of Mott metal-insulator transition is proposed. The charge, spin and thermal responses of QSLs are discussed under such a phenomenology.

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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