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arXiv 1107.1245cond-mat.str-el
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Kane-Mele-哈伯德模型的Phase Diagram

Phase Diagram of the Kane-Mele-Hubbard model

Christian Griset, Cenke Xu

摘要:

受最近数值结果的启发,我们研究了Kane-Mele-Hubbard(KHM)模型的相图,特别是它的量子临界点的性质。Kane-Mele-哈伯德模型的相图可以通过打破我们以前工作的SO(4)对称性而理解为U(1)_spin x U(1)_charge x PH对称性。面内Neel相的涡旋携带电荷,带电磁涡旋的扩散驱动面内Neel相和QSH绝缘体相之间的转变,这种转变属于3dXY普适类。液相和面内Neel相之间的转变是各向异性的O(4)转变,由于量子涨落,该转变最终变为一级。根据1/N计算,预测液态-QSH相变为一级相变。

英文摘要:

Motivated by recent numerical results, we study the phase diagram of the Kane-Mele-Hubbard (KHM) model, especially the nature of its quantum critical points. The phase diagram of the Kane-Mele-Hubbard model can be understood by breaking the SO(4) symmetry of our previous work down to U(1)_spin x U(1)_charge x PH symmetry. The vortices of the inplane Neel phase carry charge, and the proliferation of the charged magnetic vortex drives the transition between the inplane Neel phase and the QSH insulator phase; this transition belongs to the 3d XY universality class. The transition between the liquid phase and the inplane Neel phase is an anisotropic O(4) transition, which eventually becomes first order due to quantum fluctuation. The liquid-QSH transition is predicted to be first order based on a 1/N calculation.

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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