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arXiv 1105.4900cond-mat.str-elquant-ph
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相互作用对量子自旋霍尔绝缘体的影响

The effects of interaction on quantum spin Hall insulators

Dung-Hai Lee

摘要:

本文从场论的角度研究了Hubbard $U$存在下的$S_z$守恒量子自旋霍尔绝缘体.主要调查结果如下。(1)对于任意小的U的边缘具有幂律相关的反铁磁XY局部矩。无隙电荷激发来自Goldstone-Wilczek机制。(2)XY关联的衰减指数是$\ge 2$,因此正常情况下时空涡旋应该增殖。(3)对于热力学样品,边缘电荷守恒禁止涡旋扩散。(4)对于具有有限宽度的样品,相对边缘之间的电子隧穿允许涡旋扩散,因此是强烈相关的扰动(比非相互作用理论中更相关)。(5)反铁磁相和拓扑绝缘相之间的相变由磁激子的凝聚触发。

英文摘要:

We study the $S_z$-conserving quantum spin Hall insulator in the presence of Hubbard $U$ from a field theory point view. The main findings are the following. (1) For arbitrarily small U the edges possess power-law correlated antiferromagnetic XY local moments. Gapless charge excitations arise from the Goldstone-Wilczek mechanism. (2) The decaying exponent of the XY correlation is $\ge 2$ hence normally space-time vortices should proliferate. (3) For thermodynamic samples, vortex proliferation is prohibited by the conservation of edge charge. (4) For a sample with finite width electron tunneling between opposite edges allows vortex proliferation hence is a strongly relevant perturbation (more relevant than in the non-interacting theory). (5) The phase transition between the antiferromagnetic and the topological insulating phases is triggered by the condensation of magnetic excitons.

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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