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Fractionalized quantum spin Hall effect

机译:分数量子自旋霍尔效应

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摘要

Effects of electron correlations on a twb-dimensional quantum spin Hall (QSH) system are studied. We examine possible phases of a generalizec Hubbard model on a bilayer honeycomb lattice with a spin-orbit coupling and short-range electron-electron repulsions at half filling, based on the slave-rotor mean-field theory. Besides the conventional QSH phase and a broken-symmetry insulating phase, we find a third phase, a fractionalized quantum spin Hall phase, where the QSH effect arises for fractionalized spinons which carry only spin but not charge. Experimental manifestations of the exotic phase and effects of fluctuations beyond the saddle-point approximation are also discussed.
机译:研究了电子相关性对twb维量子自旋霍尔(QSH)系统的影响。我们根据从转子平均场理论,研究了具有自旋轨道耦合和半填充时的短程电子-电子排斥的双层蜂窝晶格上的Generalizec Hubbard模型的可能相位。除了常规的QSH相和对称对称的绝缘破坏相,我们还发现了第三相,即量子化的量子自旋霍尔相,其中仅携带自旋但不带电荷的部分化的自旋子产生了QSH效应。还讨论了奇异相位的实验表现形式以及超出鞍点近似的波动影响。

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