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Charge d-Wave Topological Insulator

机译:电荷d波拓扑绝缘体

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摘要

Formation of a condensate of singlet electron–hole pairs in a two-dimensional metal lattice with the nesting of the Fermi contour is investigated. A numerical solution is obtained for the self-consistency equation for the insulating order parameter depending on the ratio of the coupling constants in the sand dwave channels of electron–hole pairing. Solutions with the pure orbital symmetry of sand d-type are found, as well as solutions with the mixed s + d-symmetry. It is shown that in a wide range of values of the sand dwave coupling constants, the two-dimensional insulating order with the orbital symmetry d_(x~2-y~2) can compete with pure ordered sand d_(xy)-states and mixed s + d-states. Time reversal symmetry breaking under an established real order with d_(x~2-y~2) -wave symmetry may generate the imaginary component of the order parameter with symmetry d_(xy) and cause a rise in topologically nontrivial d + id-wave ordering similar to the quantum Hall state in the absence of external magnetic field.
机译:研究了在费米轮廓嵌套的二维金属晶格中单重态电子-空穴对的冷凝物的形成。根据电子-空穴对的沙波通道中耦合常数的比值,获得了绝缘阶数参数的自洽方程的数值解。找到了具有d型纯轨道对称性的解,以及具有s + d混合对称性的解。结果表明,在大范围的沙波耦合常数值中,具有轨道对称d_(x〜2-y〜2)的二维绝缘阶可以与纯有序沙d_(xy)-态和混合的s + d状态。在已建立的具有d_(x〜2-y〜2)实阶的时间反转对称中-波对称性可能会生成具有d_(xy)对称性的阶跃参数的虚分量,并导致拓扑非平凡d + id波的上升在没有外部磁场的情况下,其排序类似于量子霍尔态。

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