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arXiv 2108.13626cond-mat.str-elcond-mat.mes-hallcond-mat.supr-con
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手征多体相互作用诱导的Floquet拓扑$d+id$超导

Floquet topological $d+id$ superconductivity induced by chiral many-body interactions

Sota Kitamura, Hideo Aoki

摘要:

在排斥哈伯德模型下,研究了强耦合区中$d$波超导体在圆偏振光照射下的变化。我们采用Floquet形式的Gutzwiller投影的有效哈密顿量与时间周期的Schriffl-Wolff变换。我们发现CPL诱导了具有$d+id$配对的拓扑超导电性,这种配对是由手征自旋耦合和CPL产生的三位项引起的,即使在CPL的低频和低强度下,三位项仍然很重要,这在所获得的相图中得到了清楚的反映,该相图针对不同频率的激光强度和温度,从Hubbard $U$红失谐,还检查了瞬态动力学。揭示的现象可以打开一个新的,动态的方式来诱导拓扑超导性。

英文摘要:

We study how a $d$-wave superconductivity is changed when illuminated by circularly-polarised light (CPL) in the repulsive Hubbard model in the strong-coupling regime. We adopt the Floquet formalism for the Gutzwiller-projected effective Hamiltonian with the time-periodic Schrieffer-Wolff transformation. We find that CPL induces a topological superconductivity with a $d+id$ pairing, which arises from the chiral spin coupling and the three-site term generated by the CPL. The latter term remains significant even for low frequencies and low intensities of the CPL. This is clearly reflected in the obtained phase diagram against the laser intensity and temperature for various frequencies red-detuned from the Hubbard $U$, with the transient dynamics also examined. The phenomenon revealed here can open a novel, dynamical way to induce a topological superconductivity.

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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