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arXiv 2603.28490cond-mat.supr-con
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在扭折层状材料中出现Bogoliubov平面波

Bogoliubov flat bands in twisted layered materials

Nagoya University(名古屋大学);Okayama University(冈山大学)

Keiji Yada, Yuri Fukaya, Yukio Tanaka

AI总结:

研究扭折d波超导体中Bogoliubov平面波的形成机制,揭示扭角作为设计无能隙平面波超导体的调控参数。

摘要:

平面波在凝聚态物理中受到广泛关注,因其为实现强关联和拓扑量子相提供肥沃平台。然而,迄今为止大多数研究集中在正常态电子结构中的平面波,如石墨烯和过渡金属二硫化物。在本工作中,我们研究了扭折层状d波超导体中超导Bogoliubov准粒子谱中平面波的出现。我们证明当超导序参量在平面C₂旋转下为奇函数时,Bogoliubov平面波可以在旋转轴附近被工程化。通过分析低能有效哈密顿量,我们展示单层系统 Berry 连接提供了明确的Bogoliubov平面波形成的判据。我们的结果建立了一种新的超导扭折范式,其中扭角作为设计无能隙平面波超导体的强大调制参数。

英文摘要:

Flat bands have attracted considerable interest in condensed matter physics because they provide a fertile platform for realizing strongly correlated and topological quantum phases. To date, however, most studies have focused on flat bands in normal-state electronic structures, such as those found in graphene and transition metal dichalcogenides. In this work, we investigate the emergence of flat bands in the superconducting Bogoliubov quasiparticle spectrum of twisted layered $d$-wave superconductors. We show that when the superconducting order parameter is odd under the in-plane $\mathrm{C}_2$ rotation, Bogoliubov flat bands can be engineered in the vicinity of the rotation axis. By analyzing a low-energy effective Hamiltonian, we demonstrate that the Berry connection of single layer system provides a clear criterion for the formation of the Bogoliubov flat bands. Our results establish a new paradigm of superconducting twistronics, in which the twist angle acts as a powerful tuning parameter for designing gapless flat-band superconductors.

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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