Chen Chao, Zhong Peigeng, Sui Xuelei, Ma Runyu, Liang Ying, Hu Shijie, Ma Tianxing, Lin Hai-Qing, Huang Bing
School of Physics and Astronomy, Beijing Normal University, Beijing, 100875, China.
Beijing Computational Science Research Center, Beijing, 100084, China.
Nat Commun. 2024 Nov 3;15(1):9502. doi: 10.1038/s41467-024-53841-x.
Charge stripes have been widely observed in many different types of unconventional superconductors, holding varying periods ( ) and intensities. However, a general understanding on the interplay between charge stripes and superconducting properties is still incomplete. Here, using large-scale unbiased numerical simulations on a general inhomogeneous Hubbard model, we discover that the charge-stripe period , which is variable in different real material systems, could dictate the pairing symmetries-d wave for and d waves for . In the latter, tuning hole doping and charge-stripe amplitude can trigger a d-s wave transition and magnetic-correlation shift, where the d-wave state converts to a pairing-density wave state, competing with the s wave. These interesting phenomena arise from an unusual stripe-induced selection rule of pairing symmetries around on-stripe region and within inter-stripe region, giving rise to a critical point of for the phase transition. In general, our findings offer important insights into the differences in the superconducting pairing mechanisms across many -dependent superconducting systems, highlighting the decisive role of charge stripe.
电荷条纹已在许多不同类型的非常规超导体中被广泛观测到，其具有不同的周期（ ）和强度。然而，对于电荷条纹与超导特性之间相互作用的全面理解仍不完整。在此，通过对一般非均匀哈伯德模型进行大规模无偏数值模拟，我们发现，在不同实际材料系统中可变的电荷条纹周期 ，可以决定配对对称性—— 时为d波， 时为d波。在后者中，调节空穴掺杂和电荷条纹幅度可引发d-s波转变和磁关联偏移，其中d波态转变为配对密度波态，并与s波竞争。这些有趣的现象源于条纹诱导的在条纹区域内和条纹间区域周围配对对称性的异常选择规则，从而产生了相变的临界点 。总体而言，我们的发现为许多依赖于 的超导系统中超导配对机制的差异提供了重要见解，突出了电荷条纹的决定性作用。
