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arXiv 2406.07960cond-mat.str-el
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空穴掺杂三角Mott绝缘体4Hb-TaS2中的电荷有序相

Charge ordered phases in the hole-doped triangular Mott insulator 4Hb-TaS2

Junho Bang, Byeongin Lee, Hyungryul Yang, Sunghun Kim, Dirk Wulferding, Doohee Cho

AI总结:

本研究利用STM/S考察4Hb-TaS2中非半填充1T-TaS2层的电荷有序相,发现能隙与电荷密度反相,并归因于在位与非局域库仑排斥竞争。

摘要:

4Hb-TaS2因其独特的层状结构而被认为具有破坏时间反演对称性的非常规超导性,其结构特征是二维三角Mott绝缘体与电荷密度波金属之间形成异质结。然而,由于关联绝缘层中的阻挫自旋态在载流子掺杂时容易出现电荷有序,因此需要研究层间电荷转移所驱动的电荷分布,以理解其超导性。在这里,我们采用扫描隧道显微术与谱学(STM/S)研究4Hb-TaS2内1T-TaS2层的电荷有序相,并明确聚焦于非半填充区域。我们的STS结果显示出一个能隙,该能隙与电荷密度呈现反相关系。我们将在位库仑排斥与非局域库仑排斥之间的竞争归因于掺杂三角Mott绝缘体的电荷有序绝缘相的驱动力。此外,我们还讨论了绝缘层在4Hb-TaS2增强超导性中的作用。

英文摘要:

4Hb-TaS2 has been proposed to possess unconventional superconductivity with broken time reveral symmetry due to distinctive layered structure, featuring a heterojunction between a 2D triangular Mott insulator and a charge density wave metal. However, since a frustrated spin state in the correlated insulating layer is susceptible to charge ordering with carrier doping, it is required to investigate the charge distribution driven by inter-layer charge transfer to understand its superconductivity. Here, we use scanning tunneling microscopy and spectroscopy (STM/S) to investigate the charge ordered phases of 1T-TaS2 layers within 4Hb-TaS2, explicitly focusing on the non-half-filled regime. Our STS results show an energy gap which exhibits an out-of-phase relation with the charge density. We ascribe the competition between on-site and nonlocal Coulomb repulsion as the driving force for the charge-ordered insulating phase of a doped triangular Mott insulator. In addition, we discuss the role of the insulating layer in the enhanced superconductivity of 4Hb-TaS2.

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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