Realization of a hole-doped Mott insulator on a triangular silicon lattice and its zero-bias-anomaly
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| 报告题目 | Realization of a hole-doped Mott insulator on a triangular silicon lattice and its zero-bias-anomaly |
| 报告人 | 明方飞 博士 |
| 报告人单位 | 美国田纳西大学-诺克斯维尔分校 |
| 报告时间 | 2018-01-19 10:00 |
| 报告地点 | 合肥微尺度物质科学国家研究中心（9004） |
| 主办单位 | 合肥微尺度物质科学国家研究中心、国际功能材料量子设计中心（ICQD） |
| 报告介绍 | 报告摘要：
The physics of doped Mott insulators is at the heart of some of the most exotic physical phenomena in materials research including insulator-metal transitions, colossal magneto-resistance, and high-temperature superconductivity in layered perovskite compounds. Advances in this field would greatly benefit from the availability of new material systems with similar richness of physical phenomena, but with fewer chemical and structural complications in comparison to oxides. Using scanning tunneling microscopy and spectroscopy (STM/STS), we show that such a system can be realized on a silicon platform. Adsorption of one-third monolayer of Sn atoms on a Si(111) surface produces a triangular surface lattice with half-filled dangling bond orbitals. Modulation hole-doping of these dangling bonds unveils clear hallmarks of Mott physics, such as spectral weight transfer and the formation of quasi-particle states at the Fermi level, well-defined Fermi contour segments, and a sharp singularity in the density of states. We further show that the maximum hole-density of this system increases with decreasing domain size as the area of the Mott insulating domains approaches the nanoscale regime. Concomitantly, STS data at 4.4 K reveal an increasingly prominent zero bias anomaly (ZBA). We consider two different scenarios as potential mechanisms for this ZBA: chiral d_(x^2 〖-y〗^2 )+ id_xy wave superconductivity and a dynamical Coulomb blockade (DCB) effect. With a thorough experimental characterization, we conclude that the ZBA is predominantly due to a DCB effect, while a superconducting instability is absent or a minor contributing factor.
Reference:
[1] F. Ming, et. al., PRL 119, 266802 (2017)
[2] F. Ming, et. al., arXiv:1712.02736 (to be published in PRB)
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