Atomic-Site-Dependent Pairing Gap in Monolayer FeSe/SrTiO₃(001)-(â 13 x â 13)

Ding, Cui1,2; Wei, Zhongxu3; Dong, Wenfeng1; Feng, Hai1; Shi, Mingxia1; Wang, Lili1,4; Jia, Jin-Feng2,3,5; Xue, Qi-Kun1,2,3,4

2024-06-01

10.1021/acs.nanolett.4c02627

NANO LETTERS   影响因子和分区

1530-6984

1530-6992

The interfacial FeSe/TiO2-delta coupling induces high-temperature superconductivity in monolayer FeSe films. Using cryogenic atomically resolved scanning tunneling microscopy/spectroscopy, we obtained atomic-site dependent surface density of states, work function, and the pairing gap in the monolayer FeSe on the SrTiO3(001)-(root 13 x root 13)-R33.7 degrees surface. Our results disclosed the out-of-plane Se-Fe-Se triple layer gradient variation, switched DOS for Fe sites on and off TiO5 square, and inequivalent Fe sublattices, which gives global spatial modulation of pairing gap contaminants with the (root 13 x root 13) pattern. Moreover, the coherent lattice coupling induces strong inversion asymmetry and in-plane anisotropy in the monolayer FeSe, which is demonstrated to correlate with the particle-hole asymmetry in coherence peaks. These results disclose delicate atomic-scale correlations between pairing and lattice-electronic coupling in the Bardeen-Cooper-Schrieffer to Bose-Einstein condensation crossover regime, providing insights into understanding the pairing mechanism of multiorbital superconductivity.

FeSe/SrTiO3(001)-(root 13 x root 13) broken rotational symmetry interface dipole particle-hole asymmetry Fe sublattice scanning tunneling microscopy/spectroscopy

SCI ; EI

英语

通讯

National Natural Science Foundation of China["52388201","12074210","12204222"] ; National Basic Research Program of China[2022YFA1403102] ; Basic and Applied Basic Research Major Programme of Guangdong Province, China[2021B0301030003] ; Jihua Laboratory[X210141TL210]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:001254367800001

AMER CHEMICAL SOC

MATERIALS SCIENCE

Web of Science

1.Tsinghua Univ, Dept Phys, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China
2.Quantum Sci Ctr Guangdong Hong Kong Macao Greater, Hong Kong 518045, Peoples R China
3.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China
4.Frontier Sci Ctr Quantum Informat, Beijing 100084, Peoples R China
5.Shanghai Jiao Tong Univ, Dept Phys & Astron, Shanghai 200240, Peoples R China

Ding, Cui,Wei, Zhongxu,Dong, Wenfeng,et al. Atomic-Site-Dependent Pairing Gap in Monolayer FeSe/SrTiO₃(001)-(â 13 x â 13)[J]. NANO LETTERS,2024.

Ding, Cui.,Wei, Zhongxu.,Dong, Wenfeng.,Feng, Hai.,Shi, Mingxia.,...&Xue, Qi-Kun.(2024).Atomic-Site-Dependent Pairing Gap in Monolayer FeSe/SrTiO₃(001)-(â 13 x â 13).NANO LETTERS.

Ding, Cui,et al."Atomic-Site-Dependent Pairing Gap in Monolayer FeSe/SrTiO₃(001)-(â 13 x â 13)".NANO LETTERS (2024).