Real-space BCS-BEC crossover in FeSe monolayers

被引：9

作者：

Lin, Haicheng ^{[1
]}

Huang, Wantong ^{[1
]}

Rai, Gautam ^{[2
,3
]}

Yin, Yuguo ^{[1
]}

He, Lianyi ^{[1
]}

Xue, Qi-Kun ^{[1
,4
,5
]}

Haas, Stephan ^{[2
,6
,7
]}

Kettemann, Stefan ^{[6
,7
,8
]}

Chen, Xi ^{[1
,4
,5
]}

Ji, Shuai-Hua ^{[1
,4
,5
]}

机构：

[1] Tsinghua Univ, Dept Phys, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China

[2] Univ Southern Calif, Dept Phys & Astron, Los Angeles, CA 90089 USA

[3] Univ Hamburg, Inst Theoret Phys 1, Notkestr 9-11, D-22607 Hamburg, Germany

[4] Frontier Sci Ctr Quantum Informat, Beijing 100084, Peoples R China

[5] Collaborat Innovat Ctr Quantum Matter, Beijing 100084, Peoples R China

[6] Constructor Univ Bremen, D-28759 Bremen, Germany

[7] Jacobs Univ Bremen, D-28759 Bremen, Germany

[8] POSTECH, Div Adv Mat Sci, San 31, Pohang 790784, South Korea

来源：

PHYSICAL REVIEW B | 2023年 / 107卷 / 10期

基金：

中国国家自然科学基金;

关键词：

BOSE-EINSTEIN CONDENSATION; SUPERCONDUCTIVITY; FLUCTUATIONS; PHASE;

D O I：

10.1103/PhysRevB.107.104517

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The quantum many-body states in the Bardeen-Cooper-Schrieffer-Bose-Einstein condensation (BCS-BEC) crossover regime are of long-lasting interest. Here we report direct spectroscopic evidence of BCS-BEC crossover in real space in a FeSe monolayer thin film by using spatially resolved scanning tunneling spectra. The crossover is driven by the shift of band structure relative to the Fermi level. The theoretical calculation based on a two-band model qualitatively reproduces the measured spectra in the whole crossover range. In addition, the Zeeman splitting of the quasiparticle states is found to be consistent with the characteristics of a condensate. Our work paves the way to study the exotic states of BCS-BEC crossover in a two-dimensional crystalline material at the atomic scale.

引用

页数：8

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