Physical Review B, volume 107, issue 10, publication number 104517

Real-space BCS-BEC crossover in FeSe monolayers

Haicheng Lin ¹

Wantong Huang ¹

Gautam Rai ^{2, 3}

Yuguo Yin ¹

LIANYI HE ¹

QI-KUN XUE ^{1, 4, 5}

Stephan Haas ^{2, 6}

Stefan Kettemann ^{6, 7}

Xi Chen ^{1, 4, 5}

Shuai Hua Ji ^{1, 4, 5}

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State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China |

Department of Physics and Astronomy, University of Southern California, Los Angeles, California 90089-0484, USA |

I. Institute of Theoretical Physics, University of Hamburg, Notkestraße 9-11, 22607 Hamburg, Germany |

⁴

Frontier Science Center for Quantum Information, Beijing 100084, China |

⁵

Collaborative Innovation Center of Quantum Matter, Beijing 100084, China |

⁶

Constructor University Bremen (formerly Jacobs University Bremen), 28759 Bremen, Germany |

⁷

Division of Advanced Materials Science, POSTECH, San 31, Hyoja-dong, Nam-gu, Pohang 790-784, South Korea |

Publication type: Journal Article

Publication date: 2023-03-28

American Physical Society (APS)

Journal: Physical Review B

scimago Q1

wos Q2

SJR: 1.345

CiteScore: 6.3

Impact factor: 3.2

ISSN: 24699950, 24699969, 10980121, 1550235X

DOI: 10.1103/physrevb.107.104517

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Abstract

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.

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Publisher

American Physical Society (APS)

Journal

Physical Review B

scimago Q1

wos Q2

SJR

1.345

CiteScore

6.3

Impact factor

3.2

ISSN

24699950 (Print)

24699969 (Electronic)

10980121 (Print)

1550235X (Electronic)

Real-space BCS-BEC crossover in FeSe monolayers

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