Superconductivity of the FeSe/SrTiO$_{3}$ Interface in View of BCS–BEC Crossover

doi:10.1088/0256-307X/36/10/107404

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Abstract：In paired Fermi systems, strong many-body effects exhibit in the crossover regime between the Bardeen–Cooper–Schrieffer (BCS) and the Bose–Einstein condensation (BEC) limits. The concept of the BCS–BEC crossover, which is studied intensively in the research field of cold atoms, has been extended to condensed matters. Here by analyzing the typical superconductors within the BCS–BEC phase diagram, we find that FeSe-based superconductors are prone to shift their positions in the BCS–BEC crossover regime by charge doping or substrate substitution, since their Fermi energies and the superconducting gap sizes are comparable. Especially at the interface of single-layer FeSe on SrTiO$_{3}$ substrate, the superconductivity is relocated closer to the crossover unitary than other doped FeSe-based materials, indicating that the pairing interaction is effectively modulated. We further show that hole-doping can drive the interfacial system into the phase with possible pre-paired electrons, demonstrating its flexible tunability within the BCS–BEC crossover regime.

收稿日期: 2019-07-05 出版日期: 2019-09-21

:	74.20.-z	(Theories and models of superconducting state)
	74.78.Fk	(Multilayers, superlattices, heterostructures)

引用本文:

. [J]. 中国物理快报, 2019, 36(10): 107404-.
Shuyuan Zhang, Guangyao Miao, Jiaqi Guan, Xiaofeng Xu, Bing Liu, Fang Yang, Weihua Wang, Xuetao Zhu, Jiandong Guo. Superconductivity of the FeSe/SrTiO$_{3}$ Interface in View of BCS–BEC Crossover. Chin. Phys. Lett., 2019, 36(10): 107404-.

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https://cpl.iphy.ac.cn/CN/10.1088/0256-307X/36/10/107404 或 https://cpl.iphy.ac.cn/CN/Y2019/V36/I10/107404

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