| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Superconductivity of the FeSe/SrTiO$_{3}$ Interface in View of BCS–BEC Crossover |
| Shuyuan Zhang1,2, Guangyao Miao1,2, Jiaqi Guan1,2, Xiaofeng Xu1,2, Bing Liu1,2, Fang Yang1, Weihua Wang1, Xuetao Zhu1,2,3**, Jiandong Guo1,2,3,4** |
1Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190
2School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049
3Songshan Lake Materials Laboratory, Dongguan 523808
4Beijing Academy of Quantum Information Sciences, Beijing 100193
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| Cite this article: |
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Shuyuan Zhang, Guangyao Miao, Jiaqi Guan et al 2019 Chin. Phys. Lett. 36 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.
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Received: 05 July 2019
Published: 21 September 2019
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| PACS: |
74.20.-z
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(Theories and models of superconducting state)
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74.78.Fk
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(Multilayers, superlattices, heterostructures)
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