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In paired Fermi systems, strong many-body effects exhibit in the crossoverregime between the Bardeen-Cooper-Schrieffer (BCS) and the Bose-Einsteincondensation (BEC) limits. The concept of the BCS-BEC crossover, which isstudied intensively in the research field of cold atoms, has been extended tocondensed matters. Here, by analyzing the typical superconductors within theBCS-BEC phase diagram, we find that FeSe-based superconductors are prone toshift their positions in the BCS-BEC crossover regime by charge doping orsubstrate substitution, since their Fermi energies and the superconducting gapsizes are comparable. Especially at the interface of a single-layer FeSe onSrTiO3 substrate, the superconductivity is relocated closer to the crossoverunitary than other doped FeSe-based materials, indicating that the pairinginteraction is effectively modulated. We further show that hole-doping candrive the interfacial system into the phase with possible pre-paired electrons,demonstrating its flexible tunability within the BCS-BEC crossover regime.

Superconductivity of the FeSe/SrTiO3 Interface in the View of BCS-BEC Crossover