Publisher：Physical Review B  

Recent experiments on 2D superconductors allow the characterization of the critical temperature and of the phase diagram across the BCS-BEC crossover as a function of density. We obtain from these experiments the microscopic parameters of the superconducting state at low temperatures by the BCS mean-field approach. For LixZrNCl, the extracted parameters are used to evaluate the superconducting phase stiffness and the Berezinskii-Kosterlitz-Thouless (BKT) critical temperature throughout the BCS-BEC crossover by implementing the corresponding renormalization group (RG) approach. In this way, we make a quantitative test of the predictive power of the BKT theory for evaluating the critical temperature. The RG flow equations turn out to give a sizable renormalization of the phase stiffness and of the critical temperature, which is crucial to obtain a satisfactory agreement between the BKT theory and the experiments, in particular, in the BCS-BEC crossover regime. We predict the temperature range where phase stiffness renormalization can be measured in LixZrNCl across the BCS-BEC crossover. Contrary to other microscopic theories of superconductivity, we find that the BKT theory can be exploited to evaluate quantitatively the critical temperature of 2D superconductors in different pairing regimes.

DOI： 10.1103/PhysRevB.110.214502

Web of Science

Scopus

Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1103/PhysRevB.110.L140503

DOI： 10.1103/PhysRevB.110.L140503

Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1103/PhysRevB.110.134501

DOI： 10.1103/PhysRevB.110.134501

Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1007/s43673-023-00087-2

DOI： 10.1007/s43673-023-00087-2

Open Access

Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1103/PhysRevA.107.L041302

DOI： 10.1103/PhysRevA.107.L041302

Event date： 2025.10

Presentation type：Poster presentation  

Event date： 2025.9

Language：Japanese   Presentation type：Oral presentation (general)  

Event date： 2025.9

Presentation type：Oral presentation (general)  

Event date： 2025.9

Presentation type：Poster presentation  

Event date： 2025.9

Language：Japanese   Presentation type：Poster presentation