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Published on: August 2, 2019
Tailoring Superconductivity with Two-Level Systems
Joshuah T Heath1,2, Alexander C Tyner1,2, S Pamir Alpay3,4
1KTH Royal Institute of Technology, Stockholm University, Nordita, Hannes Alfvéns väg 12, SE-106 91 Stockholm, Sweden.
Abstract:
We investigate the impact of two-level systems (TLSs) on superconductivity, treating them as soft modes localized in real space. We show that these defects can either enhance or suppress the superconducting critical temperature, depending on their surface density and average frequency. Using thin-film aluminium as a case study, we quantitatively describe how TLSs modify both the critical temperature and the zero-temperature superconducting gap. Our results thus highlight new opportunities for tailoring material properties through TLS engineering.
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