Tunneling spectra of unconventional quasi-two-dimensional superconductors
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arXiv
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| Format: | Preprint |
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2024
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| author | Pisani, L. Moshe, A. G. Pieri, P. Strinati, G. Calvanese Deutscher, G. |
| author_facet | Pisani, L. Moshe, A. G. Pieri, P. Strinati, G. Calvanese Deutscher, G. |
| contents | Superfluid condensation can fundamentally be different from that predicted by the Bardeen-Cooper-Schrieffer (BCS) theory. In a broad class of low-carrier-density superconductors, such as granular aluminum, doped nitrides, and high-Tc cuprates, tunneling experiments reveal strong rather than weak coupling, as well as a conductance that does not return to that of the normal state upon approaching the critical temperature Tc. Here, we show that this behavior is in quantitative agreement with a tunneling theory that takes into account the large pairing-fluctuation effects that occur in the crossover region from weak-coupling BCS to strong-coupling Bose-Einstein condensation, provided the coherence energy scale rather than the single-particle energy gap is used to evaluate the coupling ratio. We also propose that the tendency toward strong coupling is a generic property of quasi-2D low-carrier-density superconductors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_16804 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Tunneling spectra of unconventional quasi-two-dimensional superconductors Pisani, L. Moshe, A. G. Pieri, P. Strinati, G. Calvanese Deutscher, G. Superconductivity Quantum Gases Superfluid condensation can fundamentally be different from that predicted by the Bardeen-Cooper-Schrieffer (BCS) theory. In a broad class of low-carrier-density superconductors, such as granular aluminum, doped nitrides, and high-Tc cuprates, tunneling experiments reveal strong rather than weak coupling, as well as a conductance that does not return to that of the normal state upon approaching the critical temperature Tc. Here, we show that this behavior is in quantitative agreement with a tunneling theory that takes into account the large pairing-fluctuation effects that occur in the crossover region from weak-coupling BCS to strong-coupling Bose-Einstein condensation, provided the coherence energy scale rather than the single-particle energy gap is used to evaluate the coupling ratio. We also propose that the tendency toward strong coupling is a generic property of quasi-2D low-carrier-density superconductors. |
| title | Tunneling spectra of unconventional quasi-two-dimensional superconductors |
| topic | Superconductivity Quantum Gases |
| url | https://arxiv.org/abs/2409.16804 |