Universal approach to light driven “superconductivity” via preformed pairs
Abstract While there are many different mechanisms which have been proposed to understand the physics behind light induced “superconductivity”, what seems to be common to the class of materials in which this is observed are strong pairing correlations, which are present in the normal state. Here we...
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Nature Portfolio
2025-07-01
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| Series: | npj Quantum Materials |
| Online Access: | https://doi.org/10.1038/s41535-025-00787-y |
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| author | Ke Wang Zhiqiang Wang Qijin Chen K. Levin |
| author_facet | Ke Wang Zhiqiang Wang Qijin Chen K. Levin |
| author_sort | Ke Wang |
| collection | DOAJ |
| description | Abstract While there are many different mechanisms which have been proposed to understand the physics behind light induced “superconductivity”, what seems to be common to the class of materials in which this is observed are strong pairing correlations, which are present in the normal state. Here we argue, that the original ideas of Eliashberg are applicable to such a pseudogap phase and that with exposure to radiation the fermions are redistributed to higher energies where they are less deleterious to pairing. What results then is a photo-induced state with dramatically enhanced number of nearly condensed fermion pairs. In this phase, because the a.c. conductivity, σ(ω) = σ 1(ω) + i σ 2(ω), is dominated by the bosonic contribution, it can be computed using conventional (Aslamazov Larkin) fluctuation theory. We, thereby, observe the expected fingerprint of this photoinduced “superconducting” state which is a 1/ω dependence in σ 2 with fits to the data of the same quality as found for the so-called photo-enhanced (Drude) conductivity scenario. Here, however, we have a microscopic understanding of the characteristic low energy scale which appears in transport and which is necessarily temperature dependent. This approach also provides insight into recent observations of concomitant diamagnetic fluctuations. Our calculations suggest that the observed light-induced phase in these strongly paired superconductors has only short range phase coherence without long range superconducting order. |
| format | Article |
| id | doaj-art-ab000c1c6ccc44028c8cd07bfa99b6e6 |
| institution | Kabale University |
| issn | 2397-4648 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj Quantum Materials |
| spelling | doaj-art-ab000c1c6ccc44028c8cd07bfa99b6e62025-08-20T03:45:22ZengNature Portfolionpj Quantum Materials2397-46482025-07-011011810.1038/s41535-025-00787-yUniversal approach to light driven “superconductivity” via preformed pairsKe Wang0Zhiqiang Wang1Qijin Chen2K. Levin3Department of Physics ad James Franck Institute, University of ChicagoDepartment of Physics ad James Franck Institute, University of ChicagoHefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences, University of Science and Technology of ChinaDepartment of Physics ad James Franck Institute, University of ChicagoAbstract While there are many different mechanisms which have been proposed to understand the physics behind light induced “superconductivity”, what seems to be common to the class of materials in which this is observed are strong pairing correlations, which are present in the normal state. Here we argue, that the original ideas of Eliashberg are applicable to such a pseudogap phase and that with exposure to radiation the fermions are redistributed to higher energies where they are less deleterious to pairing. What results then is a photo-induced state with dramatically enhanced number of nearly condensed fermion pairs. In this phase, because the a.c. conductivity, σ(ω) = σ 1(ω) + i σ 2(ω), is dominated by the bosonic contribution, it can be computed using conventional (Aslamazov Larkin) fluctuation theory. We, thereby, observe the expected fingerprint of this photoinduced “superconducting” state which is a 1/ω dependence in σ 2 with fits to the data of the same quality as found for the so-called photo-enhanced (Drude) conductivity scenario. Here, however, we have a microscopic understanding of the characteristic low energy scale which appears in transport and which is necessarily temperature dependent. This approach also provides insight into recent observations of concomitant diamagnetic fluctuations. Our calculations suggest that the observed light-induced phase in these strongly paired superconductors has only short range phase coherence without long range superconducting order.https://doi.org/10.1038/s41535-025-00787-y |
| spellingShingle | Ke Wang Zhiqiang Wang Qijin Chen K. Levin Universal approach to light driven “superconductivity” via preformed pairs npj Quantum Materials |
| title | Universal approach to light driven “superconductivity” via preformed pairs |
| title_full | Universal approach to light driven “superconductivity” via preformed pairs |
| title_fullStr | Universal approach to light driven “superconductivity” via preformed pairs |
| title_full_unstemmed | Universal approach to light driven “superconductivity” via preformed pairs |
| title_short | Universal approach to light driven “superconductivity” via preformed pairs |
| title_sort | universal approach to light driven superconductivity via preformed pairs |
| url | https://doi.org/10.1038/s41535-025-00787-y |
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