Theory of resonantly enhanced photo-induced superconductivity

Christian J. Eckhardt, Sambuddha Chattopadhyay, Dante M. Kennes, Eugene A. Demler, Michael A. Sentef and Marios H. Michael ()
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Christian J. Eckhardt: Center for Free-Electron Laser Science (CFEL)
Sambuddha Chattopadhyay: Harvard University
Dante M. Kennes: Center for Free-Electron Laser Science (CFEL)
Eugene A. Demler: ETH Zürich
Michael A. Sentef: Center for Free-Electron Laser Science (CFEL)
Marios H. Michael: Center for Free-Electron Laser Science (CFEL)

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Optical driving of materials has emerged as a versatile tool to control their properties, with photo-induced superconductivity being among the most fascinating examples. In this work, we show that light or lattice vibrations coupled to an electronic interband transition naturally give rise to electron-electron attraction that may be enhanced when the underlying boson is driven into a non-thermal state. We find this phenomenon to be resonantly amplified when tuning the boson’s frequency close to the energy difference between the two electronic bands. This result offers a simple microscopic mechanism for photo-induced superconductivity and provides a recipe for designing new platforms in which light-induced superconductivity can be realized. We discuss two-dimensional heterostructures as a potential test ground for light-induced superconductivity concretely proposing a setup consisting of a graphene-hBN-SrTiO3 heterostructure, for which we estimate a superconducting Tc that may be achieved upon driving the system.

Date: 2024
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DOI: 10.1038/s41467-024-46632-x

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