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  Theory of resonantly enhanced photo-induced superconductivity

Eckhardt, C., Chattopadhyay, S., Kennes, D. M., Demler, E. A., Sentef, M. A., & Michael, M. (2023). Theory of resonantly enhanced photo-induced superconductivity.

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2303.02176.pdf (Preprint), 5MB
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File downloaded from arXiv at 2023-03-07
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https://arxiv.org/abs/2303.02176 (Preprint)
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 Creators:
Eckhardt, C.1, 2, 3, Author           
Chattopadhyay, S.4, Author
Kennes, D. M.1, 3, 5, Author           
Demler, E. A.6, Author
Sentef, M. A.2, 3, 7, Author           
Michael, M.3, 5, Author           
Affiliations:
1Institut für Theorie der Statistischen Physik, RWTH Aachen University and JARA-Fundamentals of Future Information Technology, ou_persistent22              
2Theoretical Description of Pump-Probe Spectroscopies in Solids, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_3012828              
3Center for Free-Electron Laser Science (CFEL), ou_persistent22              
4Lyman Laboratory, Department of Physics, Harvard University, ou_persistent22              
5Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
6Institute for Theoretical Physics, ETH Zürich, ou_persistent22              
7H H Wills Physics Laboratory, University of Bristol, ou_persistent22              

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Free keywords: Condensed Matter, Superconductivity, cond-mat.supr-con, Condensed Matter, Mesoscale and Nanoscale Physics, cond-mat.mes-hall, Condensed Matter, Strongly Correlated Electrons, cond-mat.str-el
 Abstract: Optical driving of materials has emerged as a promising tool to control their macroscopic properties. In this work we present a microscopic mechanism for efficiently photo-inducing superconductivity. We investigate an attractive electron-electron interaction mediated by a boson that couples to an electronic transition between two bands separated by a band gap. While this attraction is small in equilibrium, we find that it can be increased by several orders of magnitude when the bosons are driven into a nonthermal state. Moreover, not only is the induced attraction enhanced when the bosons are driven, but this enhancement is further amplified when the boson is near-resonant to the electronic interband excitation energy, making this mechanism a potentially ideal candidate for efficient photo-induced superconductivity. We first use exact diagonalisation calculations of a two-site model to prove that pairing is indeed resonantly enhanced out-of equilibrium. We then investigate the potential of this mechanism to increase the superconducting transition temperature, and find by investigating the gap equation that pairing is resonantly amplified when the bosons are in a nonthermal state. We argue that our proposed mechanism provides a simple prescription for designing new platforms that enable photo-induced superconductivity at significant temperatures and moderate driving strengths, and estimate a transition temperature Tc≈5K for a SrTiO3 -- graphene heterostructure.

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Language(s): eng - English
 Dates: 2023-03-03
 Publication Status: Published online
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Type: No review
 Identifiers: arXiv: 2303.02176
 Degree: -

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