Cavity engineering of Hubbard U via phonon polaritons

Dé, B. Le; Eckhardt, Christian; Kennes, Dante M.; Sentef, Michael A.

doi:10.1088/2515-7639/ac618e

Cited by 7 publications

(2 citation statements)

References 155 publications

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“…In view of the resonant nature of our mechanism, an interesting future direction is to explore its applicability in the context of cavity material engineering [48][49][50][51][52] for which several proposals for cavity-induced superconductivity already exist. [53][54][55][56][57]…”

Section: Mechanism For Induced Electron-electron Attractionmentioning

confidence: 99%

Theory of resonantly enhanced photo-induced superconductivity

Eckhardt¹,

Chattopadhyay²,

Kennes³

et al. 2023

Preprint

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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 SrTiO3graphene heterostructure.

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Section: Mechanism For Induced Electron-electron Attractionmentioning

confidence: 99%

Theory of resonantly enhanced photo-induced superconductivity

Eckhardt¹,

Chattopadhyay²,

Kennes³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…58 In view of the resonant nature of our mechanism, an interesting future direction is to explore its applicability in the context of cavity materials engineering, [59][60][61][62][63] for which several proposals for cavity-induced superconductivity already exist. [64][65][66][67][68]…”

Section: And the Dispersion Relation Of The Lower Band |ξC|mentioning

confidence: 99%

Theory of resonantly enhanced photo-induced superconductivity

Michael,

Eckhardt,

Chattopadhyay

et al. 2023

Preprint

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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 propose a concrete setup consisting of a graphene hBN-SrTiO3 heterostructure, for which we estimate a superconducting Tc that may be achieved upon driving the system.

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Theory of resonantly enhanced photo-induced superconductivity

Eckhardt,

Chattopadhyay,

Kennes

et al. 2024

Nat Commun

View full text Add to dashboard Cite

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.

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Cavity engineering of Hubbard U via phonon polaritons

Cited by 7 publications

References 155 publications

Theory of resonantly enhanced photo-induced superconductivity

Theory of resonantly enhanced photo-induced superconductivity

Theory of resonantly enhanced photo-induced superconductivity

Theory of resonantly enhanced photo-induced superconductivity

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