Dynamical renormalization of electron-phonon coupling in conventional superconductors

Girotto, Nina; Novko, Dino

doi:10.1103/physrevb.107.064310

Cited by 6 publications

(4 citation statements)

References 122 publications

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“…, with π q ν (ω)] is different from the static one, it is usually dubbed dynamical. The dynamical Kohn anomaly of optical phonons at q = Γ was reported for various single-layer and bulk materials (such as graphene, hole-doped diamond, MgB 2 , and doped TMDs) in thermal equilibrium. ,,− Here, we illustrate to which extent a photoexcited carrier distribution can provide a route to trigger and control the emergence of Kohn anomalies over transient timescales. The A 1g mode was shown to be significantly coupled to electrons once multiple valleys are occupied, as it is the case here for photoexcited MoS 2 .…”

Section: Resultsmentioning

confidence: 63%

Ultrafast Nonadiabatic Phonon Renormalization in Photoexcited Single-Layer MoS₂

2023

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Comprehending nonequilibrium electron−phonon dynamics at the microscopic level and at short time scales is one of the main goals in condensed matter physics. Effective temperature models and time-dependent Boltzmann equations are standard techniques for exploring and understanding the nonequilibrium state and the corresponding scattering channels. However, these methods consider only the time evolution of the carrier occupation function, while the self-consistent phonon dressing in each time instant coming from the nonequilibrium population is ignored, which makes them less suitable for studying ultrafast phenomena where softening of the phonon modes plays an active role. Here, we combine ab initio timedependent Boltzmann equations and many-body phonon self-energy calculations to investigate the full momentum-and mode-resolved nonadiabatic phonon renormalization picture in the MoS 2 monolayer under nonequilibrium conditions. Our results show that the nonequilibrium state of photoexcited MoS 2 is governed by the multi-valley topology of valence and conduction bands that brings about characteristic anisotropic electron−phonon thermalization paths and the corresponding phonon renormalization of strongly coupled modes around high-symmetry points of the Brillouin zone. As the carrier population is thermalized toward its equilibrium state, we track in time the evolution of the remarkable phonon anomalies induced by nonequilibrium and the overall enhancement of the phonon relaxation rates. This work shows potential guidelines to tailor the electron−phonon relaxation channels and control the phonon dynamics under extreme photoexcited conditions.

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Section: Resultsmentioning

confidence: 63%

Ultrafast Nonadiabatic Phonon Renormalization in Photoexcited Single-Layer MoS₂

2023

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“…More recently, density functional second order perturbation theory was applied to noble metals [157] Cu, Ag and Au, and has been used to understand thermal conductivity and phonon linewidths in the dichalcogenide MoS 2 [158]. A similar approach was used to show that dynamical phonon anomalies (beyond the Born-Oppenheimer approximation) can considerably modify the electron-phonon coupling strength λ and transition temperature T c in conventional superconductors [159]. First principles calculations to evaluate accurate interatomic forces was also applied to study the thermodynamics of crystals at finite temperature taking into account anharmonic effects.…”

Section: Phonon Damping From First Principlesmentioning

confidence: 99%

Anharmonic theory of superconductivity and its applications to emerging quantum materials

Setty,

Baggioli,

Zaccone

2024

J. Phys.: Condens. Matter

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The role of anharmonicity on superconductivity has often been disregarded in the past. Recently, it has been recognized that anharmonic decoherence could play a fundamental role in determining the superconducting properties (electron-phonon coupling, critical temperature, etc) of a large class of materials, including systems close to structural soft-mode instabilities, amorphous solids and metals under extreme high-pressure conditions.Here, we review recent theoretical progress on the role of anharmonic effects, and in particular certain universal properties of anharmonic damping, on superconductivity. Our focus regards the combination of microscopic-agnostic effective theories for bosonic mediators with the well-established BCS theory and Migdal-Eliashberg theory for superconductivity. We discuss in detail the theoretical frameworks, their possible implementation within first-principles methods, and the experimental probes for anharmonic decoherence. Finally, we present several concrete applications to emerging quantum materials, including hydrides, ferroelectrics and systems with charge density wave instabilities.

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“…with Π 0 (q, iν n ) the RPA polarization. The full interaction is given by I 0 (q, iν n ) = I L (q, iν n ) + v TO ph (iν n ) and hosts frequency and momentum dependent screened electron-phonon [68][69][70] and electronelectron interactions including their hybridization. We evaluate the electron dispersion within a nearestneighbor square-lattice tight binding model with a hopping of t = 1.5 eV (m * ≈ 0.1 m e ) and a chemical potential yielding approximately quarter filling.…”

Section: Formalismmentioning

confidence: 99%

Screening induced crossover between phonon- and plasmon-mediated pairing in layered superconductors

in’t Veld,

Katsnelson,

Millis

et al. 2023

2D Mater.

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Two-dimensional (2D) metals can host gapless plasmonic excitations that strongly couple to electrons and thus may significantly affect superconductivity. To investigate the dynamical interplay of the electron–electron and electron–phonon interactions in the theory of 2D superconductivity, we apply a full momentum- and frequency-dependent one-loop theory treating electron–phonon, electron–plasmon, and phonon–plasmon coupling with the same accuracy. We tune the strength of the Coulomb interaction by varying the external screening ε e x t to the layered superconductor and find three distinct regions. At weak screening, superconductivity is mediated by plasmons. In the opposite limit conventional electron–phonon interactions dominate. In between, we find a suppressed superconducting state. Our results show that even in conventional electron–phonon coupled layered materials, superconductivity can be significantly enhanced by the electron–plasmon coupling in a manner that can be controlled by the external screening.

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Dynamical renormalization of electron-phonon coupling in conventional superconductors

Cited by 6 publications

References 122 publications

Ultrafast Nonadiabatic Phonon Renormalization in Photoexcited Single-Layer MoS₂

Ultrafast Nonadiabatic Phonon Renormalization in Photoexcited Single-Layer MoS₂

Anharmonic theory of superconductivity and its applications to emerging quantum materials

Screening induced crossover between phonon- and plasmon-mediated pairing in layered superconductors

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Dynamical renormalization of electron-phonon coupling in conventional superconductors

Cited by 6 publications

References 122 publications

Ultrafast Nonadiabatic Phonon Renormalization in Photoexcited Single-Layer MoS2

Ultrafast Nonadiabatic Phonon Renormalization in Photoexcited Single-Layer MoS2

Anharmonic theory of superconductivity and its applications to emerging quantum materials

Screening induced crossover between phonon- and plasmon-mediated pairing in layered superconductors

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Product

Resources

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Ultrafast Nonadiabatic Phonon Renormalization in Photoexcited Single-Layer MoS₂

Ultrafast Nonadiabatic Phonon Renormalization in Photoexcited Single-Layer MoS₂