Quantum Theory of Conducting Matter

Fujita, Shigeji; Ito, Kei; Godoy, Salvador

doi:10.1007/978-0-387-88211-6

Cited by 28 publications

(33 citation statements)

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“…This can be done, e.g. via a perturbative expansion of the unitary evolution operatorÛ (t) = T exp −i −1 t 0 dt Ĥ ±q (t ) in the powers ofg q [41]. The leading order correction to the action is O(g 2 q ) and is easily found as:…”

Section: Parametric Amplification Of Phonon-mediated Electron-elmentioning

confidence: 99%

Theory of parametrically amplified electron-phonon superconductivity

et al. 2017

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Ultrafast optical manipulation of ordered phases in strongly correlated materials is a topic of significant theoretical, experimental, and technological interest. Inspired by a recent experiment on light-induced superconductivity in fullerenes [Mitrano et al., Nature 530, 2016], we develop a comprehensive theory of light-induced superconductivity in driven electron-phonon systems with lattice nonlinearities. In analogy with the operation of parametric amplifiers, we show how the interplay between the external drive and lattice nonlinearities lead to significantly enhanced effective electron-phonon couplings. We provide a detailed and unbiased study of the nonequilibrium dynamics of the driven system using the real-time Green's function technique. To this end, we develop a Floquet generalization of the Migdal-Eliashberg theory and derive a numerically tractable set of quantum Floquet-Boltzmann kinetic equations for the coupled electron-phonon system. We study the role of parametric phonon generation and electronic heating in destroying the transient superconducting state. Finally, we predict the transient formation of electronic Floquet bands in time-and angle-resolved photoemission spectroscopy experiments as a consequence of the proposed mechanism.

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Section: Parametric Amplification Of Phonon-mediated Electron-elmentioning

confidence: 99%

Theory of parametrically amplified electron-phonon superconductivity

et al. 2017

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“…6,9 A Fermi surface with any complexity can give rise to opposite signs. 14,15 Band structure calculations and photoemission spectroscopy show small electron Fermi surfaces with an enhanced effective mass at the ⌫ point and a large hole Fermi surface around the R point. 15,16 Figure 4 shows that R H for films on LSAT and LaAlO 3 exhibits a strong temperature dependence, inconsistent with normal metallic behavior, which indicates temperature-dependent scattering times and/or carrier concentrations/asymmetry.…”

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confidence: 98%

Low-dimensional Mott material: Transport in ultrathin epitaxial LaNiO3 films

Son¹,

Moetakef²,

LeBeau³

et al. 2010

Applied Physics Letters

205

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Electrical resistivity and magnetotransport are explored for thin (3–30 nm), epitaxial LaNiO3 films. Films were grown on three different substrates to obtain LaNiO3 films that are coherently strained, with different signs and magnitude of film strain. It is shown that d-band transport is inhibited as the layers progress from compression to tension. The Hall coefficient is “holelike.” Increasing tensile strain causes the film resistivity to increase, causing strong localization to appear below a critical thickness.

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“…The conductivity σ based on the pairon carrier model is calcullated as follows. The pairons move in 2D with the linear dispersion relation (Fujita et al, 2009):…”

Section: Multi-walled Nanotubes (Mwnt)mentioning

confidence: 99%