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T Katsouleas - One of the best experts on this subject based on the ideXlab platform.
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particle in cell simulations of raman Forward Scattering from short pulse high intensity lasers
Physical Review E, 1994Co-Authors: C D Decker, W B Mori, T KatsouleasAbstract:We present one- and two-dimensional particle-in-cell simulations of short-pulse (\ensuremath{\tau}1 ps) high-intensity (I\ensuremath{\le}${10}^{18}$ W/${\mathrm{cm}}^{2}$) laser propagation through an underdense plasma. The simulations model near-term experiments without the limitations of the fluid and quasistatic approximations. We find that Raman Forward Scattering plays a dominant role in the evolution of the pulse in distances less than a Rayleigh length. Raman Forward Scattering results in significant spectral cascading and energetic electron generation from wave breaking of the resulting plasma wave. Both of these effects should be useful as experimental diagnostics.
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raman Forward Scattering of short pulse high intensity lasers
Physical Review Letters, 1994Co-Authors: W B Mori, C D Decker, D E Hinkel, T KatsouleasAbstract:Raman Forward Scattering of short-pulse relativistic-intensity laser pulses is investigated. Differential equations which model the instability for arbitrarily large pump strengths are derived. Exact solutions are obtained for a set of physically relevant initial conditions. The growth rate is found to asymptotically approach zero for ultrarelativistic laser intensities. The relevance of the results to present experiments and the limitations of the quasistatic equations are discussed
O V Dolgov - One of the best experts on this subject based on the ideXlab platform.
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the electron phonon interaction with Forward Scattering peak is dominant in high t c superconductors of fese films on tio2
New Journal of Physics, 2017Co-Authors: M L Kulic, O V DolgovAbstract:The theory of the electron–phonon interaction (EPI) with strong Forward Scattering peak (FSP) in an extreme delta-peak limit (Kulic and Zeyher 1994 Phys. Rev. B 49 4395; Kulic 2000 Phys. Rep. 38 1–264; Kulic and Dolgov 2005 Phys. Status Solidi b 242 151; Danylenko et al 1999 Eur. Phys. J. B 9 201) is recently applied in (Lee et al 2014 Nature 515 245; Rademaker et al 2016 New J. Phys. 18 022001; Wang et al 2016 Supercond. Sci. Technol. 29 054009) for the explanation of high in a monolayer FeSe grown on (Lee et al 2014 Nature 515 245) and TiO2 (Rebec et al 2016 arXiv:1606.09358v1) substrates. The EPI is due to a long-range dipolar electric field created by high-energy oxygen vibrations ( meV) at the interface (Lee et al 2014 Nature 515 245; Rademaker et al 2016 New J. Phys. 18 022001; Wang et al 2016 Supercond. Sci. Technol. 29 054009). In leading order (with respect to ) the mean-field critical temperature ~ and the gap are due to an interplay between the maximal EPI pairing potential and the FSP-width q c. For K one has meV in a satisfactory agreement with ARPES experiments. In leading order T c0 is mass-independent and a very small oxygen isotope effect is expected in next to leading order. In clean systems T c0 for s-wave and d-wave pairing is degenerate but both are affected by non-magnetic impurities, which are pair-weakening in the s-channel and pair-breaking in the d-channel. The self-energy and replica bands at T = 0 and at the Fermi surface are calculated and compared with experimental results at ( Rademaker et al 2016 New J. Phys. 18 022001; Wang et al 2016 Supercond. Sci. Technol. 29 054009). The EPI coupling constant is mass-dependent () and at makes the slope of the self-energy and the replica intensities mass-dependent. This result, overlooked in the literature, is contrary to the prediction of the standard Migdal–Eliashberg theory for EPI. The small oxygen isotope effect in and pronounced isotope effect in and ARPES spectra A i of the replica bands in FeSe films on SrTiO3 and TiO2 is a smoking-gun experiment for validity of the EPI–FSP theory to these systems. The EPI–FSP theory predicts a large number of low-laying pairing states, thus causing internal pair fluctuations. The latter reduce T c0 additionally, by creating a pseudogap state for . Possibilities to increase T c0, by designing novel structures are discussed in the framework of the EPI–FSP theory.
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dominance of the electron phonon interaction with Forward Scattering peak in high tc superconductors theoretical explanation of the arpes kink
Physical Review B, 2005Co-Authors: M L Kulic, O V DolgovAbstract:The angle-resolved photoelectron spectroscopy sARPESd spectra in high-Tc superconductors show four distinctive features in the quasiparticle self-energy Ssk , vd. They can be explained consistently by the phenomenological microscopic theory in which the electron-phonon interaction with the Forward-Scattering peak dominates over the Coulomb Scattering. This theory explains why there is no shift of the nodal kink at 70 meV in the superconducting state, contrary to the observed shift of the antinodal singularity at 40 meV. The theory predicts a kneelike structure of uIm Ssvdu=uIm Sphsvd +I mS C svdu, which is phonon dominated, uIm Ssvph duScattering. ARPES spectra give lph. 1—which is obtained from Re S, and lC, 0.4—obtained from Im S, i.e., lph @l C. The dip-hump structure in the spectral function AskF, vd comes out naturally from the proposed theory.
Steven Johnston - One of the best experts on this subject based on the ideXlab platform.
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phonon linewidth due to electron phonon interactions with strong Forward Scattering in fese thin films on oxide substrates
Physical Review B, 2017Co-Authors: Yan Wang, Louk Rademaker, Elbio Dagotto, Steven JohnstonAbstract:The discovery of an enhanced superconducting transition temperature ${T}_{c}$ in monolayers of FeSe grown on several oxide substrates has opened a different route to high-${T}_{c}$ superconductivity through interface engineering. One proposal for the origin of the observed enhancement is an electron-phonon $(e$-ph) interaction across the interface that is peaked at small momentum transfers. In this paper, we examine the implications of such a coupling on the phononic properties of the system. We show that a strong Forward Scattering leads to a sizable broadening of phonon line shape, which may result in charge instabilities at long wavelengths. However, we further find that the inclusion of Coulombic screening significantly reduces the phonon broadening. Our results show that one might not expect anomalously broad phonon linewidths in the FeSe interface systems, despite the fact that the $e$-ph interaction has a strong peak in the Forward-Scattering (small $\mathbf{q})$ direction.
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aspects of electron phonon interactions with strong Forward Scattering in fese thin films on srtio3 substrates
Superconductor Science and Technology, 2016Co-Authors: Yan Wang, Louk Rademaker, Ken Nakatsukasa, Tom Berlijn, Steven JohnstonAbstract:Mono- and multilayer FeSe thin films grown on SrTiO3 and BiTiO3 substrates exhibit a greatly enhanced superconductivity over that found in bulk FeSe. A number of proposals have been advanced for the mechanism of this enhancement. One possibility is the introduction of a cross-interface electron–phonon (e–ph) interaction between the FeSe electrons and oxygen phonons in the substrates that is peaked in the Forward Scattering (small direction due to the two-dimensional nature of the interface system. Motivated by this, we explore the consequences of such an interaction on the superconducting state and electronic structure of a two-dimensional system using Migdal–Eliashberg (ME) theory. This interaction produces not only deviations from the expectations of conventional phonon-mediated pairing but also replica structures in the spectral function and density of states, as probed by angle-resolved photoemission spectroscopy, scanning tunneling microscopy/spectroscopy, and quasiparticle interference imaging. We also discuss the applicability of ME theory for a situation where the e–ph interaction is peaked at small momentum transfer and in the FeSe/STO system.
W B Mori - One of the best experts on this subject based on the ideXlab platform.
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particle in cell simulations of raman Forward Scattering from short pulse high intensity lasers
Physical Review E, 1994Co-Authors: C D Decker, W B Mori, T KatsouleasAbstract:We present one- and two-dimensional particle-in-cell simulations of short-pulse (\ensuremath{\tau}1 ps) high-intensity (I\ensuremath{\le}${10}^{18}$ W/${\mathrm{cm}}^{2}$) laser propagation through an underdense plasma. The simulations model near-term experiments without the limitations of the fluid and quasistatic approximations. We find that Raman Forward Scattering plays a dominant role in the evolution of the pulse in distances less than a Rayleigh length. Raman Forward Scattering results in significant spectral cascading and energetic electron generation from wave breaking of the resulting plasma wave. Both of these effects should be useful as experimental diagnostics.
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raman Forward Scattering of short pulse high intensity lasers
Physical Review Letters, 1994Co-Authors: W B Mori, C D Decker, D E Hinkel, T KatsouleasAbstract:Raman Forward Scattering of short-pulse relativistic-intensity laser pulses is investigated. Differential equations which model the instability for arbitrarily large pump strengths are derived. Exact solutions are obtained for a set of physically relevant initial conditions. The growth rate is found to asymptotically approach zero for ultrarelativistic laser intensities. The relevance of the results to present experiments and the limitations of the quasistatic equations are discussed
C D Decker - One of the best experts on this subject based on the ideXlab platform.
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particle in cell simulations of raman Forward Scattering from short pulse high intensity lasers
Physical Review E, 1994Co-Authors: C D Decker, W B Mori, T KatsouleasAbstract:We present one- and two-dimensional particle-in-cell simulations of short-pulse (\ensuremath{\tau}1 ps) high-intensity (I\ensuremath{\le}${10}^{18}$ W/${\mathrm{cm}}^{2}$) laser propagation through an underdense plasma. The simulations model near-term experiments without the limitations of the fluid and quasistatic approximations. We find that Raman Forward Scattering plays a dominant role in the evolution of the pulse in distances less than a Rayleigh length. Raman Forward Scattering results in significant spectral cascading and energetic electron generation from wave breaking of the resulting plasma wave. Both of these effects should be useful as experimental diagnostics.
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raman Forward Scattering of short pulse high intensity lasers
Physical Review Letters, 1994Co-Authors: W B Mori, C D Decker, D E Hinkel, T KatsouleasAbstract:Raman Forward Scattering of short-pulse relativistic-intensity laser pulses is investigated. Differential equations which model the instability for arbitrarily large pump strengths are derived. Exact solutions are obtained for a set of physically relevant initial conditions. The growth rate is found to asymptotically approach zero for ultrarelativistic laser intensities. The relevance of the results to present experiments and the limitations of the quasistatic equations are discussed