Properites of parametric generation pumping by Nd:YAG laser with SMAOM

Yakovin, M. D.; Yakovin, D. V.; Грибанов, А. В.

doi:10.1109/iclo48556.2020.9285690

Cited by 2 publications

(1 citation statement)

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“…Therefore, for gapped, parabolic materials, we shall assume an isotropic dispersion E(k) = 2 k 2 /(2m * ) with an effective mass m * , whereas for Dirac-like 2D crystals we shall assume E(k) = υ F k. Since we are interested in a region of the Brillouin zone in which E(k) is close to the Fermi energy, E F , these expressions are valid as long as the Fermi energy (and so the carrier density) is low enough to be in the appropriate parabolic or linear region and, for Dirac-like materials, large enough to be left unaffected by the opening of a gap due to the spin-orbit interaction. In silicene, this interaction results in the opening of a very small gap of about 1.5 meV in the buckled structure [46][47][48] at the Dirac point. This should not affect significantly our results for electron densities larger than about 6 × 10 8 cm −2 , in practice equivalent to an undoped/ungated case.…”

Section: Approximations and Physical Modelsmentioning

confidence: 99%

Superconductivity induced by flexural modes in non- σh -symmetric Dirac-like two-dimensional materials: A theoretical study for silicene and germanene

Fischetti

Polley

2018

Phys. Rev. B

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In two-dimensional crystals that lack symmetry under reflections on the horizontal plane of the lattice (non-σ h -symmetric), electrons can couple to flexural modes (ZA phonons) at first order. We show that in materials of this type that also exhibit a Dirac-like electron dispersion, the strong coupling can result in electron pairing mediated by these phonons, as long as the flexural modes are not damped or suppressed by additional interactions with a supporting substrate or gate insulator. We consider several models: The weak-coupling limit, which is applicable only in the case of gapped and parabolic materials, like stanene and HfSe2, thanks to the weak coupling; the full gap-equation, solved using the constant-gap approximation and considering statically screened interactions; its extensions to energy-dependent gap and to dynamic screening. We argue that in the case of silicene and germanene superconductivity mediated by this process can exhibit a critical temperature of a few degrees K, or even a few tens of degrees K when accounting for the effect of a high-dielectric-constant environment. We conclude that the electron/flexural-modes coupling should be included in studies of possible superconductivity in non-σ h -symmetric two-dimensional crystals, even if alternative forms of coupling are considered.

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Section: Approximations and Physical Modelsmentioning

confidence: 99%