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首页> 外文期刊>Physical review >Superconductivity in the two-dimensional electron gas induced by high-energy optical phonon mode and large polarization of the SrTiO_3 substrate
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Superconductivity in the two-dimensional electron gas induced by high-energy optical phonon mode and large polarization of the SrTiO_3 substrate

机译：高能光学声子模和SrTiO_3衬底的大极化在二维电子气中的超导性

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摘要

Pairing in one-atomic-layer-thick two-dimensional electron gas (2DEG) by a single flat band of high-energy longitudinal optical phonons is considered. The polar dielectric SrTiO_3 (STO) exhibits such an energetic phonon mode and the 2DEG is created both when one unit cell FeSe layer is grown on its (100) surface and on the interface with another dielectric like LaAlO_3 (LAO). We obtain a quantitative description of both systems solving the gap equation for T_c for arbitrary Fermi energy ∈_F, electron-phonon coupling λ, and the phonon frequency Ω, and direct (random-phase approximation) electron-electron repulsion strength α. The focus is on the intermediate region between the adiabatic, ∈_F ＞＞ Ω, and the nonadiabatic, ∈_F ＜＜ Ω, regimes. The high-temperature superconductivity in single-unit-cell FeSe/STO is possible due to a combination of three factors: high-longitudinal-optical phonon frequency, large electron-phonon coupling λ ～ 0.5, and huge dielectric constant of the substrate suppression the Coulomb repulsion. It is shown that very low density electron gas in the interfaces is still capable of generating superconductivity of the order of 0.1 K in LAO/STO.
机译：考虑通过高能纵向光子的单个平坦带在一个原子层厚的二维电子气（2DEG）中配对。极性电介质SrTiO_3（STO）表现出这种高能声子模式，并且当一个单位晶格的FeSe层在其（100）表面以及与另一电介质（如LaAlO_3（LAO））的界面上生长时，就会生成2DEG。我们获得了两个系统的定量描述，它们针对任意费米能量∈_F，电子-声子耦合λ和声子频率Ω，以及直接（随机相位近似）电子-电子排斥强度α求解了T_c的间隙方程。重点是绝热ε_F＞＞Ω和非绝热∈_F＜＜Ω的中间区域。单晶胞FeSe / STO中的高温超导性可能是由于以下三个因素的组合：高纵向光子声子频率，大电子声子耦合λ〜0.5和巨大的介电常数抑制了衬底库仑排斥。结果表明，在LAO / STO中，界面中的极低密度电子气仍能够产生0.1 K量级的超导性。

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  • 来源
    《Physical review》 |2016年第2期|024505.1-024505.11|共11页
  • 作者

    Baruch Rosenstein; B. Ya. Shapiro; I. Shapiro; Dingping Li;

  • 作者单位

    Electrophysics Department, National Chiao Tung University, Hsinchu 30050, Taiwan, R.O.C.,Physics Department, Ariel University, Ariel 40700, Israel;

    Physics Department, Bar-Ilan University, 52900 Ramat-Gan, Israel;

    Physics Department, Bar-Ilan University, 52900 Ramat-Gan, Israel;

    School of Physics, Peking University, Beijing 100871, China,Collaborative Innovation Center of Quantum Matter, Beijing, China;

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