First-principles calculation of the electron-phonon coupling in ultrathin Pb superconductors: Suppression of the transition temperature by surface phonons

Jesse Noffsinger; Marvin L. Cohen

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First-principles calculation of the electron-phonon coupling in ultrathin Pb superconductors: Suppression of the transition temperature by surface phonons

机译：超薄铅超导体中电子-声子耦合的第一性原理计算：表面声子对转变温度的抑制

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We present a first-principles calculation of the electron-phonon coupling for thin layered lead systems. Using our Wannier-Fourier approach we show that the superconductivity in these systems is accounted for by traditional isotropic Migdal-Eliasberg theory through phonon-induced electron pairing. It is found that the transition temperature of Pb is suppressed by the presence of surface phonons which have been stiffened by an increased electronic spring constant. Superconductivity persists in ultrathin layered Pb despite the suppression from a decreased electronic density of states and weakened coupling to surface phonons.

机译：我们介绍了薄层铅系统电子-声子耦合的第一性原理计算。使用我们的Wannier-Fourier方法，我们证明了这些系统中的超导性是由传统的各向同性Migdal-Eliasberg理论通过声子感应电子配对来解释的。已经发现，由于表面声子的存在而抑制了Pb的转变温度，该表面声子已被增加的电子弹簧常数所加强。尽管降低了态的电子密度和减弱了与表面声子的耦合，但超导性仍然存在于超薄层Pb中。

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《Physical review》 |2010年第21期|P.214519.1-214519.4|共4页
作者
Jesse Noffsinger; Marvin L. Cohen;
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Department of Physics, University of California, Berkeley, California 94720, USA Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA;

rnDepartment of Physics, University of California, Berkeley, California 94720, USA Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA;

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superconducting films and low-dimensional structures; phonons;

机译：超导膜和低维结构;声子;

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First-principles calculation of the electron-phonon coupling in ultrathin Pb superconductors: Suppression of the transition temperature by surface phonons

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