Superconductivity in monolayer Pb on Si(111) from first principles |
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Authors: | Jesse Noffsinger Marvin L. Cohen |
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Affiliation: | Department of Physics, University of California, Berkeley, CA 94720, United States Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States |
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Abstract: | Observation of superconductivity in a single layer of Pb on the (111) surface of bulk silicon has renewed interest in a longstanding question; can superconductivity persist to the ultimate atomic limit? Using first-principles techniques, we investigate the total electron-phonon coupling in monolayer Pb supported by a Si(111) substrate. Our ultra-fine sampling of the electronic structure, lattice dynamics and electron-phonon matrix elements in the nearly two-dimensional Brillouin zone yields a total electron-phonon coupling parameter which explains the experimentally observed superconducting transition temperature of 1.83 K [T. Zhang, et al., Nat. Phys. 6 (2010) 104]. The observed suppression of the superconducting transition temperature from the bulk value of 7.2 K is found to arise from the interplay of reduced electron-phonon matrix elements and a modification of the lattice dynamics resulting from the Pb-Si bonding. |
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Keywords: | D. Superconductivity D. Electron-phonon coupling |
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