Evidence for superconductivity in Li-decorated monolayer graphene
| العنوان: | Evidence for superconductivity in Li-decorated monolayer graphene |
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| المؤلفون: | Douglas Wong, Giorgio Levy, Christian R. Ast, Michael Schneider, C. N. Veenstra, Carola Straßer, Pinder Dosanjh, Andrea Damascelli, Stiven Forti, Alexander Stöhr, David J. Dvorak, Ulrich Starke, Pascal Nigge, B. Ludbrook, Sergey Zhdanovich, M. Zonno |
| المصدر: | Proceedings of the National Academy of Sciences. 112:11795-11799 |
| بيانات النشر: | Proceedings of the National Academy of Sciences, 2015. |
| سنة النشر: | 2015 |
| مصطلحات موضوعية: | Superconductivity, Physics, Multidisciplinary, Condensed matter physics, Photoemission spectroscopy, Graphene, Condensed Matter - Superconductivity, Superlattice, FOS: Physical sciences, chemistry.chemical_element, Angle-resolved photoemission spectroscopy, Fermi surface, 3. Good health, law.invention, Superconductivity (cond-mat.supr-con), Condensed Matter::Materials Science, chemistry, law, Condensed Matter::Superconductivity, Pairing, Physical Sciences, Lithium |
| الوصف: | Monolayer graphene exhibits many spectacular electronic properties, with superconductivity being arguably the most notable exception. It was theoretically proposed that superconductivity might be induced by enhancing the electron-phonon coupling through the decoration of graphene with an alkali adatom superlattice [Profeta et al. Nat. Phys. 8, 131-134 (2012)]. While experiments have indeed demonstrated an adatom-induced enhancement of the electron-phonon coupling, superconductivity has never been observed. Using angle-resolved photoemission spectroscopy (ARPES) we show that lithium deposited on graphene at low temperature strongly modifies the phonon density of states, leading to an enhancement of the electron-phonon coupling of up to $\lambda\!\simeq\!0.58$. On part of the graphene-derived $\pi^*$-band Fermi surface, we then observe the opening of a $\Delta\!\simeq\!0.9$ meV temperature-dependent pairing gap. This result suggests for the first time, to our knowledge, that Li-decorated monolayer graphene is indeed superconducting with $T_c\!\simeq\!5.9 K$. Comment: Accepted. A high-resolution version with supplementary material can be found at http://qmlab.ubc.ca/ARPES/PUBLICATIONS/Articles/Graphene_Li.pdf |
| تدمد: | 1091-6490 0027-8424 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cabfb1f37633df2781b20acaa0c5c6bc https://doi.org/10.1073/pnas.1510435112 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....cabfb1f37633df2781b20acaa0c5c6bc |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 10916490 00278424 |
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