Back to Search
Start Over
Evidence for superconductivity in Li-decorated monolayer graphene
Evidence for superconductivity in Li-decorated monolayer graphene
- Source :
- Proceedings of the National Academy of Sciences. 112:11795-11799
- Publication Year :
- 2015
- Publisher :
- Proceedings of the National Academy of Sciences, 2015.
-
Abstract
- 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 $T_c\!\simeq\!5.9 K$.<br />Comment: Accepted. A high-resolution version with supplementary material can be found at http://qmlab.ubc.ca/ARPES/PUBLICATIONS/Articles/Graphene_Li.pdf
- Subjects :
- 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
Subjects
Details
- ISSN :
- 10916490 and 00278424
- Volume :
- 112
- Database :
- OpenAIRE
- Journal :
- Proceedings of the National Academy of Sciences
- Accession number :
- edsair.doi.dedup.....cabfb1f37633df2781b20acaa0c5c6bc
- Full Text :
- https://doi.org/10.1073/pnas.1510435112