2015
DOI: 10.1103/physrevb.92.041407
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Controlling the electronic structure of graphene using surface-adsorbate interactions

Abstract: We show that strong coupling between graphene and the substrate is mitigated when 0.8 monolayer of Na is adsorbed and consolidated on top graphene-on-Ni(111). Specifically, the π state is partially restored near the K-point and the energy gap between the π and π* states reduced to 1.3 eV after adsorption, as measured by angle-resolved photoemission spectroscopy. We show that this change is not caused by intercalation of Na to underneath graphene but it is caused by an electronic coupling between Na on top and … Show more

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Cited by 8 publications
(7 citation statements)
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“…In order to resolve whether our ARPES spectrum of strongly n doped graphene corresponds to either adsorbed or intercalated graphene, we performed an oxygen exposure experiment. Matyaba et al [2] unambiguously demonstrated that intercalated Na is protected from oxidation by graphene so that extended exposure to oxygen does not affect the ARPES spectrum. However, when Na atoms are adsorbed on top of graphene the exposure to oxygen dramatically changes the valence-band spectrum around the K point.…”
Section: Resultsmentioning
confidence: 99%
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“…In order to resolve whether our ARPES spectrum of strongly n doped graphene corresponds to either adsorbed or intercalated graphene, we performed an oxygen exposure experiment. Matyaba et al [2] unambiguously demonstrated that intercalated Na is protected from oxidation by graphene so that extended exposure to oxygen does not affect the ARPES spectrum. However, when Na atoms are adsorbed on top of graphene the exposure to oxygen dramatically changes the valence-band spectrum around the K point.…”
Section: Resultsmentioning
confidence: 99%
“…Park et al [26] reported a complete recovery of the electronic structure of graphene from the strongly interacting Ni surface by spontaneous Na intercalation at RT. Even more recent experiments by Matyba et al [2] have convincingly demonstrated that Na adsorbs preferably on graphene on Ni(111) at RT and that intercalation takes place only at elevated temperatures. This is explained in terms of the increased mobility of Na atoms, suggesting that the diffusion of adsorbed Na from the external graphene surface to the intercalated configuration is controlled by kinetic effects, e.g., penetration through graphene defects (i.e., the wrinkles at grain boundaries) [35].…”
Section: Introductionmentioning
confidence: 99%
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“…[68][69][70] The promotion of catalytic reactions [71][72][73][74] and the increase of electron emission rates 75 belong to the appealing alkali-induced effects. It is therefore not surprising that many aspects of alkali metal adsorption have been studied, e. g., the geometric structure of superlattices, [76][77][78][79][80][81] vibrational quanta, [82][83][84][85] and lifetimes of electronic excitations [86][87][88][89][90][91][92] On graphene, adsorption of alkali metals was shown to, e. g., tune the band gap opening between the graphene Dirac cones 93,94 and modify the electronic transport. 95,96 More recently, the intercalation of alkali metals on graphene-covered surfaces has moved into a focus of surface science research.…”
Section: Resultsmentioning
confidence: 99%