Ehlen, Niels, Hell, Martin, Marini, Giovanni, Hasdeo, Eddwi Hesky ORCID: 0000-0002-4873-2927, Saito, Riichiro ORCID: 0000-0002-3336-9985, Falke, Yannic, Goerbig, Mark Oliver, Di Santo, Giovanni, Petaccia, Luca, Profeta, Gianni ORCID: 0000-0002-0535-7573 and Grueneis, Alexander (2020). Origin of the Flat Band in Heavily Cs-Doped Graphene. ACS Nano, 14 (1). S. 1055 - 1070. WASHINGTON: AMER CHEMICAL SOC. ISSN 1936-086X

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Abstract

A flat energy dispersion of electrons at the Fermi level of a material leads to instabilities in the electronic system and can drive phase transitions. Here we show that the flat band in graphene can be achieved by sandwiching a graphene monolayer by two cesium (Cs) layers. We investigate the flat band by a combination of angle-resolved photoemission spectroscopy experiment and the calculations. Our work highlights that charge transfer, zone folding of graphene bands, and the covalent bonding between C and Cs atoms are the origin of the flat energy band formation. Analysis of the Stoner criterion for the flat band suggests the presence of a ferromagnetic instability. The presented approach is an alternative route for obtaining flat band materials to twisting bilayer graphene which yields thermodynamically stable flat band materials in large areas.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Ehlen, NielsUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hell, MartinUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Marini, GiovanniUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hasdeo, Eddwi HeskyUNSPECIFIEDorcid.org/0000-0002-4873-2927UNSPECIFIED
Saito, RiichiroUNSPECIFIEDorcid.org/0000-0002-3336-9985UNSPECIFIED
Falke, YannicUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Goerbig, Mark OliverUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Di Santo, GiovanniUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Petaccia, LucaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Profeta, GianniUNSPECIFIEDorcid.org/0000-0002-0535-7573UNSPECIFIED
Grueneis, AlexanderUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-351799
DOI: 10.1021/acsnano.9b08622
Journal or Publication Title: ACS Nano
Volume: 14
Number: 1
Page Range: S. 1055 - 1070
Date: 2020
Publisher: AMER CHEMICAL SOC
Place of Publication: WASHINGTON
ISSN: 1936-086X
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
TOTAL-ENERGY CALCULATIONS; RAMAN-SPECTROSCOPY; SUPERCONDUCTIVITY; FERROMAGNETISM; TEMPERATURE; SCATTERING; STATES; RANGEMultiple languages
Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, MultidisciplinaryMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/35179

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