Universität zu Köln

Ehlen, Niels ORCID: 0000-0002-8581-8359, 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:	Creators Email ORCID ORCID Put Code Ehlen, Niels nehlen@outlook.de orcid.org/0000-0002-8581-8359 UNSPECIFIED Hell, Martin UNSPECIFIED UNSPECIFIED UNSPECIFIED Marini, Giovanni UNSPECIFIED UNSPECIFIED UNSPECIFIED Hasdeo, Eddwi Hesky UNSPECIFIED orcid.org/0000-0002-4873-2927 UNSPECIFIED Saito, Riichiro UNSPECIFIED orcid.org/0000-0002-3336-9985 UNSPECIFIED Falke, Yannic UNSPECIFIED UNSPECIFIED UNSPECIFIED Goerbig, Mark Oliver UNSPECIFIED UNSPECIFIED UNSPECIFIED Di Santo, Giovanni UNSPECIFIED UNSPECIFIED UNSPECIFIED Petaccia, Luca UNSPECIFIED UNSPECIFIED UNSPECIFIED Profeta, Gianni UNSPECIFIED orcid.org/0000-0002-0535-7573 UNSPECIFIED Grueneis, Alexander UNSPECIFIED UNSPECIFIED UNSPECIFIED
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:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics II
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language TOTAL-ENERGY CALCULATIONS; RAMAN-SPECTROSCOPY; SUPERCONDUCTIVITY; FERROMAGNETISM; TEMPERATURE; SCATTERING; STATES; RANGE Multiple languages Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/35179