Origin of the Flat Band in Heavily Cs-Doped Graphene
Source abstract
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.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Graphene research and applications · 2D Materials and Applications · Boron and Carbon Nanomaterials Research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, 50937 Cologne, Germany
Department of Physical and Chemical Sciences and SPIN-CNR, University of L’Aquila, Via Vetoio 10, I-67100 Coppito, Italy
Research Center for Physics, Indonesian Institute of Sciences, Kawasan Puspiptek Serpong, Tangerang Selatan, 15314, Indonesia
Department of Physics, Tohoku University, Sendai 980-8578, Japan
Laboratoire de Physique des Solides, CNRS UMR 8502, Université Paris-Saclay, 91405 Orsay Cedex, France
Elettra Sincrotrone Trieste, Strada Statale 14 km 163.5, 34149 Trieste, Italy
Funding
Deutscher Akademischer Austauschdienst · Deutsche Forschungsgemeinschaft · Japan Society for the Promotion of Science · H2020 Excellent Science · Quantum Matter and Materials
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