Observation of Plasmarons in Quasi-Freestanding Doped Graphene
Year: 2010
Type: article
Abstract: A hallmark of graphene is its unusual conical band structure that leads to a zero-energy band gap at a single Dirac crossing point. By measuring the spectral function of charge carriers in quasi-freestanding graphene with angle-resolved photoemission spectroscopy, we showed that at finite doping, this well-known linear Dirac spectrum does not provide a full description of the charge-carrying excitations. We observed composite "plasmaron" particles, which are bound states of charge carriers with plasmons, the density oscillations of the graphene electron gas. The Dirac crossing point is resolved into three crossings: the first between pure charge bands, the second between pure plasmaron bands, and the third a ring-shaped crossing between charge and plasmaron bands.
Source: Science
Institutions: Lawrence Berkeley National Laboratory, Advanced Light Source, Friedrich-Alexander-Universität Erlangen-Nürnberg, Fritz Haber Institute of the Max Planck Society, Scuola Normale Superiore, Istituto Nanoscienze, National Enterprise for NanoScience and NanoTechnology, Institute for Research in Fundamental Sciences, The University of Texas at Austin
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2019885507