Journal
SOLID STATE COMMUNICATIONS
Volume 152, Issue 15, Pages 1456-1459Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ssc.2012.04.040
Keywords
Graphene; Electron-electron interactions; Plasmarons; Photoemission and tunneling spectroscopy
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Funding
- Italian Ministry of Education, University, and Research (MIUR) through the program FIRB - Futuro in Ricerca
- Welch Foundation [TBF1473]
- NRI SWAN program
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We calculate the tunneling density-of-states (DOS) of a disorder-free two-dimensional interacting electron system with a massless-Dirac band Hamiltonian. The DOS exhibits two main features: (i) linear growth at large energies with a slope that is suppressed by quasiparticle velocity enhancement, and (ii) a rich structure of plasmaron peaks which appear at negative bias voltages in an n-doped sample and at positive bias voltages in a p-doped sample. We predict that the DOS at the Dirac point is non-zero even in the absence of disorder because of electron-electron interactions, and that it is then accurately proportional to the Fermi energy. The finite background DOS observed at the Dirac point of graphene sheets and topological insulator surfaces can therefore be an interaction effect rather than a disorder effect. (c) 2012 Elsevier Ltd. All rights reserved.
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