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Phys. Rev. Lett. 104, 036805 (2010) [4 pages]

Observation of Carrier-Density-Dependent Many-Body Effects in Graphene via Tunneling Spectroscopy

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Victor W. Brar (韦小宝)1,2, Sebastian Wickenburg (魏烈钢)1, Melissa Panlasigui1, Cheol-Hwan Park1,2, Tim O. Wehling3,4, Yuanbo Zhang (张远波)1, Régis Decker1,2, Çağlar Girit1,2, Alexander V. Balatsky3, Steven G. Louie1,2, Alex Zettl1,2, and Michael F. Crommie1,2
1Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA
2Materials Sciences Division, Lawrence Berkeley Laboratory, Berkeley, California 94720, USA
3Theoretical Division and Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
41. Institut für Theoretische Physik, Universität Hamburg, D-20355 Hamburg, Germany

Received 4 November 2009; published 22 January 2010

We find the scanning tunneling spectra of backgated graphene monolayers to be significantly altered by many-body excitations. Experimental features in the spectra arising from electron-plasmon interactions show carrier density dependence, distinguishing them from density-independent electron-phonon features. Using a straightforward model, we are able to calculate theoretical tunneling spectra that agree well with our data, providing insight into the effects of many-body interactions on the lifetime of graphene quasiparticles.

© 2010 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.104.036805
DOI:
10.1103/PhysRevLett.104.036805
PACS:
73.22.-f
 
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