Universität zu Köln

Tognolini, S., Pagliara, S., Bignardi, L., Ponzoni, S., Rudolf, P. and Parmigiani, F. (2016). Surface states resonances at the single-layer graphene/Cu(111) interface. Surf. Sci., 643. S. 210 - 214. AMSTERDAM: ELSEVIER SCIENCE BV. ISSN 1879-2758

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Abstract

By tuning the laser photon energy in the non-linear two-photons photoemission at a single-layer graphene/Cu(111) interface, it is possible to observe a strong resonance at h upsilon = 3.5 eV along with a weaker one at h upsilon = 3.85 eV. The main resonance photon energy is consistent with a direct optical transition between the occupied Cu(111) Shockley surface state and the n = 1 image potential state, located in the real gap-space between the single-layer graphene and the Cu( Ill) surface. The large amplitude of this resonance unveils a high value of the electric dipole matrix element integral that governs this transition. Furthermore, the Lorentzian shape of this resonance implies that these two states are decoupled from the continuum of states and the lifetime of the image potential state can be estimated. (C) 2015 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Tognolini, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pagliara, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bignardi, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ponzoni, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rudolf, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Parmigiani, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-292107
DOI:	10.1016/j.susc.2015.06.021
Journal or Publication Title:	Surf. Sci.
Volume:	643
Page Range:	S. 210 - 214
Date:	2016
Publisher:	ELSEVIER SCIENCE BV
Place of Publication:	AMSTERDAM
ISSN:	1879-2758
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language IMAGE-POTENTIAL STATES; RESOLVED 2-PHOTON PHOTOEMISSION; ELECTRONIC STATES; METAL-SURFACES; CU(111); EXCITATION; SPECTROSCOPY; CU(100); PHASE; FANO Multiple languages Chemistry, Physical; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/29210