Surface states resonances at the single-layer graphene/Cu(111) interface

被引：4
|
作者：
Tognolini, S. [1 ,2 ]
Pagliara, S. [1 ,2 ]
Bignardi, L. [3 ]
Ponzoni, S. [1 ,2 ]
Rudolf, P. [4 ]
Parmigiani, F. [4 ,5 ,6 ]
机构：
[1] Univ Cattolica, I LAMP, I-25121 Brescia, Italy
[2] Univ Cattolica, Dipartimento Matemat & Fis, I-25121 Brescia, Italy
[3] Univ Groningen, Zemike Inst Adv Mat, NL-9747 AG Groningen, Netherlands
[4] Univ Trieste, I-34127 Trieste, Italy
[5] Sincrotrone Trieste SCpA, Elettra, I-34149 Trieste, Italy
[6] Univ Cologne, Int Fac, D-50931 Cologne, Germany
来源：
SURFACE SCIENCE | 2016年 / 643卷
关键词：
Non-linear photoemission spectroscopy; Resonance; Surface states; Graphene/metal interface; IMAGE-POTENTIAL STATES; RESOLVED 2-PHOTON PHOTOEMISSION; ELECTRONIC STATES; METAL-SURFACES; CU(111); EXCITATION; SPECTROSCOPY; CU(100); PHASE; FANO;
D O I：
10.1016/j.susc.2015.06.021
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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.
引用
收藏
页码：210 / 213
页数：4
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