Symmetry lowering of pentacene molecular states interacting with a Cu surface

被引:28
作者
Baldacchini, Chiara [1 ,2 ,3 ]
Mariani, Carlo [3 ]
Betti, Maria Grazia [3 ]
Vobornik, Ivana [4 ]
Fujii, Jun [4 ]
Annese, Emilia [4 ]
Rossi, Giorgio [4 ]
Ferretti, Andrea [5 ]
Calzolari, Arrigo [5 ]
Di Felice, Rosa [5 ]
Ruini, Alice [5 ]
Molinari, Elisa [5 ]
机构
[1] Univ Tuscia, Biophys & Nanosci Ctr, I-01100 Viterbo, Italy
[2] Univ Tuscia, CNISM, I-01100 Viterbo, Italy
[3] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy
[4] INFM CNR TASC Lab, I-34012 Trieste, Italy
[5] Univ Modena & Reggio Emilia, INFM CNR S3, Natl Ctr nanoStruct & bioSyst Surfaces, I-41100 Modena, Italy
关键词
D O I
10.1103/PhysRevB.76.245430
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Pentacene adsorbed on the Cu(119) vicinal surface forms long-range ordered chain structures. Photoemission spectroscopy measurements and ab initio density functional theory simulations provide consistent evidences that pentacene molecular orbitals mix with the copper bands, giving rise to interaction states localized at the interface. Angular-resolved and polarization dependent photoemission spectroscopy shows that most of the pentacene derived intensity is strongly dichroic. The symmetry of the molecular states of the free pentacene molecules is reduced upon adsorption on Cu(119), as a consequence of the molecule-metal interaction. Theoretical results show a redistribution of the charge density in pi molecular states close to the Fermi level, consistent with the photoemission intensities (density of states) and polarization dependence (orbital symmetry).
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页数:7
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