Improvement of scanning tunneling microscopy resolution with H-sensitized tips
Entity
UAM. Departamento de Física Teórica de la Materia CondensadaDate
2012-06-13Citation
10.1103/PhysRevLett.108.246102
Physical Review Letters 108.24 (2012): 246102
ISSN
0031-9007 (print); 1079-7114 (online)DOI
10.1103/PhysRevLett.108.246102Funded by
This work is supported by Spanish MICIIN under Contract No. FIS2010-16046, the CAM under Contract No. S2009/MAT-1467, and the European Project MINOTOR (Grant No. FP7-NMP-228424). J. I. M. acknowledges funding from Spanish MICINN through Juan de la Cierva Program, E. A. the financial support by Consejería de Educación de la CAM, FSE, and European Project MINOTOR, and C. G. the CSIC JAEProject
Comunidad de Madrid. S2009/MAT-1467/NANOOBJETOS; info:eu-repo/grantAgreement/EC/FP7/228424Editor's Version
http://dx.doi.org/10.1103/PhysRevLett.108.246102Subjects
FísicaRights
© 2012 American Physical SocietyAbstract
Recent scanning tunneling hydrogen microscopy (STHM) experiments on PTCDA (perylene-3,4,9,10- tetracarboxylic-3,4,9,10-dianhydride)/Au(111) have shown unprecedented intramolecular and intermolecular spatial resolution. The origin of this resolution is studied using an accurate STHM theoretical simulation technique that includes a detailed description of the electronic structure of both the tip and sample. Our results show that H2 molecules are dissociated on the Au tip; the adsorbed H atoms change the density of states at the Fermi level (EF) of the tip, increasing its p-orbital character and reducing the s-orbital contribution. Also, due to the interaction with the H-decorated tip, EF is shifted to the middle of the PTCDA lowest unoccupied molecular orbital peak, increasing dramatically the density of states of the sample at EF. These effects give rise to the enhanced STHM resolution
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Google Scholar:Martínez, J. I.
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Abad González, Enrique
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González, C.
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Flores Sintas, Fernando
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Ortega Mateo, José
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- Producción científica de la UAM [20702]
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