INTEC   05402
INSTITUTO DE DESARROLLO TECNOLOGICO PARA LA INDUSTRIA QUIMICA
Unidad Ejecutora - UE
artículos
Título:
Quantum-mechanical interferences in charge exchange between hydrogen and graphene-like surfaces.
Autor/es:
M. A. ROMERO; A. IGLESIAS-GARCÍA; E. C. GOLDBERG
Revista:
JOURNAL OF PHYSICS CONDENSED MATTER
Editorial:
IOP PUBLISHING LTD
Referencias:
Lugar: Londres; Año: 2012 vol. 24 p. 1 - 9
ISSN:
0953-8984
Resumen:
The neutral to negative charge fluctuation of a hydrogen atom in front of a graphene surface is
calculated by using the Anderson model within an infinite intra atomic Coulomb repulsion
approximation. We perform an ab initio calculation of the Anderson hybridization function
that allows investigation of the effect of quantum-mechanical interference related to the Berry
phase inherent to the graphene band structure. We find that consideration of the interaction of
hydrogen on top of many C atoms leads to a marked asymmetry of the imaginary part of the
hybridization function with respect to the Fermi level. Consequently, Fano factors larger than
one and strongly dependent on the energy around the Fermi level are predicted. Moreover, the
suppression of the hybridization for energies above the Fermi level can explain the unexpected
large negative ion formation measured in the scattering of protons by graphite-like surfaces.