Artículos de revistas
Quantum-mechanical interference in charge exchange between hydrogen and graphene-like surfaces
Fecha
2012-01Registro en:
Romero, Marcelo Ariel; Iglesias Garcia, Adalberto de Jesus; Goldberg, Edith Catalina; Quantum-mechanical interference in charge exchange between hydrogen and graphene-like surfaces; Iop Publishing; Journal Of Physics: Condensed Matter; 24; 1-2012; 45004-45013
0953-8984
Autor
Romero, Marcelo Ariel
Iglesias Garcia, Adalberto de Jesus
Goldberg, Edith Catalina
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.