Staff directory

Gustavo Ceballos Mago

Head of Scienctific Technical support Divisions
gustavo.ceballos(ELIMINAR)@icn2.cat - Tel. +34937373632
Scientific-Technical Research Support

Publications

2015

  • Substrate-induced stabilization and reconstruction of zigzag edges in graphene nanoislands on Ni(111)

    Garcia-Lekue A., Olle M., Sanchez-Portal D., Palacios J.J., Mugarza A., Ceballos G., Gambardella P. Journal of Physical Chemistry C; 119 (8): 4072 - 4078. 2015. 10.1021/jp511069y. IF: 4.772

    We combine experimental observations by scanning tunneling microscopy (STM) and density functional theory (DFT) to reveal the most stable edge structures of graphene on Ni(111) as well as the role of stacking-driven activation and suppression of edge reconstruction. Depending on the position of the outermost carbon atoms relative to hollow and on-top Ni sites, zigzag edges have very different energies. Triangular graphene nanoislands are exclusively bound by the more stable zigzag hollow edges. In hexagonal nanoislands, which are constrained by geometry to alternate zigzag hollow and zigzag top edges along their perimeter, only the hollow edge is stable, whereas the top edges spontaneously reconstruct into the (57) pentagon-heptagon structure. Atomically resolved STM images are consistent with either top-fcc or top-hcp epitaxial stacking of graphene and Ni sites, with the former being favored by DFT. Finally, we find that there is a one-to-one relationship between the edge type, graphene stacking, and orientation of the graphene islands. © 2015 American Chemical Society.


2014

  • Atomic monolayer deposition on the surface of nanotube mechanical resonators

    Tavernarakis, A.; Chaste, J.; Eichler, A.; Ceballos, G.; Gordillo, M.C.; Boronat, J.; Bachtold, A. Physical Review Letters; 2014. 10.1103/PhysRevLett.112.196103. IF: 7.728


  • Spin tuning of electron-doped metal-phthalocyanine layers

    Stepanow, S.; Lodi Rizzini, A.; Krull, C.; Kavich, J.; Cezar, J.C.; Yakhou-Harris, F.; Sheverdyaeva, P.M.; Moras, P.; Carbone, C.; Ceballos, G.; Mugarza, A.; Gambardella, P. Journal of the American Chemical Society; 136 (14): 5451 - 5459. 2014. 10.1021/ja501204q. IF: 11.444


  • Spin-dependent electron scattering at graphene edges on Ni(111)

    Garcia-Lekue, A.; Balashov, T.; Olle, M.; Ceballos, G.; Arnau, A.; Gambardella, P.; Sanchez-Portal, D.; Mugarza, A. Physical Review Letters; 2014. 10.1103/PhysRevLett.112.066802. IF: 7.728


2012

  • A nanomechanical mass sensor with yoctogram resolution

    Chastem J. ; Eichler, A.; Moser, J.; Ceballos, G.; Rurali, R.; Bachtold, A. Nature Nanotechnology; 7: 301 - 304. 2012. .


  • Yield and Shape Selection of Graphene Nanoislands Grown on Ni(111)

    Olle, M. ; Ceballos, G.; Serrate, D.; Gambardella, P. Nano Letters; 12(9): 4431 - 4436. 2012. DOI: 10.1021/nl300897m.


2011

  • Localization, splitting, and mixing of field emission resonances induced by alkali metal clusters on Cu(100)

    Stepanow, S.; Mugarza, A.; Ceballos, G.; Gambardella, P.; Aldazabal, I.; Borisov, A.G.; Arnau, A. Physical Review B - Condensed Matter and Materials Physics; 83 2011. 10.1103/PhysRevB.83.115101.


  • Mixed-valence behavior and strong correlation effects of metal phthalocyanines adsorbed on metals

    Stepanow, S.; Miedema, P. S.; Mugarza, A.; Ceballos, G. ; Moras, P. ; Cezar, J. C.; Carbone, C. ; de Groot, F. M. F.; Gambardella, P. Physical Review B; 2011. .


  • Spin coupling and relaxation inside molecule-metal contacts.

    Mugarza, A.; Krull, C.; Robles, R.; Stepanow, S.; Ceballos, G.; Gambardella, P. Nature Communications; 2 2011. 10.1038/ncomms1497.


2010

  • Giant spin and orbital moment anisotropies of a Cu-phthalocyanine monolayer

    Stepanow, S.; Mugarza, A.; Ceballos, G.; Moras, P.; Cezar, J.C.; Carbone, C.; Gambardella, P. Physical Review B - Condensed Matter and Materials Physics; 82 2010. 10.1103/PhysRevB.82.014405.


  • Orbital specific chirality and homochiral self-assembly of achiral molecules induced by charge transfer and spontaneous symmetry breaking

    Mugarza, A.; Lorente, N.; Ordejón, P.; Krull, C.; Stepanow, S.; Bocquet, M.-L.; Fraxedas, J.; Ceballos, G.; Gambardella, P. Physical Review Letters; 105 2010. 10.1103/PhysRevLett.105.115702.


2007

  • Insulating ground state of Sn/Si(111)-(¿30 x¿30)R30°

    S. Modesti; L. Petaccia; G. Ceballos; I. Vobornik; G. Panaccione; G. Rossi; L. Ottaviano; R. Larciprete; S. Lizzit; A. Goldoni Physical Review Letters; 2007. .


  • Role of the electric field in surface electron dynamics above the vacuum level

    J. I. Pascual; C. Corriol; G. Ceballos; I. Aldazabal; H.-P. Rust; K. Horn; J. M. Pitarke; P. M. Echenique; A. Arnau Physical Review B; 2007. .