IFEG   20353
INSTITUTO DE FISICA ENRIQUE GAVIOLA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
AC fields for a new breed of carbon-based devices
Autor/es:
LUIS E. F. FOA TORRES
Lugar:
San Miguel de Tucumán
Reunión:
Congreso; IV Reunión Nacional Sólidos 2011; 2011
Institución organizadora:
Univ. Nac. de Tucumán
Resumen:
More than a century ago, the use of alternating currents (ac) sparked a revolution that changed our modern world. Today, the use of ac fields has reached the nanoscale. Here, the interplay between the quantum coherence of the electrons, inelastic effects and dynamical symmetry breaking offers fascinating opportunities for basic research and applications. The interest on time-dependent excitations by electromagnetic fields or gate voltages has been steadily growing [1] and many captivating phenomena such as photon-assisted tunneling, coherent destruction of tunnelling [2] and quantum charge pumping [3] have been unveiled. Graphene and carbon nanotubes offer an outstanding ground for these studies. Here we give a brief overview of our recent research on driven electronic transport in these materials [4,5,6]. We will try to shed light on questions such as: Is it possible to use ac fields to control the electric response (current and noise)? Could we achieve tunable bandgaps in graphene through these excitations? [1] S. Kohler, J. Lehmann, and P. Hanggi, Phys. Rep. 406, 379 (2005). [2] F. Grossmann, T. Dittrich, P. Jung, and P. Hanggi, Phys. Rev. Lett. 67, 516 (1991). [3] D. J. Thouless, Phys. Rev. B 27, 6083 (1983); M. D. Blumenthal et al., Nat. Phys. 3, 343 (2007); B. Kaestner et al., Phys. Rev. B 77, 153301 (2008); B. Kaestner et al., Appl. Phys. Lett. 94, 012106 (2009). [4] L. E. F. Foa Torres, G. Cuniberti, Appl. Phys. Lett. 94, 222103 (2009); C. G. Rocha, L. E. F. Foa Torres and G. Cuniberti Phys. Rev. B 81, 115435 (2010). [5] H. L. Calvo, H. M. Pastawski, S. Roche, and L. E. F. Foa Torres, Appl. Phys. Lett. 98, 232103 (2011). [6] L. E. F. Foa Torres, H. L. Calvo, C. G. Rocha, G. Cuniberti, to appear in Appl. Phys. Lett. (2011); full list of related publications available at http://nanocarbon.famaf.unc.edu.ar/