Seminário do Departamento de Física dos Materiais e Mecânica – FMT
“Electron quantum optics with graphene-based nanostructures”
Dr. Pedro Brandimarte Donostia (International Physics Center (DIPC), Spain)
Dia: 02 de maio, quarta-feira, às 16h.
Local: Sala de Seminários José Roberto Leite Edifício Alessandro Volta (bloco C), IFUSP.
Abstract:
Graphene nanoribbons (GNRs) are strong candidates as components in future nanoelectronics, since they incorporate some of the remarkable properties from graphene while are predicted to present a band gap.[1] More than a theoretical speculation, these structures can be fabricated nowadays via on-surface synthesis of chemically customized molecular precursors, reaching lengths up to 200 nm and free of defects.[2] This bottom-up method allows to precisely tune the GNRs electronic structure through structural control (edge structure and width)[3] and/or via chemical doping.[4-5] Together with these experimental breakthroughs a major effort has been devoted to the development of theoretical and computational methods to accomplish reliable quantum transport simulations. In this talk I will present na overview of our contributions in this field, including two prototypedevices: an electron analog of a Fabry-Perot resonator[4] and a tunable electronic beam splitter[6]. Our calculations illustrate the emerging of picture of GNR-based materials as an ideal platform for electron quantum optics.
[1] L. Yang, C.-H. Park, Y.-W. Son, M. Cohen, and S. Louie., Phys. Rev. Lett. 99, 186801 (2007).
[2] J. Cai, P. Ruffieux, R. Jaafar, M. Bieri, T. Braun, S. Blankenburg, M. Muoth, A. Seitsonen, M. Saleh, X. Feng, K. Müllen, and R. Fasel, Nature 466, 470-473 (2010).
[3] N. Merino-Díez, A. Garcia-Lekue, E. Carbonell-Sanromà, J. Li, M. Corso, L. Colazzo, F. Sedona, D. Sánchez-Portal, J. I. Pascual, and D. G. de Oteyza, ACS Nano 11(11), 11661-11668 (2017).
[4] E. Carbonell-Sanromà, P. Brandimarte, R. Balog, M. Corso, S. Kawai, A. Garcia-Lekue, S. Saito, S. Yamaguchi, E. Meyer, D. Sánchez-Portal, and J. I. Pascual, Nano Letters 17(1), 50-56 (2017).
[5] E. Carbonell-Sanromà, J. Hieulle, M. Vilas-Varela, P. Brandimarte, M. Iraola, A. Barragán, J. Li, M. Abadia, M. Corso, D. SánchezPortal, D. Peña, and J. I. Pascual, ACS Nano 11(7), 7355-7361 (2017).
[6] P. Brandimarte, M. Engelund, N. Papior, A. Garcia-Lekue, T. Frederiksen, D. Sánchez-Portal, J. Chem. Phys. 146, 092318 (2017).
