Electrons with a linear energy/momentum dispersion are called massless Dirac electrons and represent the low-energy excitations in exotic materials such as graphene and topological insulators. Dirac electrons are characterized by notable properties such as a high mobility, a tunable density and, in topological insulators, a protection against backscattering through the spin–momentum locking mechanism. All those properties make graphene and topological insulators appealing for plasmonics applications. However, Dirac electrons are expected to present also a strong nonlinear optical behaviour. This should mirror in phenomena such as electromagnetic-induced transparency and harmonic generation. Here we demonstrate that in Bi2Se3 topological insulator, an electromagnetic-induced transparency is achieved under the application of a strong terahertz electric field. This effect, concomitantly determined by harmonic generation and charge-mobility reduction, is exclusively related to the presence of Dirac electron at the surface of Bi2Se3, and opens the road towards tunable terahertz nonlinear optical devices based on topological insulator materials.

Strong nonlinear terahertz response induced by Dirac surface states in Bi 2 Se 3 topological insulator / Giorgianni, Flavio; Chiadroni, Enrica; Rovere, Andrea; CESTELLI GUIDI, Mariangela; Perucchi, Andrea; Bellaveglia, Marco; Castellano, Michele; DI GIOVENALE, Domenico; Di Pirro, Giampiero; Ferrario, Massimo; Pompili, Riccardo; Vaccarezza, Cristina; Villa, Fabio; Cianchi, Alessandro; Mostacci, Andrea; Petrarca, Massimo; Brahlek, Matthew; Koirala, Nikesh; Oh, Seongshik; Lupi, Stefano. - In: NATURE COMMUNICATIONS. - ISSN 2041-1723. - ELETTRONICO. - 7:(2016), p. 11421. [10.1038/ncomms11421]

Strong nonlinear terahertz response induced by Dirac surface states in Bi 2 Se 3 topological insulator

GIORGIANNI, FLAVIO;Chiadroni, Enrica;CESTELLI GUIDI, MARIANGELA;BELLAVEGLIA, MARCO;DI GIOVENALE, DOMENICO;FERRARIO, MASSIMO;VACCAREZZA, CRISTINA;MOSTACCI, Andrea;PETRARCA, MASSIMO;LUPI, Stefano
2016

Abstract

Electrons with a linear energy/momentum dispersion are called massless Dirac electrons and represent the low-energy excitations in exotic materials such as graphene and topological insulators. Dirac electrons are characterized by notable properties such as a high mobility, a tunable density and, in topological insulators, a protection against backscattering through the spin–momentum locking mechanism. All those properties make graphene and topological insulators appealing for plasmonics applications. However, Dirac electrons are expected to present also a strong nonlinear optical behaviour. This should mirror in phenomena such as electromagnetic-induced transparency and harmonic generation. Here we demonstrate that in Bi2Se3 topological insulator, an electromagnetic-induced transparency is achieved under the application of a strong terahertz electric field. This effect, concomitantly determined by harmonic generation and charge-mobility reduction, is exclusively related to the presence of Dirac electron at the surface of Bi2Se3, and opens the road towards tunable terahertz nonlinear optical devices based on topological insulator materials.
2016
Biochemistry, Genetics and Molecular Biology (all); Chemistry (all); Physics and Astronomy (all)
01 Pubblicazione su rivista::01a Articolo in rivista
Strong nonlinear terahertz response induced by Dirac surface states in Bi 2 Se 3 topological insulator / Giorgianni, Flavio; Chiadroni, Enrica; Rovere, Andrea; CESTELLI GUIDI, Mariangela; Perucchi, Andrea; Bellaveglia, Marco; Castellano, Michele; DI GIOVENALE, Domenico; Di Pirro, Giampiero; Ferrario, Massimo; Pompili, Riccardo; Vaccarezza, Cristina; Villa, Fabio; Cianchi, Alessandro; Mostacci, Andrea; Petrarca, Massimo; Brahlek, Matthew; Koirala, Nikesh; Oh, Seongshik; Lupi, Stefano. - In: NATURE COMMUNICATIONS. - ISSN 2041-1723. - ELETTRONICO. - 7:(2016), p. 11421. [10.1038/ncomms11421]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/870623
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