Strong nonlinear terahertz response induced by Dirac surface states in Bi2Se3 topological insulator

Flavio Giorgianni; Enrica Chiadroni; Andrea Rovere; Mariangela Cestelli-Guidi; Andrea Perucchi; Marco Bellaveglia; Michele Castellano; Domenico Di Giovenale; Giampiero Di Pirro; Massimo Ferrario; Riccardo Pompili; Cristina Vaccarezza; Fabio Villa; Alessandro Cianchi; Andrea Mostacci; Massimo Petrarca; Matthew Brahlek; Nikesh Koirala; Seongshik Oh; Stefano Lupi

doi:10.1038/ncomms11421

journal article Open Access Apr 26, 2016

Strong nonlinear terahertz response induced by Dirac surface states in Bi2Se3 topological insulator

Flavio Giorgianni Enrica Chiadroni Andrea Rovere Mariangela Cestelli-Guidi Andrea Perucchi Marco Bellaveglia Michele Castellano Domenico Di Giovenale Giampiero Di Pirro Massimo Ferrario Riccardo Pompili Cristina Vaccarezza Fabio Villa Alessandro Cianchi Andrea Mostacci Massimo Petrarca Matthew Brahlek Nikesh Koirala Seongshik Oh Stefano Lupi

Nature Communications Vol. 7 No. 1 · Springer Science and Business Media LLC

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Abstract

AbstractElectrons 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.

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Published: Apr 26, 2016
Vol/Issue: 7(1)
License: View

Authors

Mariangela Cestelli-Guidi

Domenico Di Giovenale

Cite This Article

Flavio Giorgianni, Enrica Chiadroni, Andrea Rovere, et al. (2016). Strong nonlinear terahertz response induced by Dirac surface states in Bi2Se3 topological insulator. Nature Communications, 7(1). https://doi.org/10.1038/ncomms11421

Strong nonlinear terahertz response induced by Dirac surface states in Bi2Se3 topological insulator

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