Terahertz tuning of Dirac plasmons in Bi${}_2$Se${}_3$ Topological Insulator

Abstract

Light can be strongly confined in sub-wavelength spatial regions through the interaction with plasmons, the collective electronic modes appearing in metals and semiconductors. This confinement, which is particularly important in the terahertz spectral region, amplifies light-matter interaction and provides a powerful mechanism for efficiently generating non-linear optical phenomena. These effects are particularly relevant in Dirac materials like graphene and Topological Insulators, where massless fermions show a naturally non-linear optical behavior in the terahertz range. The strong interaction scenario has been considered so far from the point of view of light. In this paper, we investigate instead the effect of strong interaction on the plasmon itself. In particular, we will show that Dirac plasmons in Bi${}_2$Se${}_3$ Topological Insulator are strongly renormalized when excited by high-intensity terahertz radiation by displaying a huge red-shift down to 60% of its characteristic frequency. This opens the road towards tunable terahertz non-linear optical devices based on Topological Insulators.

References in corpus (14)

• Topological Insulators
• Quantum Spin Hall Effect in Graphene
• Observation of Dirac plasmons in a topological insulator
• Thickness-independent transport channels in topological insulator Bi2Se3 thin films
• Epitaxial growth of topological insulator Bi2Se3 film on Si(111) with atomically sharp interface
• Strong nonlinear terahertz response induced by Dirac surface states in Bi2Se3 Topological Insulator
• Efficient Terahertz Harmonic Generation with Coherent Acceleration of Electrons in the Dirac Semimetal Cd3As2
• Terahertz Nonlinearity in Graphene Plasmons
• Universal linear and nonlinear electrodynamics of the Dirac fluid
• Nonperturbative quasi-classical theory of the nonlinear electrodynamic response of graphene
• Infrared Studies of the Onset of Conductivity in Ultra-Thin Pb Films
• Nonlinear Optical Observation of Coherent Acoustic Dirac Plasmons in Thin-Film Topological Insulators
• Third-order optical conductivity of an electron fluid
• Influence of optical nonlinearities on plasma waves in graphene

Cited by in corpus (10)

• Ultrafast dynamics of electrons and phonons: from the two-temperature model to the time-dependent Boltzmann equation
• Surface plasmon-phonon-magnon polariton in a topological insulator-antiferromagnetic bilayer structure
• Strong coupling between a topological insulator and a III-V heterostructure at terahertz frequency
• Plasmons in Two-Dimensional Topological Insulators
• Phonon-mediated strong coupling between a three-dimensional topological insulator and a two-dimensional antiferromagnetic material
• Two-photon IR pumped UV-Vis transient absorption spectroscopy of Dirac fermions in the 2D and 3D topological insulator Bi2Se3
• Real-space nanoimaging of THz polaritons in the topological insulator Bi2Se3
• Dirac plasmon polaritons and magnetic modes in topological-insulator nanoparticles
• Control of 2D plasmons in the topological insulator Bi2Se3 with highly crystalline C60 overlayers
• In-Plane Plasmon Coupling in Topological Insulator Bi${}_2$Se${}_3$ Thin Films