Strong-field physics in three-dimensional topological insulators
- URL: http://arxiv.org/abs/2008.01265v1
- Date: Tue, 4 Aug 2020 01:24:00 GMT
- Title: Strong-field physics in three-dimensional topological insulators
- Authors: Denitsa Baykusheva, Alexis Chac\'on, Dasol Kim, Dong Eon Kim, David A.
Reis, Shambhu Ghimire
- Abstract summary: We focus on the process of non-perturbative high-order harmonic generation from the paradigmatic three-dimensional topological insulator bisselenide.
We analyze the contributions from the spin-orbit-coupled bulk states and the topological surface bands separately and reveal a major difference in how their harmonic yields depend on the ellipticity of the laser field.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We investigate theoretically the strong-field regime of light-matter
interactions in the topological-insulator class of quantum materials. In
particular, we focus on the process of non-perturbative high-order harmonic
generation from the paradigmatic three-dimensional topological insulator
bismuth selenide (Bi$_2$Se$_3$) subjected to intense mid-infrared laser fields.
We analyze the contributions from the spin-orbit-coupled bulk states and the
topological surface bands separately and reveal a major difference in how their
harmonic yields depend on the ellipticity of the laser field. Bulk harmonics
show a monotonous decrease in their yield as the ellipticity increases, in a
manner reminiscent of high harmonic generation in gaseous media. However, the
surface contribution exhibits a highly non-trivial dependence, culminating with
a maximum for circularly polarized fields. We attribute the observed anomalous
behaviour to: (i) the enhanced amplitude and the circular pattern of the
interband dipole and the Berry connections in the vicinity of the Dirac point;
and (ii) the influence of the higher-order, "hexagonal warping" terms in the
Hamiltonian, which are responsible for the hexagonal deformation of the energy
surface at higher momenta. The latter are associated directly with
spin-orbit-coupling parameters. Our results thus establish the sensitivity of
strong-field driven high harmonic emission to the topology of the band
structure as well as to the manifestations of spin-orbit interaction.
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