Topological edge-state contributions to high-order harmonic generation in finite flakes
arXiv:2205.12810 · doi:10.1103/PhysRevB.106.054303
Abstract
Edge states play a major role in the electron dynamics of topological insulators as they are the only conducting part in such materials. In this work, we consider the Haldane model for a 2D topological insulator, subjected to an intense laser field. We compare the numerically simulated high-harmonic generation (HHG) in the bulk of the Haldane model to HHG in corresponding finite flakes with edge states present, and explain the differences. In particular, peaks for energies below the bulk band gap appear in the spectra for the finite flakes. The positions of these peaks show a strong dependence on the size of the flakes, which can be explained using the dispersion relation for the edge states.
9 pages, 7 figures
References in corpus (10)
- Edge states in Graphene: from gapped flat band to gapless chiral modes
- Impact of the electronic band structure in high-harmonic generation spectra of solids
- Introduction to theory of high-harmonic generation in solids: tutorial
- All-optical probe of three-dimensional topological insulators based on high-harmonic generation by circularly-polarized laser fields
- Strong-field physics in three-dimensional topological insulators
- Topological edge states and quantum Hall effect in the Haldane model
- Expanded view of electron-hole recollisions in solid-state high-order harmonic generation: Full-Brillouin-zone tunneling and imperfect recollisions
- Intense-laser driven electron dynamics and high-harmonic generation in solids including topological effects
- High-order harmonic generation in hexagonal nanoribbons
- Edge-state influence on high-order harmonic generation in topological nanoribbons