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Circular dichroism in high-order harmonic generation: Heralding topological phases and transitions in Chern insulators
- Source :
- Physical Review B
- Publication Year :
- 2018
-
Abstract
- Topological materials are of interest to both fundamental science and advanced technologies, because topological states are robust with respect to perturbations and dissipation. Experimental detection of topological invariants is thus in great demand, but it remains extremely challenging. Ultrafast laser-matter interactions, and in particular high-harmonic generation (HHG), meanwhile, were proposed several years ago as tools to explore the structural and dynamical properties of various matter targets. Here we show that the high-harmonic emission signal produced by a circularly-polarized laser contains signatures of the topological phase transition in the paradigmatic Haldane model. In addition to clear shifts of the overall emissivity and harmonic cutoff, the high-harmonic emission shows a unique circular dichroism, which exhibits clear changes in behavior at the topological phase boundary. Our findings pave the way to understand fundamental questions about the ultrafast electron-hole pair dynamics in topological materials via non-linear high-harmonic generation spectroscopy.<br />9 pages including references, then 16 pages of Supplementary Material
- Subjects :
- Physics
Circular dichroism
Quantum Physics
Condensed Matter - Mesoscale and Nanoscale Physics
media_common.quotation_subject
Phase (waves)
Order (ring theory)
FOS: Physical sciences
02 engineering and technology
021001 nanoscience & nanotechnology
Topology
01 natural sciences
Asymmetry
0103 physical sciences
Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
Emissivity
State of matter
High harmonic generation
010306 general physics
0210 nano-technology
Quantum Physics (quant-ph)
Ultrashort pulse
media_common
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Physical Review B
- Accession number :
- edsair.doi.dedup.....a68b667d92d2a9299261414b1dabd099