Circular dichroism in higher-order harmonic generation: Heralding topological phases and transitions in Chern insulators

TY - JOUR

T1 - Circular dichroism in higher-order harmonic generation

T2 - Heralding topological phases and transitions in Chern insulators

AU - Chacón, Alexis

AU - Kim, Dasol

AU - Zhu, Wei

AU - Kelly, Shane P.

AU - Dauphin, Alexandre

AU - Pisanty, Emilio

AU - Maxwell, Andrew S.

AU - Picón, Antonio

AU - Ciappina, Marcelo F.

AU - Kim, Dong Eon

AU - Ticknor, Christopher

AU - Saxena, Avadh

AU - Lewenstein, MacIej

N1 - Publisher Copyright: © 2020 American Physical Society.

PY - 2020/10/21

Y1 - 2020/10/21

N2 - 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 remains extremely challenging. Ultrafast laser-matter interactions, and in particular high-harmonic generation, 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 topological phases and transitions 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 nonlinear high-harmonic generation spectroscopy.

AB - 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 remains extremely challenging. Ultrafast laser-matter interactions, and in particular high-harmonic generation, 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 topological phases and transitions 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 nonlinear high-harmonic generation spectroscopy.

UR - http://www.scopus.com/inward/record.url?scp=85095117941&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.102.134115

DO - 10.1103/PhysRevB.102.134115

M3 - 文章

AN - SCOPUS:85095117941

SN - 2469-9950

VL - 102

JO - Physical Review B

JF - Physical Review B

IS - 13

M1 - 134115

ER -