Work

Resonant laser excitation and time-domain imaging of chiral topological polariton edge states

Year: 2020

Type: article

Abstract: We investigate the dynamics of chiral edge states in topological polariton systems under laser driving.Using a model system comprised of topolgically trivial excitons and photons with a chiral coupling proposed by Karzig et al. [Phys. Rev. X 5, 031001 (2015)], we investigate the real-time dynamics of a lattice version of this model driven by a laser pulse.By analyzing the time-and momentum-resolved spectral function, measured by timeand angle-resolved photoluminescence in analogy with time-and angle-resolved photoemission spectroscopy in electronic systems, we find that polaritonic states in a ribbon geometry are selectively excited via their resonance with the pump laser photon frequency.This selective excitation mechanism is independent of the necessity of strong laser pumping and polariton condensation.Our work highlights the potential of time-resolved spectroscopy as a complementary tool to real-space imaging for the investigation of topological edge state engineering in devices.

Source: Physical Review Research

DOI: 10.1103/physrevresearch.2.033386

Authors: Damian Hofmann, Michael A. Sentef

Institutions: Max Planck Institute for the Structure and Dynamics of Matter, University of Bremen

Language: English

Topic: Topological Materials and Phenomena

Subfield: Condensed Matter Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,625

Funder: Deutsche Forschungsgemeinschaft