Artificially constructed plasmaron and plasmon-exciton molecule in 2D-metals

TL;DR

This paper reports the creation and observation of exotic three- and four-particle states, plasmarons and plasmon-exciton molecules, in a 2D electron system under magnetic field, revealing new spectral features.

Contribution

It introduces engineered plasmarons and plasmon-exciton molecules in 2D metals, demonstrating their spectral signatures and long-lived non-equilibrium states.

Findings

Observation of plasmarons and plasmon-exciton molecules in 2D systems.

Identification of these states as new features in recombination spectra.

Long-lived non-equilibrium excitonic states in 2D electron systems.

Abstract

Resonant optical excitation was used to create a macroscopic non-equilibrium ensemble of dark excitons with unprecedentedly long lifetime in a two-dimensional (2D) electron system placed in a quantizing magnetic field. Exotic three-particle and four-particle states, plasmarons and plasmon-exciton molecules, coupled with the surrounding electrons through the collective plasma oscillations are engineered. Plasmarons and plasmon-exciton molecules are manifested as new features in the recombination spectra of non-equilibrium systems. Magnetoplasmarons and magnetotrions in a two-dimensional Hall insulator.