title: Circular-polarization-sensitive metamaterial based on triple-quantum-dot molecules.
abstract: We propose a new type of chiral metamaterial based on an ensemble of artificial molecules formed by three identical quantum dots in a triangular arrangement. A static magnetic field oriented perpendicular to the plane breaks mirror symmetry, rendering the molecules sensitive to the circular polarization of light. By varying the orientation and magnitude of the magnetic field one can control the polarization and frequency of the emission spectrum. We identify a threshold frequency Ω, above which we find strong birefringence. In addition, Kerr rotation and circular-polarized lasing action can be implemented. We investigate the single-molecule lasing properties for different energy-level arrangements and demonstrate the possibility of circular-polarization conversion. Finally, we analyze the effect of weak stray electric fields or deviations from the equilateral triangular geometry.
authors.affiliation: Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany and DFG Center for Functional Nanostructures (CFN), Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany.
authors.forename: Panagiotis
authors.initials: P
authors.lastname: Kotetes
authors.affiliation: Institute of Logistics Engineering, Shanghai Maritime University, Shanghai 201306, China.
authors.forename: Pei-Qing
authors.initials: PQ
authors.lastname: Jin
authors.affiliation: Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Marthaler
authors.affiliation: Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany and DFG Center for Functional Nanostructures (CFN), Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany.
authors.forename: Gerd
authors.initials: G
authors.lastname: Schön