We study quantum phenomena in optically active low-dimensional condensed matter systems. Conceptually similar to optical spectroscopy of atoms or ions, we use light-matter interaction as an interface between photon and quantum degrees of freedom in solid-state nanoscale systems. The main research lines include experimental quantum optics with quasi zero-dimensional emitters and one-dimensional carbon nanotubes, bottom-up assembly of photofunctional nanosystems by DNA-origami, and novel truly two-dimensional atomic layer semiconductors.
Quantum emitters such as semiconductor quantum dots, nitrogen-vacancy centers in nanodiamond or single-walled carbon nanotubes represent versatile model systems for solid-state quantum optics. Discrete spectra with non-classical photon emission statistics or high degree of spin polarization render individual quasi zero-dimensional systems ideal candidates for the implementation of experimental quantum science by all-optical means.
The interdisciplinary project explores the potential of DNA-assembly for the construction of complex photofunctional nanosystems. It merges recent achievements in biophysics and solid-state nanosciences for DNA-guided fabrication of functional units based on radiant dyes, quantum dots, nanodiamonds and metal nanoparticles. The goal of the project is to establish a tool-box for bottom-up nanometer-precise assembly of photonic systems. Our collaboration partners in the project are the groups of T. Liedl, LMU, A. O. Govorov, Ohio University, Athens, USA, and E. Lifshitz, Technion, Haifa, Israel.
Atomic-layer transition metal dichalcogenides such as MoS2 or WSe2 have emerged recently as novel truly two-dimensional material systems with remarkable optoelectronic properties. Single layer materials combine reduced screening and direct band gap optical transitions. While strong Coulomb interactions enhance phenomena of exciton binding and quantum confinement, strong spin-orbit coupling mediates robust valley coherence that can be mapped onto the photon polarization degrees of freedom. Our collaboration partner in the project is H. Yamaguchi, Los Alamos National Laboratory, Los Alamos, USA.