A5053715813- Semiconductor Quantum Structures and Devices
- Semiconductor Lasers and Optical Devices
- Photonic and Optical Devices
- 2D Materials and Applications
- Quantum Dots Synthesis And Properties
- Advanced Semiconductor Detectors and Materials
- Strong Light-Matter Interactions
- Quantum and electron transport phenomena
- Graphene research and applications
- Historical, Literary, and Cultural Studies
- Advanced Combustion Engine Technologies
- Plasmonic and Surface Plasmon Research
- Combustion and flame dynamics
- Molecular Junctions and Nanostructures
- Quantum Information and Cryptography
- Vehicle emissions and performance
- Mechanical and Optical Resonators
University of Würzburg
2020-2023
BMW (Germany)
2016
BMW Group (Germany)
2016
Two-photon interference from an InAs/InAlGaAs quantum dot (QD) emitting in the telecom C-band with a raw two-photon visibility of $V_{HOM}=(71.9\pm0.2)$ % is demonstrated. This achieved by two-fold approach: improvement molecular beam epitaxial growth for better QDs, and integration QDs into optical circular Bragg grating resonator Purcell enhancement radiative decay rate. The properties fabricated device are studied means time-correlated single-photon counting under quasi-resonant...
Abstract Purcell‐enhanced quantum dot single‐photon emission in the telecom C‐band from InAs dots inside circular Bragg grating cavities is shown. The are grown by means of molecular beam epitaxy on an InP substrate and embedded into a quaternary In 0.53 Al 0.23 Ga 0.24 As membrane structure. post‐growth flip‐chip process with subsequent removal electron beam‐lithography, (“bullseye”) resonators defined. Micro‐photoluminescence studies devices at cryogenic temperatures K reveal individual...
We revisit and extend the standard bosonic interpretation of interlayer excitons in moir\'e potential twisted heterostructures transition-metal dichalcogenides. In our experiments, we probe a high quality MoSe$_2$/WSe$_2$ van der Waals bilayer heterostructure via density-dependent photoluminescence spectroscopy reveal strongly developed, unconventional spectral shifts emergent exciton resonances. The observation saturating blueshifts successive resonances allow us to explain their physics...
In recent years, novel two-dimensional materials such as graphene, bismuthene, and transition-metal dichalcogenides have attracted considerable interest due to their unique physical properties. However, certain lattice geometries, the Lieb lattice, do not exist atomic monolayers. Fortunately, a range of effects can be transferred realms photonics by creating artificial photonic lattices emulating these materials. Here, exciton-polaritons in semiconductor microcavities offer an exciting...
The investigation of excitons in van-der-Waals heterostructures has led to profound insights into the interplay crystal symmetries and fundamental effects light-matter coupling. In particular, polarization selection rules undistorted, slightly twisted MoSe$_2$/WSe$_2$ were found be connected with Moir\'e superlattice. Here, we report emergence a significant degree circular such hetero-structure upon non-resonant driving linearly polarized laser. effect is present at zero magnetic field,...
Abstract Generating single photons in the telecommunication wavelength range from semiconductor quantum dots (QDs) and interfacing them with spins of electrons or holes is high interest recent years, research mainly focusing on indium‐based QDs. However, there not much data optical spin properties gallium antimonide (GaSb) QDs, despite it being a physically rich system an indirect to direct bandgap crossover telecom range. This work investigates (quantum‐) GaSb which are fabricated by...
We revisit and extend the standard bosonic interpretation of interlayer excitons in moiré potential twisted heterostructures transition-metal dichalcogenides. In our experiments, we probe a high quality MoSe$_2$/WSe$_2$ van der Waals bilayer heterostructure via density-dependent photoluminescence spectroscopy reveal strongly developed, unconventional spectral shifts emergent exciton resonances. The observation saturating blueshifts successive resonances allow us to explain their physics...
Creating single photons in the telecommunication wavelength range from semiconductor quantum dots (QDs) and interfacing them with spins of electrons or holes has been high interest recent years, research mainly focusing on indium based QDs. However, there is not much data optical spin properties galliumantimonide (GaSb) QDs, despite it being a physically rich system an indirect to direct bandgap crossover telecom range. Here, we investigate (quantum-) GaSb dots, which are fabricated by...