A5077914180- Diamond and Carbon-based Materials Research
- Force Microscopy Techniques and Applications
- Quantum optics and atomic interactions
- Advanced Fiber Laser Technologies
- Metal and Thin Film Mechanics
- Mechanical and Optical Resonators
- Advanced Surface Polishing Techniques
- Atomic and Subatomic Physics Research
- High-pressure geophysics and materials
- Engineering and Materials Science Studies
- Advanced Materials Characterization Techniques
- Ubiquitin and proteasome pathways
- Embedded Systems and FPGA Design
- Spacecraft Dynamics and Control
- Radiation Therapy and Dosimetry
- Atomic and Molecular Physics
- Real-time simulation and control systems
- Laser-Ablation Synthesis of Nanoparticles
- Advanced Combustion Engine Technologies
- Electric and Hybrid Vehicle Technologies
- Semiconductor materials and devices
- Endoplasmic Reticulum Stress and Disease
- Carbon Nanotubes in Composites
- Engine and Fuel Emissions
- Electronic and Structural Properties of Oxides
Saarland University
2019-2024
Deggendorf Institute of Technology
2022-2023
Liebherr (Germany)
2018-2023
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2014
University of Coimbra
2010
Munich University of Applied Sciences
1970
The recently discovered negatively charged tin-vacancy centre in diamond is a promising candidate for applications quantum information processing (QIP). We here present detailed spectroscopic study encompassing single photon emission and polarisation properties, the temperature dependence of spectra as well analysis phonon sideband Debye-Waller factor. Using photoluminescence excitation spectroscopy (PLE) we probe an energetically higher lying excited state prove fully lifetime limited...
Quantum information processing (QIP) with solid state spin qubits strongly depends on the efficient initialisation of qubit's desired charge state. While negatively charged tin-vacancy ($\text{SnV}^{-}$) centre in diamond has emerged as an excellent platform for realising QIP protocols due to long coherence times at liquid helium temperature and lifetime limited optical transitions, its usefulness is severely by termination fluorescence under resonant excitation [1,2,3]. Here, we unveil...
We investigate native nitrogen vacancy (NV) and silicon (SiV) color centers in a commercially available, heteroepitaxial, wafer-sized, mm thick, single-crystal diamond. observe single, NV with density of roughly 1 per μm3 moderate coherence time (T2 = 5 μs) embedded an ensemble SiV centers. Using low temperature luminescence as probe, we prove the high crystalline quality diamond especially close to growth surface, consistent reduced dislocation density. ion implantation plasma etching,...
Abstract The silicon‐vacancy center in diamond holds great promise as a qubit for quantum communication networks. However, since the optical transitions are located within visible red spectral region, frequency conversion to low‐loss telecommunication wavelengths becomes necessity its use long‐range, fiber‐linked This work presents highly efficient, low‐noise device photons emitted by (SiV) telecom C‐band. By using two‐stage difference‐frequency mixing scheme, spontaneous parametric...
Point defects in diamond, promising candidates for nanoscale pressure- and temperature-sensing applications, are potentially scalable polycrystalline diamond fabricated using the microwave plasma-enhanced chemical vapor deposition (MW PE CVD) technique. However, this approach introduces residual stress films, leading to variations characteristic zero phonon line (ZPL) of point defect diamond. Here, we report effect on germanium-vacancy (GeV) centers MW CVD nanocrystalline (NCD) films single...
Glutamic acid decarboxylase is responsible for synthesizing GABA, the major inhibitory neurotransmitter, and exists in two isoforms—GAD65 GAD67. The enzyme cleaved under excitotoxic conditions, but mechanisms involved functional consequences are not fully elucidated. We found that stimulation of cultured hippocampal neurons with glutamate leads to a time-dependent cleavage GAD65 GAD67 N-terminal region proteins, decrease corresponding mRNAs. was sensitive proteasome inhibitors MG132, YU102...
We report the in-situ formation of germanium vacancy (GeV) centres in nanocrystalline diamond (NCD) using chemical vapor deposition (CVD) technique. Commercial Ge wafers are used as solid dopant source and substrate. The hydrogen-rich plasma (1% CH4 H2, 3000 W 45 Torr, ASTeX 6500 series system) etches substrate introduces GeV complex NCD layer. As melting proximity CVD growth temperature limitations; depositions restricted to (720 ± 20)°C. Scanning electron microscopy reveal randomly...
Silicon carbide (SiC) is the leading wide-bandgap semiconductor material, providing mature doping and device fabrication. Additionally, SiC hosts a multitude of optically active point defects (color centers), it an excellent material for optical resonators due to its high refractive index outstanding mechanical Q/f product. Moreover, epitaxial graphene layers can be grown as ultrathin electrodes provide potential fine-tune color center resonances. These characteristics render ideal platform...
The silicon-vacancy center in diamond holds great promise as a qubit for quantum communication networks. However, since the optical transitions are located within visible red spectral region, frequency conversion to low-loss telecommunication wavelengths becomes necessity its use long-range, fiber-linked This work presents highly efficient, low-noise device photons emitted by (SiV) telecom C-band. By using two-stage difference-frequency mixing scheme SPDC noise is circumvented and Raman...
We present highly efficient quantum frequency down-conversion of photons resonant to silicon-vacancy centers in diamond. By using a two-stage conversion scheme we achieve very low noise photon rate 7.2(5) cps.
We investigate native nitrogen (NV) and silicon vacancy (SiV) color centers in commercially available, heteroepitaxial, wafer-sized, mm thick, single-crystal diamond. observe single, NV with a density of roughly 1 per $μm^3$ moderate coherence time ($T_2 = 5 μs$) embedded an ensemble SiV centers. Low-temperature spectroscopy the zero phonon line fine structure witnesses high crystalline quality diamond especially close to growth surface, consistent reduced dislocation density. Using ion...
Color centers in diamond, specifically the group-IV-vacancy centers, have emerged as promising candidates among solid state qubits. Among these, tin-vacancy (SnV) center features optimum combination of long spin coherence time and favorable optical properties. We here investigate generation indistinguishable single photons from SnV explore influence residual spectral diffusion. To improve photon collection efficiency we fabricate a planar antenna based on two silver mirrors coated thin...
Zunehmende energetische Anforderungen bei der Betriebsführung von Wärmeverteilsystemen erfordern im Kontext Wärmewende geringinvestive Ansätze zur Anlagenoptimierung. Im Forschungsvorhaben „AutoBop“ werden daher Betriebsoptimierungsverfahren untersucht und entwickelt, die nach dem Add-on-Prinzip in bestehende Heizungssysteme integriert können binnen kürzester Zeit für einen effizienteren Betrieb sorgen.