A5085452491- Diamond and Carbon-based Materials Research
- Electronic and Structural Properties of Oxides
- High-pressure geophysics and materials
- Atomic and Subatomic Physics Research
- Force Microscopy Techniques and Applications
- Magnetic Field Sensors Techniques
- Characterization and Applications of Magnetic Nanoparticles
- Quantum and electron transport phenomena
- Semiconductor materials and devices
- Graphene research and applications
- Topological Materials and Phenomena
- Galectins and Cancer Biology
- Advanced MRI Techniques and Applications
- Metal and Thin Film Mechanics
- Monoclonal and Polyclonal Antibodies Research
- Glycosylation and Glycoproteins Research
- Magnetic Properties and Applications
- Corporate Governance and Management
- Cold Atom Physics and Bose-Einstein Condensates
- Digital Innovation in Industries
ETH Zurich
1998-2023
Nanoscale electronic transport gives rise to a number of intriguing physical phenomena that are accompanied by distinct spatial patterns current flow. Here, we report on sensitive magnetic imaging two-dimensional distributions in bilayer graphene at room temperature. By combining dynamical modulation the source-drain with ac quantum sensing nitrogen-vacancy center diamond probe, acquire field and density maps excellent sensitivities 4.6 nT 20 nA/$\mu$m, respectively. The resolution is 50-100...
We report on the implementation of a scanning nitrogen-vacancy (NV) magnetometer in dry dilution refrigerator. Using pulsed optically detected magnetic resonance combined with efficient microwave delivery through co-planar waveguide, we reach base temperature 350 mK, limited by experimental heat load and thermalization probe. demonstrate NV magnetometry imaging superconducting vortices 50-nm-thin aluminum microstructure. The sensitivity our measurements is approximately 3 μT per square root...
The nitrogen vacancy (NV) center in diamond is well known for its outstanding optical and spin properties, enabling various applications quantum sensing information at both cryogenic ambient temperatures. Despite a large body of work, however, the NV center's dynamics intermediate temperatures are incompletely understood. This paper describes basic rate model able to explain population over full parameter space temperature, crystallographic strain, magnetic field. Numerical simulations...
Two photoluminescence experiments and models of nitrogen-vacancy centers in diamond over broad temperature ranges improve our understanding the photodynamics vacancy other spin defects.
We introduce a double quantum (DQ) 4-Ramsey measurement protocol that enables wide-field magnetic imaging using nitrogen vacancy (NV) centers in diamond, with enhanced homogeneity of the sensitivity relative to conventional single (SQ) techniques. The DQ employs microwave-phase alternation across four consecutive Ramsey (4-Ramsey) measurements isolate desired signal from any residual SQ induced by microwave pulse errors. In demonstration experiment employing 1-$μ$m-thick NV layer macroscopic...
Tunneling between two close-by edge states is a potentially powerful probe of topological order in the fractional quantum Hall effect. A fit to experimental data believed yield effective charge and interaction parameter current-carrying quasiparticles. However, robustness this method has yet be established. Here, authors consider well-understood state at $\ensuremath{\nu}=1/3$ check whether quasiparticle tunneling measures expected parameters. While $e/3$ observed, not universal, currently...
We report on measurements of the photoluminescence properties single nitrogen-vacancy centers in diamond at temperatures between 4 K and 300 K. observe a strong reduction PL intensity spin contrast ca. 10 100 that recovers to high levels below above. Further, we find rich dependence magnetic bias field crystal strain. develop comprehensive model based mixing orbital hopping electronic excited state quantitatively explains observations. Beyond more complete understanding excited-state...
The nitrogen-vacancy (NV) center in diamond is well known quantum metrology and information for its favorable spin optical properties, which span a wide temperature range from near zero to over 600 K. Despite prominence, the NV center's photo-physics incompletely understood, especially at intermediate temperatures between 10-100 K where phonons become activated. In this work, we present rate model able describe cross-over low-temperature high-temperature regime. Key phonon-driven hopping two...
Novel glycoproteins, inaccessible by other techniques, can be obtained metabolic engineering of the oligosaccharide biosynthesis pathway. Furthermore, alteration cell-surface oligosaccharides change properties receptors involved in cell–cell adhesion. Sialyl Lewis X (sLex) is a determinant which specifically expressed on granulocytes and monocytes interacts with selectins to influence leukocyte trafficking, thrombosis, inflammation, cancer. Antisense technology targeting fucosyltransferase...