A5103160757- Diamond and Carbon-based Materials Research
- High-pressure geophysics and materials
- Force Microscopy Techniques and Applications
- Semiconductor materials and devices
- Atomic and Subatomic Physics Research
- Electronic and Structural Properties of Oxides
- Advanced Fiber Laser Technologies
- Metal and Thin Film Mechanics
- Near-Field Optical Microscopy
- Quantum Information and Cryptography
- GaN-based semiconductor devices and materials
- Quantum and electron transport phenomena
- Integrated Circuits and Semiconductor Failure Analysis
- Mechanical and Optical Resonators
- Graphene research and applications
- Photonic and Optical Devices
- Carbon Nanotubes in Composites
- Semiconductor Quantum Structures and Devices
- Ion-surface interactions and analysis
- Nonlinear Optical Materials Studies
- Advancements in Semiconductor Devices and Circuit Design
- Analytical Chemistry and Sensors
- Advanced Fluorescence Microscopy Techniques
- Laser-Matter Interactions and Applications
- Electrocatalysts for Energy Conversion
University of Stuttgart
2016-2025
Center for Integrated Quantum Science and Technology
2016-2024
Max Planck Institute for Solid State Research
2016-2024
Weizmann Institute of Science
2023
Stuttgart Observatory
2017-2018
Universität Ulm
2002-2016
Belarusian State University
1996-1998
University of Hagen
1996-1998
NMR on diamonds gets down to chemistry Nuclear magnetic resonance (NMR) spectroscopy is immensely useful for chemical characterization, but it requires relatively large amounts of sample. Recent studies have leveraged nitrogen vacancy centers in diamond detect signals from samples just a few cubic nanometers, with low resolution. Aslam et al. optimized this technique achieve resolution 1 part per million—sufficient distinguish among alkyl, vinyl, and aryl protons solution (see the...
Newly discovered van der Waals materials like MoS2, WSe2, hexagonal boron nitride (h-BN), and recently C2N have sparked intensive research to unveil the quantum behavior associated with their 2D structure. Of great interest are that host single emitters. h-BN, a band gap of 5.95 eV, has been shown emitters which stable at room temperature in UV visible spectral range. In this paper we investigate correlations between h-BN structural features emitter location from bulk down monolayer...
Photonic structures in diamond are key to most of its application quantum technology. Here, we demonstrate tapered nano-waveguides structured directly onto the substrate hosting shallow-implanted nitrogen vacancy (NV) centers. By optimization based on simulations and precise experimental control geometry these pillar-shaped nano-waveguides, achieve a net photon flux up ~ $1.7 \cdot 10^6 /s$. This presents brightest monolithic bulk structure single NV centers so far. We observe no impact...
Abstract Atomic-size spin defects in solids are unique quantum systems. Most applications require nanometre positioning accuracy, which is typically achieved by low-energy ion implantation. A drawback of this technique the significant residual lattice damage, degrades performance spins applications. Here we show that charge state implantation-induced drastically influences formation during thermal annealing. Charging vacancies at, for example, nitrogen implantation sites suppresses vacancy...
Electron spins in solids constitute remarkable quantum sensors. Individual defect centers diamond were used to detect individual nuclear with a nanometer scale resolution, and ensemble magnetometers rival SQUID vapor cell when taking into account room-temperature operation size. NV center can also electric field vectors, despite their weak coupling fields. Here, we employ ensembles of measure macroscopic AC fields high precision. We utilize low strain, 12C enriched achieve the maximum...
Three-dimensional semiconductor chip architectures promise high-density memory and much faster computation, but self-heating leakage currents still severely limit performance. While current-density mapping is crucial to studying these issues in situ, nondestructive imaging has been limited two dimensions. The authors use ensembles of nitrogen-vacancy centers diamond as nanoscale quantum sensors probe all three vectorial components magnetic fields associated with electric currents, for...
The constant interplay and information exchange between cells the microenvironment are essential to their survival ability execute biological functions. To date, a few leading technologies such as traction force microscopy, optical/magnetic tweezers, molecular tension–based fluorescence microscopy broadly used in measuring cellular forces. However, considerable limitations, regarding sensitivity ambiguities data interpretation, hindering our thorough understanding of mechanobiology. Here, we...
In recent years, solid-state spin systems have emerged as promising candidates for quantum information processing (QIP). Prominent examples are the Nitrogen-Vacancy (NV) center in diamond, phosphorous dopants silicon (Si:P), rare-earth ions solids and V$_{\text{Si}}$-centers Silicon-carbide (SiC). The Si:P system has demonstrated, that by eliminating electron of dopant, its nuclear spins can yield exceedingly long coherence times. For NV centers, however, a proper charge state storage qubit...
Near-surface nitrogen-vacancy ({NV}) centers in diamond have been successfully employed as atomic-sized magnetic field sensors for external spins over the last years. A key challenge is still to develop a method bring NV at nanometer proximity surface while preserving their optical and spin properties. To that aim we present of controlled etching with nanometric precision using an oxygen inductively coupled plasma (ICP) process. Importantly, no traces plasma-induced damages etched could be...
Controlled enhancement of NV center fluorescence in nanodiamonds <italic>via</italic> control over the formation process and surface parameters.
The ability to optically initialize the electronic spin of nitrogen-vacancy (NV) center in diamond has long been considered a valuable resource enhance polarization neighboring nuclei, but efficient transfer species outside crystal proven challenging. Here we demonstrate variable-magnetic-field, microwave-enabled cross-polarization from NV protons model viscous fluid contact with surface. Slight changes cross-relaxation rate as function wait time between successive repetitions protocol...
Abstract Nitrogen-vacancy (NV) centers in diamond are promising quantum sensors because of their long spin coherence time under ambient conditions. However, resonances relatively insensitive to non-magnetic parameters such as temperature. A magnetic-nanoparticle-nanodiamond hybrid thermometer, where the temperature change is converted magnetic field variation near Curie temperature, were demonstrated have enhanced sensitivity ($11{\rm{\,\,mK\,\,H}}{{\rm{z}}^{ - 1/2}}$) (Wang N, Liu G-Q and...
The ability to perform nanoscale electric field imaging of elementary charges at ambient temperatures will have diverse interdisciplinary applications. While the nitrogen-vacancy (NV) center in diamond is capable high-sensitivity electrometry, demonstrations so far been limited macroscopic features or detection single internal itself. In this work we greatly extend these capabilities by using a shallow NV image charged atomic force microscope tip with resolution. This achieved measuring...
Gold nanoparticles were prepared by electrochemical deposition on highly oriented pyrolytic graphite (HOPG) and boron-doped, epitaxial 100-oriented diamond layers. Using a potentiostatic double pulse technique, the average particle size was varied in range from 5 nm to 30 case of HOPG as support between < 1 15 surfaces, while keeping density constant. The distribution sizes very narrow, with standard deviations around 20% 30% diamond. electrocatalytic activity towards hydrogen evolution...
Nitrogen-vacancy (NV) centers in diamond can be used as quantum sensors to image the magnetic field with nanoscale resolution. However, electric-field mapping has not been achieved so far because of relatively weak coupling strength between NV and electric field. Here, using individual shallow NVs, we quantitatively contours from a sharp tip qPlus-based atomic force microscope (AFM), achieve spatial resolution ~10 nm. Through such local fields, demonstrated control NV's charge state sub-5 nm...
Shallow nitrogen-vacancy (NV) centers in diamond are promising for nanomagnetometry, they can be placed proximate to targets. To study the intrinsic magnetic properties, zero-field magnetometry is desirable. However, shallow NV under zero field, strain near surfaces would cause level anticrossing between spin states, leading clock transitions whose frequencies insensitive signals. Furthermore, charge noises from induce extra decoherence and hence reduce sensitivity. Here, we demonstrate that...
Near-surface negatively charged nitrogen vacancy (NV) centers hold excellent promise for nanoscale magnetic imaging and quantum sensing. However, they often experience charge-state instabilities, leading to strongly reduced fluorescence NV coherence time, which impact sensitivity. This occurs even more severely at 4 K ultrahigh vacuum (UHV, p = 2 × 10-10 mbar). We demonstrate that in situ adsorption of H2O on the diamond surface allows partial recovery shallow sensors. Combining these with...
Quantum sensors offer exceptional sensitivity to nanoscale magnetic field fluctuations, where non-stationary effects such as spin diffusion and non-Markovian dynamics arising from coupling few environmental degrees of freedom play critical roles. Here, we demonstrate how quantum can characterize the statistical properties noise sources, distinguishing between stationary behaviors, well Markovian dynamics. Using nitrogen-vacancy (NV) centers in diamond a platform, develop physical model that...
Abstract Critical parameters are the key to superconductivity research, and reliable instrumentations can facilitate study. Traditionally, one has use several different measurement techniques measure critical separately. In this work, we develop of a single species quantum sensor determine estimate with help independent simulation data. We utilize nitrogen-vacancy (NV) center in diamond, which recently emerged as promising candidate for probing exotic features condensed matter physics. The...