A5006245752- Diamond and Carbon-based Materials Research
- Atomic and Subatomic Physics Research
- High-pressure geophysics and materials
- Advanced NMR Techniques and Applications
- Electronic and Structural Properties of Oxides
- NMR spectroscopy and applications
- Advanced MRI Techniques and Applications
- Semiconductor materials and devices
- Force Microscopy Techniques and Applications
- Advanced Fiber Laser Technologies
- Quantum and electron transport phenomena
- Mechanical and Optical Resonators
- Semiconductor Quantum Structures and Devices
- Solid-state spectroscopy and crystallography
- Boron and Carbon Nanomaterials Research
- Graphene research and applications
- Nonlinear Optical Materials Research
- Quantum optics and atomic interactions
- Photonic and Optical Devices
- Carbon Nanotubes in Composites
- Quantum Dots Synthesis And Properties
- Ion-surface interactions and analysis
- Crystallography and molecular interactions
- Molecular spectroscopy and chirality
- Magnetic properties of thin films
City College of New York
2016-2025
The Graduate Center, CUNY
2016-2025
City University of New York
2005-2024
University of Stuttgart
2018
Center for Integrated Quantum Science and Technology
2018
ACT Government
2017
University of Canberra
2017
Universidad Nacional de Córdoba
1996-2013
Jewish Community Center of Fort Lee
2010
City College
2009
Application of nuclear magnetic resonance (NMR) spectroscopy to nanoscale samples has remained an elusive goal, achieved only with great experimental effort at subkelvin temperatures. We demonstrated detection NMR signals from a (5-nanometer)(3) voxel various fluid and solid organic under ambient conditions. used atomic-size field sensor, single nitrogen-vacancy defect center, embedded ~7 nanometers the surface bulk diamond record spectra placed on surface. Its volume consisted 10(4) spins...
Cooperative phenomena stemming from radiation-field-mediated coupling between individual quantum emitters are presently attracting broad interest for on-chip photonic memories and longrange entanglement.Common to these applications is the generation of electro-magnetic modes over macroscopic distances.Much research, however, still needed before such systems can be deployed in form practical devices, starting with investigation alternate physical platforms.Quantum two-dimensional (2D) provide...
Fluorescent defects recently observed under ambient conditions in hexagonal boron nitride (h-BN) promise to open novel opportunities for the implementation of on-chip photonic devices that rely on identical photons from single emitters. Here we report room-temperature photoluminescence dynamics individual emitters multilayer h-BN flakes exposed blue laser light. Comparison optical spectra recorded at successive times reveals considerable spectral diffusion, possibly result slowly...
Abstract We demonstrate a protocol using individual nitrogen-vacancy centres in diamond to observe the time evolution of proton spins from organic molecules located few nanometres surface. The records temporal correlations among interacting protons, and thus is sensitive local dynamics via its impact on nuclear spin relaxation interaction with nitrogen vacancy. gather information nanoscale rotational translational diffusion by analysing dependence magnetic resonance signal. Applying this...
The negatively charged nitrogen vacancy (NV-) center in diamond is the focus of widespread attention for applications ranging from quantum information processing to nanoscale metrology. Although most work so far has focused on NV- optical and spin properties, control charge state promises complementary opportunities. One intriguing possibility long-term storage information, a notion we hereby introduce using NV-rich, type 1b diamond. As proof principle, use multicolor microscopy read, write,...
The ability to probe nanoscale heat flow in a material is often limited by lack of spatial resolution. Here, we use diamond-nanocrystal-hosted nitrogen-vacancy centre attached the apex silicon thermal tip as local temperature sensor. We apply an electrical current up and rely on NV monitor changes experiences it brought into contact with surfaces varying conductivity. With aid combined AFM/confocal setup, image phantom microstructures resolution, attain excellent agreement between...
Nuclear magnetic resonance (NMR) experiments are typically performed with samples immersed in a magnet shimmed to high homogeneity. However, there many circumstances which it is impractical or undesirable insert objects subjects into the bore of high-field magnet. Here we present methodology based on an adaptation nutation echoes that provides resolved spectra presence matched inhomogeneous static and radiofrequency fields, thereby opening way high-resolution ex situ NMR. The observation...
We report construction of a portable nuclear magnetic resonance sensor with single-sided open probe design. The resulting field inhomogeneity is compensated by pulse sequence that takes advantage parallel in the applied radio frequency field. can thereby acquire fluorine-19 spectra liquid fluorocarbons 8 parts per million resolution, surmounting long-standing obstacle obtaining chemical shift information instruments.
The combination of long spin coherence time and nanoscale size has made nitrogen vacancy (NV) centers in nanodiamonds the subject much interest for quantum information sensing applications. However, currently available high-pressure high-temperature (HPHT) have a high concentration paramagnetic impurities that limit their to order microseconds, less than 1% observed bulk diamond. In this work, we use porous metal mask reactive ion etching process fabricate nanocrystals from high-purity...
Semiconductor nanoparticles host a number of paramagnetic point defects and impurities, many them adjacent to the surface, whose response external stimuli could help probe complex dynamics particle its local, nanoscale environment. Here, we use optically detected magnetic resonance in nitrogen-vacancy (NV) center within an individual diamond nanocrystal investigate composition spin particle-hosted bath. For present sample, ∼45 nm crystal, NV-assisted dark-spin spectroscopy reveals presence...
Dynamic nuclear polarization via contact with electronic spins has emerged as an attractive route to enhance the sensitivity of magnetic resonance (NMR) beyond traditional limits imposed by field strength and temperature. Among various alternative implementations, use nitrogen vacancy (NV) centers in diamond - a paramagnetic point defect whose spin can be optically polarized at room temperature attracted widespread attention, but applications have been hampered need align NV axis external...
In nanoscale metrology applications, measurements are commonly limited by the performance of sensor. Here we show that in nuclear magnetic resonance (NMR) spectroscopy using single nitrogen-vacancy (NV) centers diamond, NV sensor electron spin limits spectral resolution down to a few hundred Hz, which constraints characterization and coherent control finite systems, furthermore, is insufficient for high NMR aiming at molecule recognition structure analysis latter. To overcome limitation,...
Although the spin properties of superficial shallow nitrogen-vacancy (NV) centers have been subject extensive scrutiny, considerably less attention has devoted to studying dynamics NV charge conversion near diamond surface. Using multicolor confocal microscopy, here we show that near-surface point defects arising from high-density ion implantation dramatically increase ionization and recombination rates NVs compared those in bulk diamond. Further, find these grow linearly, not quadratically,...
We show how high-resolution NMR spectra can be obtained for solids which the are normally broadened due to structural disorder. The method relies on correlations in chemical shifts between pairs of coupled spins. It is found experimentally that there strong neighboring spins both phosphorus-31 and carbon-13 spectra. These exploited not only provide resolution two-dimensional spectra, but also yield "chains" correlated shifts, constituting a valuable new source information disordered materials.
Optical pumping of spin polarization can produce almost complete order but its application is restricted to select atomic gases and condensed matter systems. Here, we theoretically investigate a novel route nuclear hyperpolarization in arbitrary fluids which target molecules are exposed polarized paramagnetic centers located near the surface host material. We find that adsorbed spins relax positive or negative depending on average center depth nanoscale topology. For particular case...
Abstract The nitrogen-vacancy (NV) centre in diamond is emerging as a promising platform for solid-state quantum information processing and nanoscale metrology. Of interest these applications the manipulation of NV charge, which can be attained by optical excitation. Here, we use two-colour microscopy to investigate dynamics photo-ionization, charge diffusion trapping type-1b diamond. We combine fixed-point laser excitation scanning fluorescence imaging locally alter concentration negatively...
Point defects in wide-band-gap semiconductors are emerging as versatile resources for nanoscale sensing and quantum information science, but our understanding of the photoionization dynamics is presently incomplete. Here, we use two-color confocal microscopy to investigate charge type 1b diamond hosting nitrogen-vacancy (NV) silicon-vacancy (SiV) centers. By examining nonlocal fluorescence patterns from local laser excitation, show that, simultaneous presence photogenerated electrons holes,...
Significance Dynamic nuclear polarization (DNP) can lead to rapidly accelerated NMR spectroscopy and MRI imaging via significant magnetic resonance signal gains. We develop a technique of microwave frequency comb DNP that is especially suited broad-spectrum electron radicals widely used for in variety contexts. The allows one overcome the bottleneck set by slow sweeps, increasing effective number transfer events resulting multiplicative gain enhancement. demonstrate enhancement from 30 100...
Abstract Integration of quantum emitters in photonic structures is an important step the broader quest to generate and manipulate on-demand single photons via compact solid-state devices. Unfortunately, implementations relying on material platforms that also serve as emitter host often suffer from a tradeoff between desired properties system practicality performance. Here, we demonstrate “pick place” integration Si 3 N 4 microdisk optical resonator with bright form ∼20-nm-thick hexagonal...
One of the most remarkable properties nitrogen-vacancy (NV) center in diamond is that optical illumination initializes its electronic spin almost completely, a feature can be exploited to polarize other species their proximity. Here we use field-cycled nuclear magnetic resonance (NMR) investigate mechanisms polarization transfer from NVs 13C spins at room temperature. We focus on dynamics near 51 mT, where fortuitous combination energy matching conditions between electron and levels gives...
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...
Coherent communication over mesoscale distances is a necessary condition for the application of solid-state spin qubits to scalable quantum information processing. Among other routes under study, one possibility entails generation magnetostatic surface waves (MSSW) dipolarly coupled shallow paramagnetic defects in wide-bandgap semiconductors. As an initial step this direction, here we make use room-temperature MSSWs mediate interaction between microwave field from antenna and...