Ashok Ajoy
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View article: Observation of constructive interference at the edge of quantum ergodicity
Observation of constructive interference at the edge of quantum ergodicity Open
The dynamics of quantum many-body systems is characterized by quantum observables that are reconstructed from correlation functions at separate points in space and time1-3. In dynamics with fast entanglement generation, however,…
View article: Experimental observation of a time rondeau crystal
Experimental observation of a time rondeau crystal Open
Conventional phases of matter can be characterized by the symmetries they break, one example being water ice whose crystalline structure breaks the continuous translation symmetry of space. Recently, breaking of time-translation symmetry w…
View article: Nanoscale engineering and dynamic stabilization of mesoscopic spin textures
Nanoscale engineering and dynamic stabilization of mesoscopic spin textures Open
Thermalization, while ubiquitous in physics, has traditionally been viewed as an obstacle to be mitigated. In contrast, we demonstrate here the use of thermalization in the generation, control, and readout of “shell-like” spin textures wit…
View article: Optically Detected Magnetic Resonance Imaging and Sensing Within Functionalized Additively Manufactured Microporous Structures
Optically Detected Magnetic Resonance Imaging and Sensing Within Functionalized Additively Manufactured Microporous Structures Open
Quantum sensing with nitrogen-vacancy centers in diamond has emerged as a powerful tool for measuring diverse physical parameters, yet the versatility of these measurement approaches is often limited by the achievable layout and dimensiona…
View article: Enhanced reactivity at the oil–water interface accelerates the synthesis of zymonic acid in microemulsions
Enhanced reactivity at the oil–water interface accelerates the synthesis of zymonic acid in microemulsions Open
Chemical reactions in microscale compartments, such as aerosols and emulsions, can exhibit significantly faster reaction rates relative to macroscale containers.
View article: Cryogenic Field-Cycling Instrument for Optical Nmr Hyperpolarization Studies
Cryogenic Field-Cycling Instrument for Optical Nmr Hyperpolarization Studies Open
View article: Quantum sensing of paramagnetic analytes by nanodiamonds in levitated microdroplets and aqueous solutions
Quantum sensing of paramagnetic analytes by nanodiamonds in levitated microdroplets and aqueous solutions Open
The role of the aqueous phase environment ( e.g. , pH and salt concentration) on the adsorption of gadolinium to the surface of nanodiamonds with nitrogen-vacancy (NV − ) centers is investigated in microdroplets and in bulk solution.
View article: Cryogenic field-cycling instrument for optical NMR hyperpolarization studies
Cryogenic field-cycling instrument for optical NMR hyperpolarization studies Open
Optical dynamic nuclear polarization (DNP) offers an attractive approach to enhancing the sensitivity of nuclear magnetic resonance (NMR) spectroscopy. Efficient, optically-generated electron polarization can be leveraged to operate across…
View article: High-precision chemical quantum sensing in flowing monodisperse microdroplets
High-precision chemical quantum sensing in flowing monodisperse microdroplets Open
A method is presented for high-precision chemical detection that integrates quantum sensing with droplet microfluidics. Using nanodiamonds (ND) with fluorescent nitrogen-vacancy (NV) centers as quantum sensors, rapidly flowing microdroplet…
View article: Fundamental bounds on many-body spin cluster intensities
Fundamental bounds on many-body spin cluster intensities Open
Multiple-quantum coherence (MQC) spectroscopy is a powerful technique for probing spin clusters, offering insights into diverse materials and quantum many-body systems. However, prior experiments have revealed a rapid decay in MQC intensit…
View article: High sensitivity pressure and temperature quantum sensing in organic crystals
High sensitivity pressure and temperature quantum sensing in organic crystals Open
The inherent sensitivity of quantum sensors to their physical environment can make them good reporters of parameters such as temperature, pressure, strain, and electric fields. Here, we present a molecular platform for pressure (P) and tem…
View article: Anomalously extended Floquet prethermal lifetimes and applications to long-time quantum sensing
Anomalously extended Floquet prethermal lifetimes and applications to long-time quantum sensing Open
Floquet prethermalization is observed in periodically driven quantum many-body systems where the system avoids heating and maintains a stable, non-equilibrium state, for extended periods. Here we introduce a novel quantum control method us…
View article: Discrete Time Crystal Sensing
Discrete Time Crystal Sensing Open
Prethermal discrete time crystals (PDTCs) are a nonequilibrium state of matter characterized by long-range spatiotemporal order, and exhibiting a subharmonic response stabilized by many-body interactions under periodic driving. The inheren…
View article: High-sensitivity multichannel zero-to-ultralow field NMR with atomic magnetometer arrays
High-sensitivity multichannel zero-to-ultralow field NMR with atomic magnetometer arrays Open
Despite its versatility and high chemical specificity, conventional NMR spectroscopy is limited in measurement throughput due to the need for high-homogeneity magnetic fields, necessitating sequential sample analysis, and bulky devices. He…
View article: High-precision chemical quantum sensing in flowing monodisperse microdroplets
High-precision chemical quantum sensing in flowing monodisperse microdroplets Open
We report on a novel flow-based method for high-precision chemical detection that integrates quantum sensing with droplet microfluidics. We deploy nanodiamond particles hosting fluorescent nitrogen vacancy defects as quantum sensors in flo…
View article: Experimental observation of a time rondeau crystal: Temporal Disorder in Spatiotemporal Order
Experimental observation of a time rondeau crystal: Temporal Disorder in Spatiotemporal Order Open
Our understanding of phases of matter relies on symmetry breaking, one example being water ice whose crystalline structure breaks the continuous translation symmetry of space. Recently, breaking of time translation symmetry was observed in…
View article: Room-temperature quantum sensing with photoexcited triplet electrons in organic crystals
Room-temperature quantum sensing with photoexcited triplet electrons in organic crystals Open
Quantum sensors have notably advanced high-sensitivity magnetic field detection. Here, we report quantum sensors constructed from polarized spin-triplet electrons in photoexcited organic chromophores, specifically focusing on pentacene-dop…
View article: Biomolecular and Characterization Imaging Science Program: 2023 Principal Investigator Meeting Proceedings
Biomolecular and Characterization Imaging Science Program: 2023 Principal Investigator Meeting Proceedings Open
The 2023 U.S. Department of Energy (DOE) Biological and Environmental Research (BER) program’s Biomolecular Characterization and Imaging Science (BCIS) Principal Investigator Meeting expanded in scope from previous Bioimaging Science Progr…
View article: Roadmap on Nanoscale Magnetic Resonance Imaging
Roadmap on Nanoscale Magnetic Resonance Imaging Open
The field of nanoscale magnetic resonance imaging (NanoMRI) was started 30 years ago. It was motivated by the desire to image single molecules and molecular assemblies, such as proteins and virus particles, with near-atomic spatial resolut…
View article: Nanoscale engineering and dynamical stabilization of mesoscopic spin textures
Nanoscale engineering and dynamical stabilization of mesoscopic spin textures Open
Thermalization phenomena, while ubiquitous in quantum systems, have traditionally been viewed as obstacles to be mitigated. In this study, we demonstrate the ability, instead, to harness thermalization to dynamically engineer and stabilize…
View article: Complex 3-Dimensional Microscale Structures for Quantum Sensing Applications
Complex 3-Dimensional Microscale Structures for Quantum Sensing Applications Open
We present a novel method for fabricating highly customizable three-dimensional structures hosting quantum sensors based on Nitrogen Vacancy (NV) centers using two-photon polymerization. This approach overcomes challenges associated with s…
View article: Understanding Water Chemistry in a Submicron Scale Environment with Quantum Sensing
Understanding Water Chemistry in a Submicron Scale Environment with Quantum Sensing Open
Water is ubiquitous on Earth and plays innumerable roles in geochemical processes.The properties of water vary considerably due to confinement, surface adsorption and solute composition.These environmental influences can vary at the fine s…
View article: Critical prethermal discrete time crystal created by two-frequency driving
Critical prethermal discrete time crystal created by two-frequency driving Open
We report the observation of long-lived Floquet prethermal discrete time crystalline (PDTC) order in a three-dimensional position-disordered lattice of interacting dipolar-coupled 13C nuclei in diamond at room temperature. We demonstrate a…
View article: Critical prethermal discrete time crystal created by two-frequency driving
Critical prethermal discrete time crystal created by two-frequency driving Open
We report the observation of long-lived Floquet prethermal discrete time crystalline (PDTC) order in a three-dimensional position-disordered lattice of interacting dipolar-coupled 13C nuclei in diamond at room temperature. We demonstrate a…
View article: Dual-space Compressed Sensing
Dual-space Compressed Sensing Open
Compressed sensing (CS) is a powerful method routinely employed to accelerate image acquisition. It is particularly suited to situations when the image under consideration is sparse but can be sampled in a basis where it is non-sparse. Her…
View article: Electron induced nanoscale nuclear spin relaxation probed by hyperpolarization injection
Electron induced nanoscale nuclear spin relaxation probed by hyperpolarization injection Open
We report on experiments that quantify the role of a central electronic spin as a relaxation source for nuclear spins in its nanoscale environment. Our strategy exploits hyperpolarization injection from the electron as a means to controlla…
View article: Continuously tracked, stable, large excursion trajectories of dipolar coupled nuclear spins
Continuously tracked, stable, large excursion trajectories of dipolar coupled nuclear spins Open
We report an experimental approach to excite, stabilize, and continuously track Bloch sphere orbits of dipolar-coupled nuclear spins in a solid. We demonstrate these results on a model system of hyperpolarized 13C nuclear spins in diamond.…
View article: Observation of a critical prethermal discrete time crystal created by two-frequency driving
Observation of a critical prethermal discrete time crystal created by two-frequency driving Open
We report the observation of long-lived Floquet prethermal discrete time crystalline (PDTC) order in a three-dimensional position-disordered lattice of interacting dipolar-coupled 13C nuclei in diamond at room temperature. We demonstrate a…
View article: High-Field Magnetometry with Hyperpolarized Nuclear Spins
High-Field Magnetometry with Hyperpolarized Nuclear Spins Open
Quantum sensors have attracted broad interest in the quest towards sub-micronscale NMR spectroscopy. Such sensors predominantly operate at low magnetic fields. Instead, however, for high resolution spectroscopy, the high-field regime is na…
View article: Rapidly enhanced spin polarization injection in an optically pumped spin ratchet
Rapidly enhanced spin polarization injection in an optically pumped spin ratchet Open
Rapid injection of spin polarization into an ensemble of nuclear spins is a problem of broad interest, spanning dynamic nuclear polarization (DNP) to quantum information science. We report on a strategy to boost the spin injection rate by …