A5062929508- Diamond and Carbon-based Materials Research
- High-pressure geophysics and materials
- Force Microscopy Techniques and Applications
- Electronic and Structural Properties of Oxides
- Atomic and Subatomic Physics Research
- Quantum and electron transport phenomena
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum optics and atomic interactions
- Quantum Information and Cryptography
- Spectroscopy and Quantum Chemical Studies
- Spectroscopy and Laser Applications
- Mechanical and Optical Resonators
- Advanced Surface Polishing Techniques
- Quantum many-body systems
- Electrochemical Analysis and Applications
- Advanced Fiber Laser Technologies
- Quantum Computing Algorithms and Architecture
- Infrared Target Detection Methodologies
- Mass Spectrometry Techniques and Applications
- Electron and X-Ray Spectroscopy Techniques
- Molecular spectroscopy and chirality
- Thin-Film Transistor Technologies
- CCD and CMOS Imaging Sensors
- scientometrics and bibliometrics research
- Graphene research and applications
Lawrence Berkeley National Laboratory
2018-2024
University of California, Berkeley
2018-2023
Washington University in St. Louis
2014
Texas Instruments (United States)
1987
Characterizing the local internal environment surrounding solid-state spin defects is crucial to harnessing them as nanoscale sensors of external fields. This especially germane case defect ensembles which can exhibit a complex interplay between interactions, fields, and lattice strain. Working with nitrogen-vacancy (NV) center in diamond, we demonstrate that electric fields dominate magnetic resonance behavior NV at low field. We introduce simple microscopic model quantitatively captures...
Pressure alters the physical, chemical and electronic properties of matter. The development diamond anvil cell (DAC) enables tabletop experiments to investigate a diverse landscape high-pressure phenomena ranging from planetary interiors transitions between quantum mechanical phases. In this work, we introduce utilize novel nanoscale sensing platform, which integrates nitrogen-vacancy (NV) color centers directly into culet (tip) anvils. We demonstrate versatility platform by performing...
Ensembles of nitrogen-vacancy (N-$V$) centers in diamond show promise as versatile electric field sensors, but are limited by noise from an inhomogeneous internal charge environment. Here researchers develop a scheme for optically enhanced electrometry that improves N-$V$ sensitivity to external fields, especially at low temperatures. They also implement complementary method experimentally extracting the color center's excited-state susceptibilities, and they provide simple scaling theory...
Moiré superlattices in van der Waals (vdW) heterostructures form by stacking atomically thin layers on top of one another with a twist angle or lattice mismatch. The resulting moiré potential leads to strong modification the band structure, which can give rise exotic quantum phenomena ranging from correlated insulators and superconductors excitons Wigner crystals. Here, we demonstrate dynamic tuning WSe2/WS2 heterostructure at cryogenic temperature. We utilize optical fiber tip scanning...
By directly altering microscopic interactions, pressure provides a powerful tuning knob for the exploration of condensed phases and geophysical phenomena. The megabar regime represents an exciting frontier, where recent discoveries include novel high-temperature superconductors, as well structural valence phase transitions. However, at such high pressures, many conventional measurement techniques fail. Here, we demonstrate ability to perform local magnetometry inside diamond anvil cell with...
A scanning tunneling microscope was applied to the lithographic microprocessing of amorphous materials in air. Phase transformations were induced thin-film a-Si:H on silicon by low-energy electron irradiation. Electronic characterization surface before and after phase transformation indicated a change local conductivity directly below tip. Submicrometer lines formed these thin films application multiple, 10-V, 35-μs voltage pulses between tip sample. The imaged with STM imaging mode....
A qubit sensor with an electric dipole moment acquires additional contribution to its depolarization rate when it is placed in the vicinity of a polar or dielectric material as consequence electrical noise arising from polarization fluctuations material. Here, we characterize this relaxation function experimentally tunable parameters such sample-probe distance, probe-frequency, and temperature, demonstrate that offers window into properties insulating materials over wide range frequencies...
Low light level imaging with commercially available CCDs has been limited by CCD availability as well poor performance at low signal levels many devices constructed for consumer applications. These limitations usually take the form of charge-transfer efficiency temperatures and/or high noise associated charge-detection schemes that normally need to operate only near room temperature. This paper describes a commercial virtual-phase and operating mode allow temperatures. capability makes...