A5037838873- Cold Atom Physics and Bose-Einstein Condensates
- Electron and X-Ray Spectroscopy Techniques
- Atomic and Subatomic Physics Research
- Quantum Information and Cryptography
- Non-Destructive Testing Techniques
- Quantum optics and atomic interactions
- Magnetic properties of thin films
- Quantum Mechanics and Applications
- Plasma Diagnostics and Applications
- ZnO doping and properties
- Laser-Matter Interactions and Applications
- Atomic and Molecular Physics
- Radiation Dose and Imaging
- Mechanical and Optical Resonators
- Magnetic and transport properties of perovskites and related materials
- Analytical Chemistry and Sensors
- Geophysics and Sensor Technology
- Particle accelerators and beam dynamics
- Nuclear Physics and Applications
- Quantum, superfluid, helium dynamics
- Advanced Chemical Physics Studies
- Electronic and Structural Properties of Oxides
- Advanced Frequency and Time Standards
- Computational Physics and Python Applications
- Advancements in Photolithography Techniques
University of California, Los Angeles
2020
Yale University
2013-2017
Harvard University
2016
Blackstone (United States)
2016
Durham University
2009-2012
University of New Orleans
2007-2008
Lawrence Berkeley National Laboratory
1992
University of California, Berkeley
1992
Stubbornly Spherical The shape of the electron's charge distribution reflects degree to which switching direction time impacts basic ingredients universe. Standard Model (SM) particle physics predicts a very slight asphericity distribution, whereas SM extensions such as supersymmetry posit bigger and potentially measurable, but still tiny, deviations from perfect sphere. Polar molecules have been identified ideal settings for measuring this asymmetry, should be reflected in finite electric...
We recently set a new limit on the electric dipole moment of electron (eEDM) (J. Baron et al., ACME collaboration, Science 343 (2014), 269-272), which represented an order-of-magnitude improvement previous and placed more stringent constraints many CP-violating extensions to Standard Model. In this paper we discuss measurement in detail. The experimental method associated apparatus are described, together with techniques used isolate eEDM signal. particular, detail way switches were suppress...
A quantum-state preparation scheme is demonstrated for the next generation ACME experiment searching electron electric dipole moment in ThO molecules, where stimulated Raman adiabatic passage technique, together with other experimental improvements, brings at least a 75 times increase combined and detection efficiency of molecules target state.
Planar magnetic nanowires have been vital to the development of spintronic technology. They provide an unparalleled combination reconfigurability, controllability, and scalability, which has helped realize such applications as racetrack memory novel logic gates. Microfabricated atom optics benefit from all these properties, we present first demonstration amalgamation technology with ultracold atoms. A interaction is exhibited through reflection a cloud 87Rb atoms at temperature 10 μK, 2 mm ×...
We perform entanglement of spin and motional degrees freedom a single, ground-state trapped ion through the application $16\phantom{\rule{0.28em}{0ex}}\mathrm{ps}$ laser pulse. The duration interaction is significantly shorter than both timescale ($30\phantom{\rule{0.28em}{0ex}}\textmu{}\text{s}$) precession ($1\phantom{\rule{0.28em}{0ex}}\text{ns}$), demonstrating that neither sets fundamental speed limit on this operation for quantum information processing. Entanglement demonstrated...
Laser-controlled entanglement between atomic qubits (`spins') and collective motion in trapped ion Coulomb crystals requires conditional momentum transfer from the laser. Since spin-dependent force is derived a spatial gradient spin-light interaction, this typically longitudinal -- parallel proportional to average laser $k$-vector (or two beams' difference), which constrains both direction relative magnitude of accessible spin-motion coupling. Here, we show how can also be transferred...
Trapped matter-wave interferometers (TMIs) present a platform for precision sensing within compact apparatus, extending coherence time by repeated traversal of confining potential. However, imperfections in this potential can introduce unwanted systematic effects, particularly when combined with errors the associated beamsplitter operations. This affect both interferometer phase and visibility, make performance more sensitive to other experimental imperfections. I examine character degree...
We present a scheme for creating tight and adiabatic time-averaged atom-traps through the piezoelectric actuation of nanomagnetic structures. show that potentials formed by circular translation magnetic structures have several advantages over conventional rotating-field techniques, particularly high trap frequencies. As magnitude is changed, trapping potential can be changed adiabatically between harmonic 3D confinement toroidal trap.
We have used the results of micromagnetic simulations to investigate effects nanowire geometry and domain wall magnetization structure on characteristic parameters magnetic atom traps formed by walls in planar ferromagnetic nanowires. It is found that when are near-field a both substantial effect trap frequency adiabaticity. also show certain regimes trap's depth depends only amplitude an externally applied rotating field, thus allowing it be tuned independently other critical parameters.
The use of high voltage (HV) electrodes in vacuum is commonplace physics laboratories. In such systems, it has long been known that electron emission from an HV cathode can lead to bremsstrahlung x rays; indeed, this the basic principle behind operation standard x-ray sources. However, laboratory setups where production not goal and no source deliberately introduced, field-emitted electrons accelerated by produce rays as unintended hazardous byproduct. Both level hazard safe operating...
We present a design for switchable nanomagnetic atom mirror formed by an array of 180° domain walls confined within Ni80Fe20 planar nanowires. A simple analytical model is developed which allows the magnetic field produced wall to be calculated. This then used optimize geometry nanowires so as maximize reflectivity mirror. describe fabrication nanowire and characterize its behavior using magneto-optic Kerr effect magnetometry, scanning Hall probe microscopy, micromagnetic simulations,...
We present a new approach to calculating magnetic fringing fields from head-to-head type domain walls in planar nanowires. In contrast calculations based on micromagnetically simulated structures the descriptions of are for most part analytic and thus significantly less time resource intensive. The models presented begin with an intuitive picture walls, which is built upon phenomenological manner. Comparisons calculated using micromagnetic methods show good quantitative agreement.
FeCo-codoped ZnO nanorods with room temperature ferromagnetic ordering have been synthesized by chemical vapor deposition. Detailed nanostructures were investigated field emission scanning electron microscopy (FESEM), transmission (TEM) and nanoprobe X-ray energy dispersive spectroscopy (EDS). The grown along <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</i> -axis of a single crystalline wurtzite structure no second phase was observed high...
We perform entanglement of spin and motional degrees freedom a single, ground-state trapped ion through the application $16$ ps laser pulse. The duration interaction is significantly shorter than both timescale ($30$ $\mu$s) precession ($1$ ns) , demonstrating that neither sets fundamental speed limit on this operation for quantum information processing. Entanglement demonstrated collapse revival coherence as components wavefunction separate recombine in phase space. infer fidelity these...
We are developing a surface‐conversion source, using 10 cm diameter solid barium converter, to produce D− ion beams suitable for acceleration by the ESQ accelerator. The temperature was found be ≊3% of converter bias potential. efficiency converting D+ is as high 4.8% but only 25% ions survived leave source without being stripped plasma or gas molecules. Some early results from RF discharges promising because their higher power and efficiency.
The interaction of ultra-cold atoms with magnetic microstructures has become the focus many recent experiments [1]. We present progress towards cold Rb fields from domain walls in nanowires. Fig. 1 a) shows out plane field such a wall. Micromagnetic simulations show that nanowires could be used to create atom traps frequencies MHz regime [2]. Transparent substrates can so microscopic loaded an optical lattice and small amount metal means usual Johnson noise heating effects avoided lifetimes...