A5081695029- Atomic and Molecular Physics
- Advanced Frequency and Time Standards
- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Subatomic Physics Research
- Advanced Chemical Physics Studies
- Nuclear physics research studies
- Scientific Measurement and Uncertainty Evaluation
- Radioactive Decay and Measurement Techniques
- Quantum, superfluid, helium dynamics
- Quantum Chromodynamics and Particle Interactions
- Quantum Mechanics and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Cardiovascular Syncope and Autonomic Disorders
- Noncommutative and Quantum Gravity Theories
- Advanced Fiber Laser Technologies
- Crystallography and Radiation Phenomena
- Electron and X-Ray Spectroscopy Techniques
- Quantum optics and atomic interactions
- Dark Matter and Cosmic Phenomena
- Muon and positron interactions and applications
- Advanced Physical and Chemical Molecular Interactions
- Spectroscopy and Laser Applications
- Advanced X-ray Imaging Techniques
- Galaxies: Formation, Evolution, Phenomena
- Quantum and Classical Electrodynamics
University of Delaware
2016-2025
Petersburg Nuclear Physics Institute
2013-2022
Peter the Great St. Petersburg Polytechnic University
2021
University of Maryland, College Park
2020
Joint Quantum Institute
2020
Kurchatov Institute
2018
Universität Hamburg
2008-2011
University of Nevada, Reno
2002-2011
UNSW Sydney
2009-2011
National Institute of Standards and Technology
2008-2009
Blackbody radiation (BBR) shifts of the $^{3}P_{0}\text{\ensuremath{-}}^{1}S_{0}$ clock transition in divalent atoms Mg, Ca, Sr, and Yb are evaluated. The dominant electric-dipole contributions computed using accurate relativistic many-body techniques atomic structure. At room temperatures, resulting uncertainties $E1$ BBR large substantially affect projected ${10}^{\ensuremath{-}18}$ fractional accuracy optical-lattice-based clocks. A peculiarity these clocks is that characteristic...
We carry out high-precision calculation of parity violation in a cesium atom, reducing theoretical uncertainty by factor 2 compared to previous evaluations. combine measurements with calculations and extract the weak charge 133Cs nucleus, QW=-73.16(29)expt(20)theor. The result is agreement standard model (SM) elementary particles. This most accurate to-date test low-energy electroweak sector SM. In combination results high-energy collider experiments, we confirm energy dependence (or...
We report vapor-cell magneto-optical trapping of Hg isotopes on the (1)S(0)-(3)P(1) intercombination transition. Six abundant isotopes, including four bosons and two fermions, were trapped. is heaviest nonradioactive atom trapped so far, which enables sensitive atomic searches for "new physics" beyond standard model. propose an accurate optical lattice clock based evaluate its systematic accuracy to be better than 10;{-18}. Highly stable Hg-based clocks will provide a new avenue research...
We evaluated the static and dynamic polarizabilities of 5s^2 ^1S_0 5s5p ^3P_0^o states Sr using high-precision relativistic configuration interaction + all-order method. Our calculation explains discrepancy between recent experimental - dc Stark shift measurement \Delta \alpha = 247.374(7) a.u. [Middelmann et. al, arXiv:1208.2848 (2012)] earlier theoretical result 261(4) [Porsev Derevianko, Phys. Rev. A 74, 020502R (2006)]. present value 247.5 is in excellent agreement with result. also...
We propose 10 highly charged ions as candidates for the development of next generation atomic clocks, quantum information, and search $\ensuremath{\alpha}$ variation. They have long-lived metastable states with transition wavelengths to ground state between 170--3000 nm, relatively simple electronic structure, stable isotopes, high sensitivity variation (e.g., ${\mathrm{Sm}}^{14+}$, ${\mathrm{Pr}}^{10+}$, ${\mathrm{Sm}}^{13+}$, ${\mathrm{Nd}}^{10+}$). predict their properties crucial...
We demonstrate single-shot imaging and narrow-line cooling of individual alkaline earth atoms in optical tweezers; specifically, strontium-88 trapped $515.2~\text{nm}$ light. achieve high-fidelity single-atom-resolved by detecting photons from the broad singlet transition while on narrow intercombination line, extend this technique to highly uniform two-dimensional arrays $121$ tweezers. Cooling during is based a previously unobserved Sisyphus mechanism, which we predict be applicable wide...
Abstract Optical atomic clocks are the most accurate and precise measurement devices of any kind, enabling advances in international timekeeping, Earth science, fundamental physics, more. However, there is a tradeoff between accuracy precision, where higher precision achieved by using more atoms, but this comes at cost larger interactions atoms that limit accuracy. Here, we propose many-ion optical clock based on three-dimensional Coulomb crystals order one thousand Sn 2+ ions confined...
In state-of-the-art optical lattice clocks, beyond-electric-dipole polarizability terms lead to a breakdown of magic wavelength trapping. this Letter, we report novel approach evaluate light shifts, specifically addressing recent discrepancies in the atomic multipolarizability term between experimental techniques and theoretical calculations. We combine imaging multi-ensemble shift coefficients, leveraging comparisons dual-ensemble clock rapidly differential frequency shifts. Further,...
We report calculations assessing the ultimate precision of an atomic clock based on 578 nm $6{}^{1}{S}_{0}\ensuremath{\rightarrow}6{}^{3}{P}_{0}$ transition in Yb atoms confined optical lattice trap. find that this has a natural linewidth less than 10 mHz odd isotopes, caused by hyperfine coupling. The shift due to trapping light acting through lowest order ac polarizability is found become zero at magic trap wavelength about 752 nm. effects Rayleigh scattering, multipole polarizabilities,...
We discuss results of the most accurate to-date test low-energy electroweak sector standard model elementary particles. Combining previous measurements with our high-precision calculations we extracted weak charge $^{133}\mathrm{Cs}$ nucleus, ${Q}_{W}=\ensuremath{-}73.16(29{)}_{\mathrm{exp}}(20{)}_{\mathrm{th}}$ [S. G. Porsev, K. Beloy, and A. Derevianko, Phys. Rev. Lett. 102, 181601 (2009)]. The result is in perfect agreement ${Q}_{W}^{\mathrm{SM}}$ predicted by model,...
We consider the excitation of nuclear transition $^{229g}\mathrm{Th}\mathrm{\text{\ensuremath{-}}}^{229m}\mathrm{Th}$ near 7.6 eV in singly ionized thorium via an electronic bridge process. The process relies on electron shell by two laser photons whose sum frequency is equal to frequency. This scheme allows us determine with high accuracy. Based calculations level structure ${\mathrm{Th}}^{+}$ which combine configuration-interaction method and many-body perturbation theory, we estimate that...
The 7.6 eV electromagnetic transition between the nearly degenerate ground state and first excited in $^{229}\mathrm{Th}$ nucleus may be very sensitive to potential changes fine-structure constant, $\ensuremath{\alpha}={e}^{2}/\ensuremath{\hbar}c$. However, sensitivity is not known, nuclear calculations are currently unable determine it. We propose measurements of differences atomic frequencies thorium atoms (or ions) with (isomeric) state. This will enable extraction change charge radius...
We propose a new frequency standard based on $4f^{14} 6s6p~ ^3\!P_0 - 4f^{13} 6s^2 5d ~(J=2)$ transition in neutral Yb. This has potential for high stability and accuracy the advantage of highest sensitivity among atomic clocks to variation fine-structure constant $\alpha$. find its dimensionless $\alpha$-variation enhancement factor be $K=-15$, comparison most sensitive current clock (Yb$^+$ E3, $K=-6$), it is 18 times larger than any neutral-atomic (Hg, $K=0.8$). Combined with...
Until recently, ground-state nuclear moments of the heaviest nuclei could only be inferred from spectroscopy, where model assumptions are required. Laser spectroscopy in combination with modern atomic structure calculations is now able to probe these directly, a comprehensive and nuclear-model-independent way. Here we report on unique access differential mean-square charge radii ^{252,253,254}No, therefore changes size shape. State-of-the-art density functional describe well region heavy...
We demonstrate state-dependent optical lattices for the Sr qubit at tune-out wavelength its ground state. tightly trap excited state atoms while suppressing effect of lattice on by more than 4 orders magnitude. This highly independent control over states removes inelastic collisions as main obstacle quantum simulation and computation schemes based qubit. Our results also reveal large discrepancies in atomic data used to calibrate largest systematic clocks.
We used the monochromatic soft-x-ray beamline P04 at synchrotron-radiation facility PETRA III to resonantly excite strongest $2p-3d$ transitions in neon-like Ni XIX ions, $[2p^6]_{J=0} \rightarrow [(2p^5)_{1/2}\,3d_{3/2}]_{J=1}$ and [(2p^5)_{3/2}\,3d_{5/2}]_{J=1}$, respectively dubbed 3C 3D, achieving a resolving power of 15\,000 signal-to-background ratio 30. obtain their natural linewidths, with an accuracy better than 10\%, as well oscillator-strength $f(3C)/f(3D)$ = 2.51(11) from...
We consider long-range interactions between two alkali-metal atoms in their respective ground states. extend the previous relativistic many-body calculations of C_6 dispersion coefficients [Phys.Rev. Lett. {\bf 82}, 3589 (1999)] to higher-multipole C_8 and C_10. A special attention is paid usually omitted contribution core-excited calculate this within random-phase approximation demonstrate that for heavy core excitations contribute as much 10% coefficients. tabulate results both homonuclear...
Hyperfine quenching rates of the lowest-energy metastable $^{3}P_{0}$ and $^{3}P_{2}$ states Mg, Ca, Sr, Yb atoms are computed. The calculations carried out using ab initio relativistic many-body methods. computed lifetimes may be useful for designing novel ultraprecise optical clocks trapping experiments with fermionic isotopes. resulting natural widths $^{3}P_{0}\ensuremath{-}^{1}S_{0}$ clock transition $0.44\phantom{\rule{0.3em}{0ex}}\text{mHz}$ $^{25}\mathrm{Mg}$,...
The results of ab initio calculation E1 amplitudes, lifetimes,and polarizabilities for several low-lying levels ytterbium are reported. effective Hamiltonian the valence electrons has been constructed in frame CI+MBPT method and solutions many electron equation found.