Atomic Physics
Atomic and molecular structure, spectra, collisions, and data. Atoms and molecules in external fields. Molecular dynamics and coherent and optical control. Cold atoms and molecules. Cold collisions. Optical lattices.
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A QED Coulomb calculation predicts bound and resonant states from −30 to −1 eV, a clean analog of tetraquark physics.
· “Trilepton and tetralepton bound and resonant states: the QED counterpart of multiquark states”
Purcell-enhanced emission lets a neutral-atom node tell bright from dark states in 200 ns, not hundreds of microseconds.
· “Ultrafast high-fidelity state readout of single neutral atom”
Axial constructive interference makes a linear ion crystal act as a directional free-space light collector.
· “Coherent enhancement of collection of light from linear ion crystals”
Precise isotope-shift calculations benchmark the corrections needed to extract Vud from superallowed beta decays.
Thermal atoms from a microchannel array reach strong cavity coupling and emit heralded sub-Poissonian light.
Relativistic reanalysis of 1967 atomic-beam data raises B by 1.7% and aligns Q with few-body results.
· “Revisiting the hyperfine interval for the 2s2p ³\!P_(J) state in ⁹Be”
Fifty years untested; the new fit puts the constant near zero, sharpening mercury clocks and EDM searches.
· “The hyperfine anomaly in mercury and test of the Moskowitz-Lombardi rule”
The two-color rate formula matches TDDFT for α-quartz, giving a fast route to strong-field control experiments.
· “Electron Excitation Probability in Dielectrics under Two-color Intense Laser Fields”
Fringes no longer shift with lattice-depth drifts at the magic depth, stabilizing compact force sensors.
· “Continuously trapped matter-wave interferometry in magic Floquet-Bloch band structures”
Closed formulas cover size, recoil, and polarizability; all muonic numbers sit below current error bars.
· “Radiative corrections to the nuclear size and polarizability effects in atomic systems”
New 35Cl and 37Cl radii also fix a differential radius precise enough to anchor laser spectroscopy of chlorine isotopes.
Weak nonlinearity gives integer transport; strong nonlinearity gives fractional steps like -1/2 and -1/3.
· “Topological Invariants in Nonlinear Thouless Pumping of Solitons”
The V-RAP mechanism cancels two ionization pathways, suppressing c2 and c4 vortices in potassium.
A 2π×80 kHz intermediate state makes one-way STIRAP transfer 71% efficient at 1 µK.
· “Spectroscopy and Ground-State Transfer of Ultracold Bosonic ³⁹K¹³³Cs Molecules”
Aim at the entrance tangent: electron acceptance ~0.4, positron ~0.8; wrong angle silences the source.
Phase-controlled asymmetry in neon's electron spectrum matches analytical predictions, enabling an FEL probe.
· “Coherent Control of Ion-Photoelectron Dynamics through Rabi Oscillations: An ab initio study”
Resolving dielectronic-recombination resonances to n=11 validates the atomic code behind hot-plasma X-ray models.
· “Comprehensive Laboratory Benchmark of K-shell Dielectronic Satellites of Fe XXV-XXI Ions”
A hollow-core beam geometry makes direct narrow-line MOT loading work at low green power, aiding portable clocks.
· “Efficient direct loading of the green MOT of Yb with low green laser power”
A dual-axis acousto-optic deflector paints blue-detuned optical potentials over a 2.8 mm field, with a measured edge sharpness p=152 and…
· “Large, ultra-flat optical traps for uniform quantum gases”
Many-body theory predicts binding 650 times stronger than scattering estimates, and weaker than in benzene.
· “Many-body theory calculations of positron binding to parabenzoquinone”
Retrieving a stored photon deposits a vibrational quantum, and weak traps make the decay rate grow over time.
New formulas with no radius expansion for recoil finite-size shifts apply to muonic and electronic atoms.
· “Recoil corrections with finite nuclear size in hydrogenic systems”
Momentum-based time reconstruction turns an optical dipole trap into a nanosecond clock for Rydberg wave packets.
· “A Continuous Pump-Probe Experiment to Observe Zeeman Wave Packet Dynamics”
Time-shared optical tweezers cut per-atom laser power and still rearrange the array, clearing a path to larger qubit systems.
Measured acceleration sensitivity of 3.00 matches the predicted value, easing a key constraint on compact atom accelerometers.
· “A large-momentum-transfer Raman atom interferometer without k-reversal”
Doppler-free UV spectra of all five v=14 rotational levels pin the ultracold-collision parameter directly from one binding energy.
Resonant electron levels in Th+ let two laser steps drive the 8.4 eV nuclear transition, and may explain the isomer's short lifetime.
· “Resonance nuclear excitation of the ²²⁹Th nucleus via electronic bridge process in Th~II”
Grover amplification turns single-photon phase shifts into deterministic many-atom entanglement in O(N^1/4) steps.
· “Efficient preparation of entangled states in cavity QED with Grover's algorithm”
A simple saturated-absorption setup on the 459 nm cesium line matches the best compact optical references.
· “Cs microcell optical reference at 459 nm with short-term frequency stability below 2 times 10⁻¹³”
In cold-atom snapshots, the subsystem Loschmidt echo measures entropy and Hilbert-space fragmentation directly.
· “Probing quantum many-body dynamics using subsystem Loschmidt echos”
Both electrons and nuclei move as quantum walkers, capturing correlations that mean-field Hartree-Fock misses.
· “Molecular dynamics with time dependent quantum Monte Carlo”
Two mirrored gate copies cancel first-order errors; a buffer-atom measurement heralds success.
· “Analysis of heralded higher-fidelity two-qubit entangling gates with self-correction”
Relativistic ions see the field multiplied by Lorentz factor 2395, turning one dipole magnet into a resonance and polarization control.
Phase-sensitive S-band sensing hits 3.2 µV/cm/√Hz without radiating a same-frequency local oscillator.
Fission-fragment thermalization in helium shows yield ratios varying between isotopes and nuclear isomers, beyond known isotope effects.
· “Anomalous nuclear effects on ion charge state distribution in helium gas”
Overcritical regime is reachable, and tighter focusing beyond an optimum lowers the yield.
One-electronvolt shifts would fix the isovector parameter and aid neutron-antineutron oscillation searches.
Shallow-trap loading plus deep-trap holding yields a 79% filling fraction without atom rearrangement.
Coherent pair rotations, 3-second Ramsey fringes, and parallel field sensing all follow from one quadratic energy shift.
· “Coherent control over the high-dimensional space of the nuclear spin of alkaline-earth atoms”
One resonant beam at 456 nm produces 852 nm fluorescence at about 1 percent efficiency, making a simple down-converter.
· “Blue laser induced bright red fluorescence in hot cesium vapor”
Near-perfect, 0.1 ms transfer at a 'sweet spot' between three trapped strontium atoms.
· “Transferring vibrational states of trapped atoms via a Rydberg electron”
Tuning the electron energy through autoionizing states reveals spin effects blocked in ordinary scattering.
· “Electron polarization in the resonant inelastic scattering on hydrogen-like ions”
Resonance curves and autoionization widths fill the missing molecular data for NH+ dissociative recombination.
· “Rydberg states and new resonant states of the imidogen molecule NH: pathways for nitrogen release”
Hologram-computing network replaces serial assembly, making defect-free multi-thousand-atom arrays routine.
A 20-mm chip with one laser beam cools both Rb and Cs toward precision clocks and sensors.
Adding two-photon loss turns a runaway instability into coexisting normal and superradiant steady states.
· “Dissipative Phase Transition in the Two-Photon Dicke Model”
A Bayesian optimizer that probes sparse regions tunes cold atoms to near-recoil temperatures in minutes, not hours.
Inelastic scattering of one trapped rubidium atom yields S=2.61, a spin-free route to entangled photons for quantum networks.
· “Purcell-Enhanced Generation of Photonic Bell States via the Inelastic Scattering of Single Atoms”
A 4 K cryopump and <50 K walls give vacuum-limited trapping plus coherent Rydberg control in one high-optical-access platform.
· “A high optical access cryogenic system for Rydberg atom arrays with a 3000-second trap lifetime”
Simulations show ±100-attosecond delay and advance patterns that survive orientational averaging and can be seen by pump-probe chronoscopy.
· “Diffraction patterns in attosecond photoionization time delay”
Frequency shifts reduce the pairing ratio and rate; a stronger coupling field restores them.
· “Frequency-tunable biphoton generation via spontaneous four-wave mixing”
Review: compact magnetometers and spin amplifiers now rival stellar cooling bounds in several mass windows.
· “Searches for exotic spin-dependent interactions with spin sensors”
Ramsey fringes on a 30-atom dysprosium chain show a frequency shift that evolves in time toward the low-excitation collective Lamb shift.
· “Single-atom resolved collective spectroscopy of a one-dimensional atomic array”
Quasibound states of (He-p-mu), (He-d-mu), (Li-p-mu), (Li-d-mu) now have reported binding energies.
· “Resonant states of muonic three-particle systems with lithium, helium and hydrogen nuclei”
Trapped formaldehyde's opposite-rotation states stay coherent and ignore electric field strength.
· “Coherence of Symmetry-Protected Rotational Qubits in Cold Polyatomic Molecules”
Per-atom velocity reconstruction turns thermal positronium and muonium beams into precision interferometers.
· “Two-Photon Optical Ramsey-Doppler Spectroscopy of Positronium and Muonium”
Tuning the phase of a two-color field moves the second electron's most likely momentum off zero.
E1 half-lives yield lab-frame nuclear moments 2-3 orders above single-particle estimates in pear-shaped isotopes.
· “Enhanced nuclear Schiff and electric dipole moments in nuclei with an octupole deformation”
At high excitation, each eigenfunction matches a uniform mix of elliptic orbits with the same $E$, $L$, and $L_z$.
· “How Are Quantum Eigenfunctions of Hydrogen Atom Related To Its Classical Elliptic Orbits?”
Matches full quantum simulation and a 138Ba+ EIT experiment, predicting where cooling flips to heating.
· “Laser cooling trapped-ion crystal modes beyond the Lamb-Dicke regime”
SO(2,1) symmetry protects the mode even at 52% cloud-size excitation; its residual damping matches technical noise.
· “Persistent breather and dynamical symmetry in a unitary Fermi gas”
Comb-calibrated Doppler-free spectroscopy gives the most precise 200Hg-202Hg isotope shift yet: 5295570 ± 15 ± 8 kHz.
· “Comb-referenced Doppler-free spectrometry of the ²⁰⁰Hg and ²⁰²Hg intercombination line at 254 nm”
The 1034-nm dressing beam replaces the usual two-stage MOT sequence for alkaline-earth atoms.
The full 5D rates overshoot by 10 to 100 times; agreement appears only when the anion ends in j=0.
· “Ro-vibrational quenching calculations of C₂^- in collision with H₂”
Feedback that beats the bias field gives harmonics, chaos, and combs; a pulse mode adds a tunable cavity-free comb.
One echo of a scrambling Hamiltonian gives a sensor at η≈2/N, within a factor of two of the Heisenberg limit.
· “A Universal Protocol for Quantum-Enhanced Sensing via Information Scrambling”
A stroboscopic dressing scheme makes effective interactions that no sum of pairwise terms can match.
· “Resonant stroboscopic Rydberg dressing: electron-motion coupling and multi-body interactions”
Direct two-qubit swap is possible with modulated laser pulses, no three-gate decomposition needed.
· “Design fast Rydberg blockade SWAP gates with synthetic modulated driving”
The hadronic correction is far below the 10 kHz precision goal and safe to ignore for the electron-muon mass ratio.
· “Hadronic light-by-light scattering contribution to 1S-2S transition in muonium”
Neon measurements show Coulomb focusing and backscattering at the parent ion beyond the impulse approximation.
Vibration-resolved excitation, attachment, and dissociation data now feed fusion plasma and ion-source models.
· “Vibrational excitation and dissociation of deuterium molecule by electron impact”
Cosine modulation addresses two momentum pairs and sets their relative phase electronically, immune to laser phase noise.
· “Coherent coupling of momentum states: selectivity and phase control”
New laser data on 53,54Ca show a robust N=32 shell closure and put nuclear models to a sharp test.
First-ever ground-state constraint on the K−n interaction, closing a five-decade gap in strangeness physics.
Replaces per-Z variational runs: a single formula covers the whole helium-like energy sequence.
Short matter-wave revival and lattice recapture give microscopes local access to off-diagonal correlations.
Reads 3D electron momenta without a pulsed source, exposing two resonant channels and a decay-fed third.
· “Resonant photoionization dynamics during optical trapping of lithium atoms”
Quantum logic spectroscopy turns a stripped thorium nucleus into a readable clock for fundamental-physics tests.
Direct 1530 nm emission from rubidium yields 91.4% spin-photon fidelity, a first for neutral atoms.
· “Bell nonlocality with directly generated telecom-band spin-photon entanglement”
By controlling the central domain's polarization, spin currents can accelerate, suppress, or reverse wall motion.
· “Coherent Control of Domain-Wall Transport in an Ultracold Bose Gas”
