Article
Physics, Multidisciplinary
Meirav Pinkas, Or Katz, Jonathan Wengrowicz, Nitzan Akerman, Roee Ozeri
Summary: The formation of weakly bound molecular states between an ultracold atom and a single trapped ion in the presence of a linear Paul trap is observed. It is found that bound states can efficiently form in binary collisions, enhancing the rate of inelastic processes. The dependence of the molecular properties on the trapping parameters enables further studies on the characterization and control of ultracold collisions.
Article
Optics
Qingchuan Huang, Tetsuya Kawanishi
Summary: A novel RF phase measurement method using optical modulation was proposed, achieving picosecond-level accuracies by measuring the output sideband power of the optical modulator. This technique is expected to be useful for radio-over-fiber-based antenna array systems.
Article
Physics, Nuclear
Piyasi Biswas, A. Mukherjee, Saikat Bhattacharjee, D. Chattopadhyay, Subinit Roy, S. Santra, S. K. Pandit, K. Ramachandran, K. Mahata, A. Shrivastava
Summary: The excitation function for quasielastic scattering of weakly bound projectile Li-6 on a Tb-159 target at large backward angle has been measured, and the quasielastic barrier distribution has been extracted. The centroid of the quasielastic barrier distribution, including alpha particles, is found to shift towards higher energy relative to the fusion barrier distribution for the system. This shift is attributed to the low alpha-breakup threshold of the Li-6 nucleus.
Article
Materials Science, Multidisciplinary
N. Siminel, K. Sushkevich, S. Aazou, A. Micu, A. Siminel, Z. Sekkat, L. Kulyuk
Summary: The temperature dependence of the luminescence spectra of MoSe2 crystals intercalated with I2 molecules has been investigated. The luminescence spectrum consists of a zero-phonon doublet and its phonon replicas, caused by the recombination of excitons bound on iodine molecules embedded in the van der Waals gap. The rate of radiative recombination of the B state is found to be 76 times higher than the A state.
OPTICAL MATERIALS EXPRESS
(2023)
Article
Instruments & Instrumentation
N. Kurz, D. Fischer, T. Pfeifer, A. Dorn
Summary: We implemented a far-off-resonant, optical dipole force trap in a reaction microscope combined with a magneto-optical trap and conducted kinematically complete multi-photon ionization experiments. The experiments allowed us to distinguish different ionization mechanisms and successfully detected weakly bound dimers using three-photon ionization with 30 femtosecond pulses.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2021)
Article
Physics, Multidisciplinary
Sh Hamada, N. Burtebayev, Awad A. Ibraheem
Summary: This research investigated reaction dynamics of Li-6 ions on Pb-208 target using different potentials, finding that the strength of SPP and CFM potentials needs to be reduced to reproduce experimental data, and introducing a dynamic polarization potential to explain the observed reduction in potential strength.
REVISTA MEXICANA DE FISICA
(2022)
Article
Physics, Multidisciplinary
Shinsuke Haze, Jose P. D'Incao, Dominik Dorer, Markus Deiss, Eberhard Tiemann, Paul S. Julienne, Johannes Hecker Denschlag
Summary: We explore the physical origin and general validity of a propensity rule for the conservation of hyperfine spin state in three-body recombination. By testing the rule on Rb-85, which has different scattering properties from Rb-87, we observe that the rule also holds for Rb-85. Through experimental observations and theoretical analysis, we gain understanding of the conservation of hyperfine spin state and identify criteria to judge its applicability to other elements and collision channels.
PHYSICAL REVIEW LETTERS
(2022)
Editorial Material
Multidisciplinary Sciences
Simon L. Cornish, Jeremy M. Hutson
Article
Chemistry, Physical
Samuel G. H. Brookes, Jeremy M. Hutson
Summary: We obtain the interaction potential for NaCs through fitting experiments and use coupled-channel calculations to understand the properties of molecular states and Feshbach resonance, as well as their relationships with experimental quantities.
JOURNAL OF PHYSICAL CHEMISTRY A
(2022)
Article
Physics, Multidisciplinary
S. Spence, R. Brooks, D. K. Ruttley, A. Guttridge, Simon L. Cornish
Summary: The authors report simultaneous Raman sideband cooling of a single Rb-87 atom and a single Cs-133 atom held in separate optical tweezers. They demonstrate cooling of single Rb atoms in an array of four tweezers and prepare the atoms in the relative motional ground state with high efficiency. This work is a crucial step towards the formation of single RbCs molecules confined in optical tweezer arrays.
NEW JOURNAL OF PHYSICS
(2022)
Article
Computer Science, Interdisciplinary Applications
Jacob A. Blackmore, Philip D. Gregory, Jeremy M. Hutson, Simon L. Cornish
Summary: This article presents a computer program for calculating the quantized rotational and hyperfine energy levels of (1)sigma diatomic molecules in the presence of various fields. It is applicable to state-of-the-art experiments with ultracold molecular gases.
COMPUTER PHYSICS COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
Daniel K. Ruttley, Alexander Guttridge, Stefan Spence, Robert C. Bird, Ruth Le Sueur, Jeremy M. Hutson, Simon L. Cornish
Summary: We successfully form a single RbCs molecule by merging two optical tweezers containing a single Rb atom and a single Cs atom. Both atoms are initially in the ground states of their respective tweezers. By measuring the binding energy, we confirm molecule formation and determine its state. We show that the probability of molecule formation can be controlled by tuning the confinement of the traps during the merging process, in agreement with calculations. We demonstrate that the conversion efficiency from atoms to molecules using this technique is comparable to magnetoassociation.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Matthew D. Frye, Jeremy M. Hutson
Summary: In this study, we examine the long-range states of complexes formed by alkali-metal diatomic molecules in a singlet state and alkali-metal atoms. We investigate the structure of the Hamiltonian for such systems and the interactions between the six angular momenta. We analyze the patterns and densities of the long-range states, as well as the Hamiltonian terms that can result in Feshbach resonances when the states cross threshold at varying magnetic fields. Using 40K 87Rb + 87Rb as a case study, we demonstrate multiple resonance types due to long-range states with rotational and/or hyperfine excitation, and discuss their likelihood at low to moderate magnetic fields.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Physics, Multidisciplinary
Shinsuke Haze, Jose P. D'Incao, Dominik Dorer, Jinglun Li, Markus Deiss, Eberhard Tiemann, Paul S. Julienne, Johannes Hecker Denschlag
Summary: By conducting experimental and theoretical studies, we have found that the production rate of molecules in the three-body recombination reaction of ultracold Rb decreases with the increase of binding energy Eb, and the formation rate approximately scales as E-alpha b, where alpha is approximately 1. Apart from a possible centrifugal barrier suppression for low binding energies, the formation rate varies only within a factor of two for different rotational angular momenta of the molecular product. We have also proposed a perturbative model to explain the physical origin of the energy scaling of the formation rate and found that the scaling law potentially holds universally for a broad range of interaction potentials.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Optics
Yaakov Yudkin, Paul S. Julienne, Lev Khaykovich
Summary: This article investigates the influence of the near degeneracy of two near-degenerate two-body continua on the few-body physics in ultracold collisions of bosonic lithium atoms. A minimal model with two atomic continua and one closed molecular channel is used for analysis, allowing the study of the spin composition of loosely bound dimers and trimers. The results show qualitative agreement with the well-established coupled-channel calculation phenomenology of lithium in the two-body sector, while the Efimov trimer energy levels in the three-body sector follow a different functional form compared to a single continuum scenario. The study suggests that the experimentally observed exotic behavior of the first excited Efimov energy level is most likely caused by the short-range details of the interaction potential.
Article
Physics, Multidisciplinary
Jiri Etrych, Gevorg Martirosyan, Alec Cao, Jake A. P. Glidden, Lena H. Dogra, Jeremy M. Hutson, Zoran Hadzibabic, Christoph Eigen
Summary: By combining bound-state spectroscopy and loss spectroscopy, we identified eight intrastate and six interstate Feshbach resonances in 39K. We characterized four intrastate and two interstate resonances, and our coupled-channel scattering calculations matched well with the experimental results. This study provides a precise map of the scattering length and allows for precise measurements of Efimov physics phenomena.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Physics, Multidisciplinary
Bijit Mukherjee, Matthew D. Frye, Jeremy M. Hutson
Summary: We investigate the mechanisms of magnetically tunable Feshbach resonances in ultracold collisions between atoms in 2S and 3P0 states, and identify the relevant terms in the collision Hamiltonian. These resonances involve indirect coupling between the open and closed channels, via intermediate channels involving atoms in 3P1 states. The resonance widths are generally proportional to the square of the magnetic field and are strongly enhanced when the background scattering length is large. By choosing different isotopes of the 3P0 atom, the scattering length can be discretely tuned. Promising combinations for large background scattering length and resonances at experimentally accessible field are 87Rb + Yb, Cs + Yb, and 85Rb + Sr.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Physics, Multidisciplinary
Tobias Franzen, Alexander Guttridge, Kali E. Wilson, Jack Segal, Matthew D. Frye, Jeremy M. Hutson, Simon L. Cornish
Summary: We report the observation of magnetic Feshbach resonances between Yb-173 and Cs-133, where resonant atom loss is observed due to the resonances at around 622 G and 702 G. The observed splittings of Yb nuclear spin components are attributed to its interaction with Cs electronic spin, which also provides the main coupling mechanism for the observed resonances. The experimental results are in good agreement with theoretical predictions.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Optics
Ang Li, Yaakov Yudkin, Paul S. Julienne, Lev Khaykovich
Summary: This study applies a recently developed three-channel model to analyze experimental results near a narrow Feshbach resonance. The analysis suggests that the observed position of the Efimov resonance is predominantly determined by the resonance physics rather than the van der Waals tail of the interatomic potential, and another Feshbach resonance significantly influences the resonance position.
Article
Optics
Zhichao Guo, Fan Jia, Bing Zhu, Lintao Li, Jeremy M. Hutson, Dajun Wang
Summary: This research provides an improved characterization of the commonly used Feshbach resonance between Na-23 and Rb-87 in their absolute ground states, and presents a series of experimental results regarding the measurement of binding energies and calculation of potential energies via magnetic-field modulation. Additionally, ten additional Feshbach resonances are observed in different combinations of Zeeman sublevels of the F = 1 hyperfine states.
Article
Optics
Bijit Mukherjee, Matthew D. Frye, Jeremy M. Hutson
Summary: In this study, magnetically tunable Feshbach resonances in ultracold collisions of Rb and Yb were investigated. Resonances for P-3(2) state were found to be decayed, while resonances for P-3(0) state were promising for magnetoassociation.
