Article
Optics
Zehua Zhang, Xin He, Lili Wang, Peng Zhang
Summary: The transition position of Bi3+ ion in Ln(2)O(3) phosphors is influenced by covalency and coordination number, leading to variations in photoluminescence performances among different crystal structures.
JOURNAL OF LUMINESCENCE
(2021)
Article
Physics, Multidisciplinary
Gloria Clausen, Paul Jansen, Simon Scheidegger, Josef A. Agner, Hansjurg Schmutz, Frederic Merkt
Summary: A recent study presented experimental ionization energies of the 2 S-3(1) and 2 P-3 states of helium, revealing significant discrepancies with the alpha(7)m Lamb shift predictions, potentially indicating unknown theoretical contributions to the Lamb shifts of these states.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Grady Kestler, Khang Ton, Dmytro Filin, Marianna S. Safronova, Julio T. Barreiro
Summary: Accurate prediction of magic wavelengths requires precise knowledge of electric dipole matrix elements of atomic transitions. In this study, a magic wavelength near 473 nm for the 5s2 1S0 -5s5p 3P1 intercombination transition of 88Sr was calculated and measured, showing good agreement with theoretical calculations.
Article
Optics
Tanaporn Na Narong, TianMin Liu, Nikhil Raghuram, Leo Hollberg
Summary: We analyzed bichromatic and polychromatic stimulated forces for laser cooling and trapping of Yb atoms using the narrow S-1(0) -> P-3(1) transition. By numerically solving optical Bloch equations for two-level atoms and Monte Carlo simulations, we predicted a loading rate and slowing force for a 556-nm magneto-optical trap (MOT) with 1 W of laser power. Our study showed that square-wave modulation can produce similar stimulated forces with improved MOT loading rate of Yb atoms by up to 70%.
Article
Optics
A. Sakaamini, J. -B. Faure, M. A. Khakoo, O. Zatsarinny, K. Bartschat
Summary: The experimental benchmark intensity ratios for electron-impact excitation from the xenon ground state to its lowest five excited states are reported and compared to theoretical predictions and earlier experimental work. The study emphasizes the role of spin-exchange and direct excitation processes in affecting the angular dependence of the results.
Article
Optics
Shamaila Manzoor, Jonathan N. Tinsley, Satvika Bandarupally, Mauro Chiarotti, Nicola Poli
Summary: We present a novel high-power, frequency-stabilized UV laser source at 326.2 nm that resonates with the Cd S-1(0)-P-3(1) narrow intercombination transition. By doubling the frequency of a narrow-linewidth seed laser at 1304.8 nm, we achieve a maximum output power of 1 W at 326.2 nm. The visible light generated by a visible Raman fiber amplifier (VRFA) is then doubled in frequency to 326.2 nm with a maximum conversion efficiency of approximately 40%. The laser source's full characterization and spectroscopy signals of all Cd isotopes spanning a range of over 4 GHz in the UV are shown.
Article
Optics
Yuto Tanabe, Yuma Sakamoto, Takuya Kohno, Daisuke Akamatsu, Feng -Lei Hong
Summary: Precision spectroscopy was used to analyze the molecular iodine lines and establish optical frequency references for laser cooling of Yb atoms. The observed hyperfine transitions of iodine provided new frequency references for research using atomic Yb, with low laser frequency instability and highly accurate hyperfine constants.
Article
Physics, Fluids & Plasmas
S. Palacek, M. Beseda, R. Kalus, M. Benhenni, F. X. Gadea, T. Leininger, M. Yousfi
Summary: A detailed modeling of N-2(+) transport properties in helium gas has been performed based on ab initio collision cross-sections. The study considers a broad range of reduced electric field to provide directly usable data for macroscopic modeling of processes in cold helium plasmas. Various parameters such as N-2(+) mobility, diffusion energies, and dissociation rate constant have been calculated, taking into account the effects of rotational-vibrational excitation and rotational alignment of the N-2(+) molecule. Experimental data and pseudo-experimental data obtained via an inverse-method approach are used for comparison and validation of the theoretical estimates of diffusion energies.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2023)
Article
Physics, Multidisciplinary
Wuhao Chen, Dmitrii Semenok, Xiaoli Huang, Haiyun Shu, Xin Li, Defang Duan, Tian Cui, Artem R. Oganov
Summary: Researchers have discovered two new superconducting phases, SC-I and SC-II, at lower pressures, showing high critical temperatures. The electron-phonon coupling coefficient of these superconducting phases either decreases or increases with pressure, leading to a phase transition that affects superconducting properties.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Vera P. Bader, Jan Langmann, Philipp Gegenwart, Alexander A. Tsirlin
Summary: The crystal structure and thermodynamic properties of Na2SrCo(PO4)(2), a chemical sibling of the triangular quantum spin-liquid candidate Na2BaCo(PO4)(2), have been reported. The structural difference between the two compounds leads to changes in their magnetic properties.
Article
Optics
Yintao Wang, Yajing Li, Jialin Liu, Fangshi Jia, Ran Si, Mingwu Zhang, Liangyu Huang, Bingsheng Tu, Yaming Zou, Baoren Wei, Ke Yao
Summary: In this study, a spectroscopic investigation of the fine-structure splitting of 4p(2) P-3(1) - P-3(0) in Rh13+ was conducted using a compact electron beam ion trap. The transition wavelength was precisely determined using a dedicated internal calibration method, and the uncertainty was significantly improved compared to previous results.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2022)
Article
Physics, Multidisciplinary
Fangyuan Yang, Alexander A. Zibrov, Ruiheng Bai, Takashi Taniguchi, Kenji Watanabe, Michael P. Zaletel, Andrea F. Young
Summary: The experimental technique allows for high sensitivity measurement of the chemical potential in atomically thin layered materials. Results show exceptional agreement with numerical calculations in the N = 0 Landau level, while suggesting the importance of valley anisotropic interactions and possible presence of valley-textured electron solids near odd filling in the N = 1 Landau level.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Fluids & Plasmas
Sasa S. Ivkovic, Nikola Cvetanovic, Bratislav M. Obradovic
Summary: A systematic study was conducted on the influence of gas flow rate on helium dielectric barrier discharge. The study focused on the relationship between gas flow rate and impurity level, as well as the consequent changes in discharge operation. The results showed a non-linear decrease in impurity concentration with increasing gas flow rate. Changes in electrical properties, such as breakdown voltage and current density, were observed with the gas flow. The study also revealed a change in excitation mechanism with variation in gas flow. The decrease in impurities was found to be the main mechanism behind the changes in discharge behavior.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Analytical
Ashraf Asadi Sofilar, Akram Shirdel, Vahab Jafarian, Khosrow Khalifeh
Summary: The study investigated the relationship between the structural features of Mnemiopsin 1 and Mnemiopsin 2 and their activity data. The results showed that they have the same characteristic wavelength, but Mn2 has a significantly higher initial intensity and higher decay rate compared to Mn1. Phylogenetic analysis suggested that a gene modification event may have caused the expansion of the N-terminal side of all photoproteins in Mnemiopsis leidyi. Moreover, in silico studies revealed that the stability and affinity of the substrate for Mn2 were higher than that of Mn1, and the local dynamics of specific loops in Mn2 differed from Mn1, affecting the decay rate of the photoprotein complexes.
Article
Nuclear Science & Technology
A. Dunand, M. Minissale, T. Angot, R. Bisson
Summary: In this study, we used a pure single crystal W(1 1 0) sample to observe the self-trapping of He in the W bulk at a temperature of 300 K and a constant fluence of 2.0 x 1021 He+.m 2. We found that at a He+ kinetic energy of 130 eV and a flux of 0.3 x 1017 He+.m 2.s 1, only a small He desorption peak below 600 K was observed. Increasing the ion flux to 0.7 x 1017 He+.m 2.s 1, we observed the sudden appearance of two desorption peaks at 950 K and 1700 K. For the highest flux studied in this work, 5.0 x 1017 He+.m 2.s 1, an additional desorption peak at 1800 K and a desorption shoulder at 1900 K are observed.
NUCLEAR MATERIALS AND ENERGY
(2023)
Editorial Material
Physics, Multidisciplinary
S. S. Hodgman, A. G. Truscott
Article
Physics, Multidisciplinary
D. Bieganska, M. Pieczarka, E. Estrecho, M. Steger, D. W. Snoke, K. West, L. N. Pfeiffer, M. Syperek, A. G. Truscott, E. A. Ostrovskaya
Summary: By directly measuring the dispersion of collective excitations in a high-density optically trapped exciton-polariton condensate, researchers observed excellent agreement with theoretical predictions for spinor polariton excitations, extracting interaction constants for polaritons of the same and opposite spins and mapping out characteristic spin textures in an interacting spinor condensate of exciton polaritons.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Rui Su, Eliezer Estrecho, Yuqing Huang, Matthias Wurdack, Maciej Pieczarka, Andrew G. Truscott, Timothy C. H. Liew, Elena A. Ostrovskaya, Qihua Xiong
Summary: The text discusses the importance of topology in understanding and designing robust materials, as well as measuring the topological invariants in both Hermitian and non-Hermitian systems. It presents the measurement of a non-Hermitian topological invariant in the momentum-resolved spectrum of exciton polaritons, highlighting the potential for realizing non-Hermitian topological phases in condensed matter systems.
Article
Thermodynamics
Paul J. Burke, Fiona J. Beck, Emma Aisbett, Kenneth G. H. Baldwin, Matthew Stocks, John Pye, Mahesh Venkataraman, Janet Hunt, Xuemei Bai
Summary: The Asia-Pacific region has seen significant growth in energy use and is the largest emitter of greenhouse gases. Australia has been a major player in meeting the region's energy needs, but its exports contribute to a substantial amount of emissions. However, the country has the potential to become a key exporter of zero-carbon energy and products, contingent on cost reductions, growing demand, and the development of clean energy trade frameworks.
Article
Optics
B. M. Henson, K. F. Thomas, Z. Mehdi, T. G. Burnett, J. A. Ross, S. S. Hodgman, A. G. Truscott
Summary: This novel single-shot trap frequency measurement method can determine trap frequency with an accuracy of 39 ppm (16 mHz) in a single experimental realization, improving on the literature by a factor of three. Furthermore, by employing a reconstructive aliasing approach, the method can be applied to trap frequencies more than three times greater than the sampling frequency.
Article
Multidisciplinary Sciences
B. M. Henson, J. A. Ross, K. F. Thomas, C. N. Kuhn, D. K. Shin, S. S. Hodgman, Yong-Hui Zhang, Li-Yan Tang, G. W. F. Drake, A. T. Bondy, A. G. Truscott, K. G. H. Baldwin
Summary: Despite being extensively tested, recent atomic spectroscopy measurements have revealed small discrepancies between experiment and theory in quantum electrodynamics (QED). This study focuses on the tune-out frequency of helium and compares experimental results with new theoretical QED calculations, resolving both QED contributions and retardation corrections.
Correction
Multidisciplinary Sciences
M. Wurdack, E. Estrecho, S. Todd, T. Yun, M. Pieczarka, S. K. Earl, J. A. Davis, C. Schneider, A. G. Truscott, E. A. Ostrovskaya
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
J. A. Ross, P. Deuar, D. K. Shin, K. F. Thomas, B. M. Henson, S. S. Hodgman, A. G. Truscott
Summary: We present observations of the high momentum tail in expanding Bose-Einstein condensates of metastable Helium atoms, which support the idea that the tails originate from the in-situ quantum depletion prior to release. This observation contradicts the hydrodynamic theory and poses challenges in interpreting the stronger depleted tails in the far-field.
SCIENTIFIC REPORTS
(2022)
Article
Physics, Applied
Tinghe Yun, Eliezer Estrecho, Andrew G. Truscott, Elena A. Ostrovskaya, Matthias J. Wurdack
Summary: This study presents a scalable approach to fabricate high-quality planar microcavities with an integrated monolayer WS2 layer-by-layer using PMMA/SiOx as a cavity spacer. The microcavities demonstrated strong light-matter coupling at room temperature, making it an important step towards fabricating wafer-scale and patterned microcavities for engineering the exciton-polariton potential landscape.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Multidisciplinary
M. Wurdack, E. Estrecho, S. Todd, C. Schneider, A. G. Truscott, E. A. Ostrovskaya
Summary: This study demonstrates the trapping and manipulation of polaritons at room temperature in an optical microcavity by enhancing the interactions between materials. It has significant implications for polariton-based optoelectronics in the field of electronics.
PHYSICAL REVIEW LETTERS
(2022)
Article
Optics
Kieran F. Thomas, Bryce M. Henson, Yu Wang, Robert J. Lewis-Swan, Karen V. Kheruntsyan, Sean S. Hodgman, Andrew G. Truscott
Summary: We present an experimentally viable approach to demonstrate quantum non-locality in a matter-wave system using a Rarity-Tapster interferometer. The suitability of this method is quantified through theoretical discussion and experimental results. As a proof of concept, we demonstrate an interferometric visibility and Bell parameter between atoms separated by a certain distance, which is important for studying motion degrees of freedom and quantum effects in a gravitationally sensitive system.
EUROPEAN PHYSICAL JOURNAL D
(2022)
Article
Multidisciplinary Sciences
M. Wurdack, T. Yun, M. Katzer, A. G. Truscott, A. Knorr, M. Selig, E. A. Ostrovskaya, E. Estrecho
Summary: The authors demonstrate dissipative coupling between excitons and photons in optical microcavities, resulting in the creation of polaritons with a negative effective mass. This study introduces the concept of non-Hermitian dispersion engineering for exciton polaritons and shows direct measurements of anomalous dispersion in atomically thin crystals embedded in planar microcavities.
NATURE COMMUNICATIONS
(2023)
Article
Optics
Liam A. Fuderer, Liangwei Wang, James S. Stuart, Morgan P. Hedges, Andrew G. Truscott, Sean S. Hodgman
Summary: This article presents a simple design for constructing an equivalent in-fibre Fabry-Perot interferometer (FPI) by splicing together two ports of a 99:1 in-fibre beamsplitter to form a fibre ring resonator (FRR). By heating a length of the fibre, the resonant frequency of the FPI can be scanned in a controllable manner primarily by changing the refractive index of the fibre. This design is suitable for applications where a standard Fabry-Perot cavity is used, particularly for laser mode monitoring.
Article
Materials Science, Multidisciplinary
M. Pieczarka, O. Bleu, E. Estrecho, M. Wurdack, M. Steger, D. W. Snoke, K. West, L. N. Pfeiffer, A. G. Truscott, E. A. Ostrovskaya, J. Levinsen, M. M. Parish
Summary: The authors develop a generalized version of Bogoliubov theory for a driven-dissipative exciton-polariton condensate with a large incoherent uncondensed component. They argue that the presence of an excitonic reservoir modifies the energy and amplitudes of the Bogoliubov quasiparticle excitations. The authors support their theoretical findings with experimental results.
