Article
Physics, Multidisciplinary
Xiang-Chuan Yan, Da-Li Sun, Lu Wang, Jing Min, Shi-Guo Peng, Kai-Jun Jiang
Summary: The experimental production of degenerate Fermi gases of Li-6 atoms in an optical dipole trap was successfully achieved, where atomic temperature was decreased using gray-molasses technique and evaporative cooling. The anisotropic expansion of the degenerate atom cloud in the strongly interacting regime was also observed during the study.
CHINESE PHYSICS LETTERS
(2021)
Article
Physics, Multidisciplinary
Jing Xu, Wen-Liang Liu, Ning-Xuan Zheng, Yu-Qing Li, Ji-Zhou Wu, Peng Li, Yong-Ming Fu, Jie Ma, Lian-Tuan Xiao, Suo-Tang Jia
Summary: This research investigates the loading of ultracold sodium atoms in an optical dipole trap using two beams from a high power fiber laser. The study examines the effects of optical trap light power on atomic number, temperature, and phase space density, proposing a simple theory that aligns well with experimental results. Optimal loading conditions were found with each beam having a power of 9 W from the fiber laser, contributing to a deeper understanding of the loading process and laying the groundwork for sodium Bose-Einstein condensation generation with an optical dipole trap.
Article
Optics
Guosheng Feng, Zhixing Qiao, Tao Yin, Jizhou Wu, Hui Zhang
Summary: We conducted a comprehensive study on the optimized loading of ultracold Cs atoms in a magnetic levitated crossed dipole trap. The effects of the dipole laser's opening time and power intensity on the loading efficiency were analyzed. Experimental measurements showed that the number of atoms can be significantly increased through the pre-loading process.
Article
Optics
Ningxuan Zheng, Wenliang Liu, Jizhou Wu, Yuqing Li, Vladimir Sovkov, Jie Ma
Summary: This article reports on experimental research of parametric resonances in an optical dipole trap. By modulating the trapping potential, the dependence of atomic loss on the frequency of the parametric modulations has been measured. The resonance loss spectra and the evolution of atom populations have been analyzed and compared under three modulation waveforms.
Article
Optics
Wenliang Liu, Ningxuan Zheng, Xiaofeng Wang, Jing Xu, Yuqing Li, Vladimir B. Sovkov, Peng Li, Yongming Fu, Jizhou Wu, Jie Ma, Liantuan Xiao, Suotang Jia
Summary: The experiment presents a method for quickly producing Bose-Einstein condensates (BECs) of Na-23 atoms, creating a pure F = 1 BEC of approximately 1.1 x 10^5 sodium atoms with a fast forced evaporation process. The system reliably generates the condensate at a rate exceeding 10^5 atoms every approximately 8 seconds. Additionally, the lifetimes of the mixed F = 1 condensate and the spin components (m ( F ) = 0, m ( F ) = +1) were compared.
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Jiandong Bai, Yang Liu, Shaofeng Fan, Shuo Liu, Wenyuan Liu, Qi Jie, Yijun Li, Junmin Wang
Summary: By studying the magic-wavelength optical dipole trap (ODT) for pre-cooled atoms, the differential light shift between two atomic states can be eliminated, resulting in the same transition frequency as atoms in free space. This has great significance for improving experimental repetition rate and reducing atomic decoherence in cold atom physics, quantum optics, and precision measurement. In this study, we calculate the dynamic polarizabilities of cesium 6S ground state and 7P excited state using the multi-level model for ODT, with laser wavelength ranging from 1200 to 2000 nm. The magic wavelengths for linearly and circularly polarized laser beams at the intersection of the dynamic polarizabilities of the two atomic states are obtained. Furthermore, we analyze the robustness of the magic trapping conditions and the feasibility of experimental operation near the telecom C-band wavelength.
RESULTS IN PHYSICS
(2023)
Article
Biotechnology & Applied Microbiology
Rongxin Zhang, Te Bu, Ruidan Cao, Zhelong Li, Chen Wang, Bing Huang, Mengying Wei, Lijun Yuan, Guodong Yang
Summary: In this study, the researchers increased exosome production by reducing the expression of genes inhibiting exosome biogenesis and supplementing the culture medium with red cell membrane components. The combination of these strategies significantly increased exosome yield and showed therapeutic effects in treating liver steatosis and atherosclerosis in mice.
JOURNAL OF NANOBIOTECHNOLOGY
(2022)
Article
Physics, Multidisciplinary
T. K. Langin, D. DeMille
Summary: Recent experiments have shown that it is possible to directly cool and trap diatomic and triatomic molecules in magneto-optical traps (MOTs). However, the density achieved in molecular MOTs is still 10(-5) times smaller than in atomic MOTs. The main limitations are the inefficiencies in slowing down molecules to capture velocities and the density limits within the MOT due to sub-Doppler heating. Driving 'Type-II' optical cycling transitions that involve dark states in Zeeman sublevels is necessary to avoid rotational branching. Simulations have been presented to address these limitations and pave the way for evaporative cooling of molecules to quantum degeneracy.
NEW JOURNAL OF PHYSICS
(2023)
Article
Physics, Multidisciplinary
Miao Wang, Zheng Chen, Yao Huang, Hua Guan, Ke-Lin Gao
Summary: Micromotion induced by the radio-frequency field plays a significant role in the systematic frequency shifts of optical frequency standards. Optically trapping ions in a dipole trap composed of a high-power laser field has the potential to eliminate micromotion effectively, as demonstrated in the setup using a 532 nm laser at 10 W power aiming to trap a single Ca-40(+) ion. The dipole laser's beam waist of several microns provides a strong dipole potential for the optical trapping of a single Ca-40(+) ion.
Article
Chemistry, Physical
Hela Ladjimi, Wissem Zrafi, Mohamed Farjallah, Mohamed Bejaoui, Hamid Berriche
Summary: The BeCs+ system is a potential candidate for the realization of cold or ultra-cold molecular ion species. The spectroscopic and electronic structure of BeCs+ is theoretically investigated, and various properties such as potential energy curves, vibrational levels, and dipole moments are reported. The elastic scattering properties and isotopic effects on cold energy collisions are also examined. The system shows potential for direct laser cooling.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Green & Sustainable Science & Technology
Nur Sadrina Brahim, Roshan Thotagamuge, Muhammad Raziq Rahimi Kooh, Chee Ming Lim, Mohammad Ammar Syaahiran, Anwar Usman, Nurulizzatul Ningsheh M. Shahri, Yuan-Fong Chou Chau, Chung-Ting Chou Chao, Hai-Pang Chiang, Abdul Hanif Mahadi
Summary: In this study, PbS-loaded ZnO and CrZnO nanocomposites were synthesized using a sol-gel method and used for CO gas sensor fabrication. The experimental results showed that PbS-CrZnO exhibited better sensitivity at 300 ppmv. The improvement in gas sensing performance may be attributed to the heterojunction effect.
Article
Multidisciplinary Sciences
Ahmed Y. Elsharabasy, Mohamed H. Bakr, M. Jamal Deen
Summary: A novel, polarization-independent, wide-angle reception Chand-Bali nano-antenna is proposed, which achieves resonance for both linear polarizations of the incident radiation. By integrating with MIM diodes, the antenna enables efficient infrared energy harvesting.
SCIENTIFIC REPORTS
(2023)
Article
Physics, Multidisciplinary
Kavish Bhardwaj, S. P. Ram, S. Singh, V. B. Tiwari, S. R. Mishra
Summary: This work investigates the effect of AC-Stark shift of atomic energy levels in an optical dipole trap on in situ absorption imaging of trapped atoms. The estimated number of atoms trapped in the ODT is found to be higher at higher ODT beam power, showing qualitative agreement with larger trap depth at higher beam power. This research can be particularly useful in estimating the in situ loss rate of atoms from the trap during evaporative cooling of the trapped atom cloud.
Article
Engineering, Electrical & Electronic
Xinkai Fan, Emanuele Crisostomi, Dimitri Thomopulos, Baohui Zhang, Robert Shorten, Songhao Yang
Summary: This paper presents a decentralized power sharing solution for wind farms, requiring only one-way communications and no exchange of information among turbines. By utilizing AIMD algorithms, it balances power sharing among wind turbines with different mechanical characteristics under various working conditions.
IEEE TRANSACTIONS ON POWER SYSTEMS
(2021)
Article
Physics, Applied
Ningxuan Zheng, Wenliang Liu, Hui Tang, Yuqing Li, Peng Li, Yongming Fu, Jizhou Wu, Jie Ma, Wenxian Zhang, Liantuan Xiao, Suotang Jia
Summary: Experimental and theoretical investigation was conducted on using spin current in a sodium spinor Bose-Einstein condensate to measure the oscillation frequency in a dipole trap. Results showed that the method is efficient and has potential for application in other optical-trappable quantum gases.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Particles & Fields
Angela D. V. Di Virgilio, Nicolo Beverini, Giorgio Carelli, Donatella Ciampini, Francesco Fuso, Enrico Maccioni
EUROPEAN PHYSICAL JOURNAL C
(2019)
Article
Physics, Particles & Fields
Angela D. V. Di Virgilio, Nicolo Beverini, Giorgio Carelli, Donatella Ciampini, Francesco Fuso, Umberto Giacomelli, Enrico Maccioni, Antonello Ortolan
EUROPEAN PHYSICAL JOURNAL C
(2020)
Article
Optics
I Manai, A. Molineri, C. Frejaville, C. Duval, P. Bataille, R. Journet, F. Wiotte, B. Laburthe-Tolra, E. Marechal, M. Cheneau, M. Robert-de-Saint-Vincent
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
(2020)
Article
Physics, Multidisciplinary
Lucas Gabardos, Bihui Zhu, Steven Lepoutre, Ana Maria Rey, Bruno Laburthe-Tolra, Laurent Vernac
PHYSICAL REVIEW LETTERS
(2020)
Editorial Material
Multidisciplinary Sciences
Bruno Laburthe-Tolra
Article
Optics
Peter Seigo Kincaid, Alessandro Porcelli, Antonio Alvaro Ranha Neves, Ennio Arimondo, Andrea Camposeo, Dario Pisignano, Donatella Ciampini
Summary: This paper introduces a rigorous treatment of the electromagnetic forces based on the Lorenz-Mie theory for predicting optical forces on microspheres inside hollow core photonic crystal fibers. The method is more practicable and not limited by system size parameters compared to ray optics models.
Article
Multidisciplinary Sciences
Chun-Chia Chen, Rodrigo Gonzalez Escudero, Jiri Minar, Benjamin Pasquiou, Shayne Bennetts, Florian Schreck
Summary: This study demonstrates the continuous existence of Bose-Einstein condensates by continuously amplifying atoms from a thermal bath. By steadily replenishing the bath and increasing the phase-space density, this experiment provides a missing piece for the construction of continuous coherent-matter-wave devices.
Article
Physics, Multidisciplinary
Youssef Aziz Alaoui, Bihui Zhu, Sean Robert Muleady, William Dubosclard, Tommaso Roscilde, Ana Maria Rey, Bruno Laburthe-Tolra, Laurent Vernac
Summary: In this study, collective spin measurements are performed to investigate the development of two-body correlations between 104 spin s = 3 chromium atoms pinned in a 3D optical lattice. The interactions between spins are characterized by long range and anisotropic dipolar interactions. The fluctuations of total magnetization are measured to estimate the growth of connected pairwise correlations associated with magnetization, and the quantum nature of these correlations is assessed through comparisons with analytical expansions and numerical simulations.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Particles & Fields
A. D. V. Di Virgilio, G. Terreni, A. Basti, N. Beverini, G. Carelli, D. Ciampini, F. Fuso, E. Maccioni, P. Marsili, J. Kodet, K. U. Schreiber
Summary: The absolute measurement of the Earth's angular rotation rate is important for studying the effects of General Relativity and Lorentz violation in the gravity sector, as well as providing information about the fast variation of the Earth's rotation rate. High sensitivity Ring Laser Gyroscopes (RLG) are currently the most promising technique for achieving this measurement task.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Optics
A. Litvinov, P. Bataille, E. Marechal, P. Pedri, O. Gorceix, M. Robert-de-Saint-Vincent, B. Laburthe-Tolra
Summary: This experimental method proposes using absorption imaging to measure the size and local density of a cloud of atoms, even when its smallest dimension is smaller than the imaging system's resolution. By making assumptions about the cloud shape and providing additional information, more accurate results can be obtained compared to standard analysis. The method is suitable for high-density clouds and can recover an undistorted density profile.
Article
Physics, Multidisciplinary
Rodrigo Gonzalez Escudero, Chun-Chia Chen, Shayne Bennetts, Benjamin Pasquiou, Florian Schreck
Summary: A steady-stale magneto-optical trap (MOT) of fermionic strontium atoms operating on the 7.5-kHz-wide S-1(0) - P-3(1) transition is demonstrated. The MOT contains 8.4 x 10(7) atoms, a loading rate of 1.3 x 10(7) atoms/s, and an average temperature of 12 mu K, making it suitable as a source for continuous-wave superradiant lasers operating on strontium's clock transition. This development paves the way for continuous active optical clocks.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Optics
P. Bataille, A. Litvinov, I Manai, J. Huckans, F. Wiotte, A. Kaladjian, O. Gorceix, E. Marechal, B. Laburthe-Tolra, M. Robert-de-Saint-Vincent
