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Optimal preparation of Bose and Fermi atomic gas mixtures of ^(87)Rb and ^(40)K in a crossed optical dipole trap

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Chinese Physics B 2024年第6期33卷 356-361页

作者：丁培波单标赵宇航杨雅婧陈良超孟增明王鹏军黄良辉 State Key Laboratory of Quantum optics and Quantum optics Devices Institute of Opto-electronicsCollaborative Innovation Center of Extreme OpticsShanxi UniversityTaiyuan 030006China Hefei National Laboratory Hefei 230000China

We report on the optimal production of the Bose and Fermi mixtures with ^(87) Rb and ^(40)K in a crossed optical dipole trap(ODT).We measure the atomic number and lifetime of the mixtures in combination of the spin state |F=9/2,m_F=9/2) of^(40)K and |1,1>of ^(87) Rb in the ODT,which is larger and longer compared with the combination of the spin state 19/2,9/2) of^(40)K and 12,2) of ^(87)Rb in the ODT.We observe the atomic numbers of ^(87)Rb and ^(40)K shown in each stage of the sympathetic cooling process while gradually reducing the depth of the optical trap.By optimizing the relative loading time of atomic mixtures in the MOT,we obtain the large atomic number of ^(40)K(~6 ×10^(6)) or the mixtures of atoms with an equal number(~1.6 × 10^(6)) at the end of evaporative cooling in the ODT.We experimentally investigate the evaporative cooling in an enlarged volume of the ODT via adding a third laser beam to the crossed ODT and found that more atoms(8 × 10^(6)) and higher degeneracy(T/T_(F)=0.25) of Fermi gases are obtained.The ultracold atomic gas mixtures pave the way to explore phenomena such as few-body collisions and the Bose-Fermi Hubbard model,as well as for creating ground-state molecules of ^(87)Rb^(40)K.

关键词： optical dipole trap Bose and Fermi gas mixtures atomic lifetime

Distribution of polarization squeezed light through a 20 km fiber channel

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Science China(Information Sciences) 2024年第5期67卷 343-344页

作者： Chao LI Siyu REN Yanru YAN Yalin LI Meihong WANG Xiaolong SU State Key Laboratory of Quantum optics and Quantum optics Devices Institute of Opto-Electronics Shanxi University Collaborative Innovation Center of Extreme optics Shanxi University

Polarization squeezed light plays a key role in quantum memory by transferring quantum information between atoms and photons [1], and has potential applications in quantum precision measurement [2]. For polarization squeezed light, the quantum variance of at least one Stokes operator is smaller than that of the coherent state.Compared with the quadrature squeezed state, polarization squeezed light has the following advantages: one is that it is a bright beam, and the other is that it can be measured directly without using a local oscillator.

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Gigahertz frequency hopping in an optical phase-locked loop for Raman lasers

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Chinese Physics B 2024年第2期33卷 60-65页

作者：毛德凯税鸿冕殷国玲彭鹏王春唯周小计 State Key Laboratory of Advanced Optical Communication System and Network School of ElectronicsPeking UniversityBeijing 100871China institute of Carbon-based Thin Film electronics Peking UniversityTaiyuan 030012China State Key Laboratory of Quantum optics and Quantum optics Devices Institute of Opto-ElectronicsShanxi UniversityTaiyuan 030006China institute of Advanced Functional Materials and Devices Shanxi UniversityTaiyuan 030031China

Raman lasers are essential in atomic physics,and the development of portable devices has posed requirements for time-division multiplexing of Raman lasers.We demonstrate an innovative gigahertz frequency hopping approach of a slave Raman laser within an optical phase-locked loop(OPLL),which finds practical application in an atomic gravimeter,where the OPLL frequently switches between near-resonance lasers and significantly detuned Raman lasers.The method merges the advantages of rapid and extensive frequency hopping with the OPLL’s inherent low phase noise,and exhibits a versatile range of applications in compact laser systems,promising advancements in portable instruments.

关键词： Raman lasers optical phase-locked loop frequency hopping

A muon high-resolution pseudorange measurement method: Application to muon navigation in confined spaces

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Chinese Journal of Aeronautics 2024年第4期37卷 391-404页

作者： Haoyang LI Chunxi ZHANG Xingming FAN Longjie TIAN Tianqi LI Yang PANG Yanqiang YANG Institute of Optics and Electronics School of Instrumentation Science and Optoelectronics EngineeringBeihang UniversityBeijing 100191China institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China

Confined spaces such as polar regions, deep earth and deep ocean are crucial navigation scenarios where traditional navigation techniques have difficulty in obtaining external signals for positioning. The cosmic ray muons, which carry the spatial and energetic information, are easy to penetrate these confined spaces. Therefore, the unique muon characteristic provides a new perspective to estimate detector position, which can be considered using in confined spaces navigation.In this paper, a well-developed theory of muon navigation is established by combining a muon pseudorange measurement method. Moreover, an Equivalent Velocity Calculation Model(EVCM)and a Muon Sequence Matching Technology(MSMT) are proposed. The first model corrects flight pseudorange error caused by the relativistic energy loss and the second technology compensates the random error in pseudorange measurement. Further, a series of simulations are performed to analyze the muon events number which can be received by detector in different scenarios with the variations of zenith angle, detector area, varied detector plates gap, and muon flight distance.Meanwhile, the simulation results demonstrate that the muon navigation update rate every 10 minutes can reach 5.989 in confined spaces at 100 m, and further pseudorange error analysis indicates that the meter-level positioning accuracy can be acquired. Finally, we construct a muon coincidence measurement scheme and verify that the laws of the muon positioning system for high-energy muons are consistent with the simulation results.

关键词： Muon navigation Cosmic ray muons Muon detection technology Muon transmission technology Pseudorange measurement

Boosting MA-based two-dimensional Ruddlesden-Popper perovskite solar cells by incorporating a binary spacer

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Journal of Energy Chemistry 2024年第8期95卷 348-356页

作者： Xue Dong Yinhao Tang Yiqun Li Xin Li Yuzhen Zhao Wenqi Song Fangmin Wang Shudong Xu Yipeng Zhou Chenxin Ran Zongcheng Miao Lin Song Zhongbin Wu Xi'an Key Laboratory of Advanced Photo-electronics Materials and Energy Conversion Device Technological Institute of Materials & Energy Science (TIMES) Xijing University Frontiers Science Center for Flexible electronics Xi'an Institute of Flexible Electronics (IFE) Northwestern Polytechnical University School of Artificial Intelligence optics and electronics (iOPEN) Northwestern Polytechnical University

Two-dimensional Ruddlesden-Popper（2DRP） perovskite exhibits excellent stability in perovskite solar cells（PSCs） due to introducing hydrophobic long-chain organic spacers.However,the poor charge transporting property of bulky organic cation spacers limits the performance of 2DRP PSCs.Inspired by the Asite cation alloying strategy in 3D perovskites,2DRP perovskites with a binary spacer can promote charge transporting compared to the unary spacer counterparts.Herein,the superior MA-based 2DRP perovskite films with a binary spacer,including 3-guanidinopropanoic acid（GPA） and 4-fluorophenethylamine（FPEA） are realized.These films(GPA0.85FPEA0.15)2MA4Pb5I16show good morphology,large grain size,decreased trap state density,and preferential orientation of the as-prepared film.Accordingly,the present 2DRP-based PSC with the binary spacer achieves a remarkable efficiency of 18.37% with a VOCof1.15 V,a JSCof 20.13 mA cm-2,and an FF of 79.23%.To our knowledge,the PCE value should be the highest for binary spacer MA-based 2DRP（n ≤ 5） PSCs to date.Importantly,owing to the hydrophobic fluorine group of FPEA and the enhanced interlayer interaction by FPEA,the unencapsulated 2DRP PSCs based on binary spacers exhibit much excellent humidity stability and thermal stability than the unary spacer counterparts.

关键词： Binary spacers Perovskite solar cells Stability Two-dimensional Ruddlesden-Popper perovskite

Hybrid bonding of GaAs and Si wafers at low temperature by Ar plasma activation

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Journal of Semiconductors 2024年第4期45卷 69-75页

作者： Rui Huang Zhiyong Wang Kai Wu Hao Xu Qing Wang Yecai Guo School of Electronic and Information Engineering Wuxi UniversityWuxi 214105China institute of Advanced Technology on Semiconductor optics&electronics Institute of Laser EngineeringBeijing University of TechnologyBeijing 100124China

High-quality bonding of 4-inch GaAs and Si is achieved using plasma-activated bonding technology.The influence of Ar plasma activation on surface morphology is discussed.When the annealing temperature is 300℃,the bonding strength reaches a maximum of 6.2 MPa.In addition,a thermal stress model for GaAs/Si wafers is established based on finite element analysis to obtain the distribution of equivalent stress and deformation variables at different temperatures.The shape varia-tion of the wafer is directly proportional to the annealing temperature.At an annealing temperature of 400℃,the maximum protrusion of 4 inches GaAs/Si wafers is 3.6 mm.The interface of GaAs/Si wafers is observed to be dense and defect-free using a transmission electron microscope.The characterization of interface elements by X-ray energy dispersion spectroscopy indi-cates that the elements at the interface undergo mutual diffusion,which is beneficial for improving the bonding strength of the interface.There is an amorphous transition layer with a thickness of about 5 nm at the bonding interface.The preparation of Si-based GaAs heterojunctions can enrich the types of materials required for the development of integrated circuits,improve the performance of materials and devices,and promote the development of microelectronics technology.

关键词： plasma-activated bonding bonding strength thermal stress model mutual diffusion

Light People:Professor Laura Na Liu

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Light(Science & Applications) 2024年第2期13卷 184-189页

作者： Hui Wang Cun Yu Changchun institute of optics Fine Mechanics and PhysicsChinese Academy of Sciences130033ChangchunChina

Editorial The DNA nanotechnology outlines a new chapter in biological sciences,opening a new era of scientific and technological advancements.A pioneer of DNA nanotechnology,Professor Liu from the University of Stuttgart in Germany,our latest Light People,has been working at the interface,where nanophotonics meets biology and chemistry.On the path of scientific explorations.

关键词： chemistry. advancement pioneer

Efficient micrometer-scale thick-film perovskite solar cells with superior stability

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Rare Metals 2024年第4期43卷 1647-1657页

作者： Jian-Fei Hu Gang Chen Shun-Zhang Yu Yue-Xin Lin Kai-Yu Wang Zong-Wei Li Guo-Dong Zhang Teng-Fei Pan Ya-Jing Li Ming-Jie Li Ying-Dong Xia Yi-Fan Lv Yong-Hua Chen Key Laboratory of Flexible electronics (KLoFE) and institute of Advanced Materials (IAM) School of Flexible Electronics (Future Technologies)Nanjing Tech University (NanjingTech) Department of Applied Physics The Hong Kong Polytechnic University Shenzhen Research institute The Hong Kong Polytechnic University optics Valley Laboratory

It is essential to enhance the thickness of the absorber layer for perovskite solar cells(PSCs) to improve device performance and reduce industry refinement.However,thick perovskite films(> 1 μm) are difficult to be fabricated by employing traditional solvents,such as N,N-dimethylformamide(DMF),dimethyl sulfoxide(DMSO).Besides,it is a challenge to fabricate thick-film perovskite owing to the deteriorated surface morphology and serious defect density.Herein,a simple method was reported to deposit uniform pinhole-free perovskite films with a thickness of more than 2 μm utilizing the methylamine acetate(MAAc) ionic liquid as the solvent.Combined with methylammonium chloride(MACl) as an additive,thick-film perovskite with～ 2μm in grain size and few grain boundaries(GBs) was prepared,which dramatically improved the perovskite crystal quality and enhanced carrier transport performance.The final PSCs exhibited a power conversion efficiency(PCE) of 20.16%.The device showed improved stability with 95% of its initial efficiency in a nitrogen environment over 5000 h.This work provides an alternative strategy to produce extremely efficient and stable thick-film PSCs.It can be believed that this device has great potential in the application of large areas and laminated PSCs.

关键词： Perovskite solar cells Thick-film Stability Ionic liquid

Efficient loading of cesium atoms in a magnetic levitated dimple trap

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Chinese Physics B 2024年第2期33卷 324-328页

作者：张国庆冯国胜李玉清武寄洲马杰 State Key Laboratory of Quantum optics and Quantum optics Devices Institute of Laser SpectroscopyCollege of Physics and Electronics EngineeringShanxi UniversityTaiyuan 030006China Department of Magnetic Resonance Imaging The First Hospital of Shanxi Medical UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme optics Shanxi UniversityTaiyuan 030006China

We report a detailed study of magnetically levitated loading of ultracold ^(133)Cs atoms in a dimple trap.The atomic sample was produced in a combined red-detuned optical dipole trap and dimple trap formed by two small waist beams crossing a horizontal plane.The magnetic levitation for the ^(133)Cs atoms forms an effective potential for a large number of atoms in a high spatial density.Dependence of the number of atoms loaded and trapped in the dimple trap on the magnetic field gradient and bias field is in good agreement with the theoretical analysis.This method has been widely used to obtain the Bose–Einstein condensation atoms for many atomic species.

关键词： ultracold atom magnetic levitation dimple trap