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Surface defect gap solitons in two-dimensional optical lattices
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作者 孟云吉 刘友文 唐宇煌 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第7期314-319,共6页
We investigate the existence and stability of surface defect gap solitons at an interface between a defect in a two-dimensional optical lattice and a uniform saturable Kerr nonlinear medium. The surface defect embedde... We investigate the existence and stability of surface defect gap solitons at an interface between a defect in a two-dimensional optical lattice and a uniform saturable Kerr nonlinear medium. The surface defect embedded in the two-dimensional optical lattice gives rise to some unique properties. It is interestingly found that for the negative defect, stable surface defect gap solitons can exist both in the semi-infinite gap and in the first gap. The deeper the negative defect, the narrower the stable region in the semi-infinite gap will be. For a positive defect, the surface defect gap solitons exist only in the semi-infinite gap and the stable region localizes in a low power region. 展开更多
关键词 surface defect gap soliton optical lattice saturable Kerr nonlinear media
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Quantum droplets in two-dimensional optical lattices 被引量:3
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作者 Yi-Yin Zheng Shan-Tong Chen +4 位作者 Zhi-Peng Huang Shi-Xuan Dai Bin Liu Yong-Yao Li Shu-Rong Wang 《Frontiers of physics》 SCIE CSCD 2021年第2期13-22,共10页
We study the stability of zero-vorticity and vortex lattice quantum droplets(LQDs),which are de-scribed by a two-dimensional(2D)Gross-Pitaevskii(GP)equation with a periodic potential and Lee-Huang-Yang(LHY)term.The LQ... We study the stability of zero-vorticity and vortex lattice quantum droplets(LQDs),which are de-scribed by a two-dimensional(2D)Gross-Pitaevskii(GP)equation with a periodic potential and Lee-Huang-Yang(LHY)term.The LQDs are divided in two types:onsite-centered and offsite-centered LQDs,the centers of which are located at the minimum and the maximum of the potential,respec-tively.The stability areas of these two types of LQDs with diferent number of sites for zero-vorticity and vorticity with S=1 are given.We found that the μ-N relationship of the stable LQDs with a fixed number of sites can violate the Vakhitov-Kolokolov(VK)criterion,which is a necessary stability condition for nonlinear modes with an attractive interaction.Moreover,the μ-N relationship shows that two types of vortex LQDs with the same number of sites are degenerated,while the zero-vorticity LQDs are not degenerated.It is worth mentioning that the offsite-centered LQDs with zero-vorticity and vortex LQDs with S=1 are heterogeneous. 展开更多
关键词 lattice quantum droplets optical lattices VORTEX
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Fulde-Ferrell-Larkin-Ovchinnikov states in equally populated Fermi gases in a two-dimensional moving optical lattice
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作者 Jin-Ge Chen Yue-Ran Shi +2 位作者 Ren Zhang Kui-Yi Gao Wei Zhang 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第10期143-148,共6页
We study the possibility of stabilizing a Fulde-Ferrell-Larkin-Ovchinnikov(FFLO)state in an equally populated two-component Fermi gas trapped in a moving two-dimensional optical lattice.For a system with nearly half f... We study the possibility of stabilizing a Fulde-Ferrell-Larkin-Ovchinnikov(FFLO)state in an equally populated two-component Fermi gas trapped in a moving two-dimensional optical lattice.For a system with nearly half filling,we find that a finite pairing momentum perpendicular to the moving direction can be spontaneously induced for a proper choice of lattice velocity.As a result,the total pairing momentum is tilted towards the nesting vector to take advantage of the significant enhancement of the density of states. 展开更多
关键词 FFLO state optical lattice ultracold Fermi gas SUPERFLUID
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A Yb optical clock with a lattice power enhancement cavity
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作者 王春云 姚远 +3 位作者 师浩森 于洪浮 马龙生 蒋燕义 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第3期70-74,共5页
We construct a power enhancement cavity to form an optical lattice in an ytterbium optical clock.It is demonstrated that the intra-cavity lattice power can be increased by about 45 times,and the trap depth can be as l... We construct a power enhancement cavity to form an optical lattice in an ytterbium optical clock.It is demonstrated that the intra-cavity lattice power can be increased by about 45 times,and the trap depth can be as large as 1400Er when laser light with a power of only 0.6 W incident to the lattice cavity.Such high trap depths are the key to accurate evaluation of the lattice-induced light shift with an uncertainty down to~1×10-18.By probing the ytterbium atoms trapped in the power-enhanced optical lattice,we obtain a 4.3 Hz-linewidth Rabi spectrum,which is then used to feedback to the clock laser for the close loop operation of the optical lattice clock.We evaluate the density shift of the Yb optical lattice clock based on interleaving measurements,which is-0.46(62)mHz.This result is smaller compared to the density shift of our first Yb optical clock without lattice power enhancement cavity mainly due to a larger lattice diameter of 344μm. 展开更多
关键词 optical atomic clock optical lattice optical cavity Stark shift
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Nonlinear localization of ultracold atomic Fermi gas in moiré optical lattices
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作者 Xiuye Liu Jianhua Zeng 《Advanced Photonics Nexus》 2024年第3期50-57,共8页
Moirésuperlattices,a twisted functional structure crossing the periodic and nonperiodic potentials,have recently attracted great interest in multidisciplinary fields,including optics and ultracold atoms,because o... Moirésuperlattices,a twisted functional structure crossing the periodic and nonperiodic potentials,have recently attracted great interest in multidisciplinary fields,including optics and ultracold atoms,because of their unique band structures,physical properties,and potential implications.Driven by recent experiments on quantum phenomena of bosonic gases,the atomic Bose–Einstein condensates in moiréoptical lattices,by which other quantum gases such as ultracold fermionic atoms are trapped,could be readily achieved in ultracold atom laboratories,whereas the associated nonlinear localization mechanism remains unexploited.Here,we report the nonlinear localization theory of ultracold atomic Fermi gases in two-dimensional moiréoptical lattices.The linear Bloch-wave spectrum of such a twisted structure exhibits rich nontrivial flat bands,which are separated by different finite bandgaps wherein the existence,properties,and dynamics of localized superfluid Fermi gas structures of two types,gap solitons and gap vortices(topological modes)with vortex charge S¼1,are studied numerically.Our results demonstrate the wide stability regions and robustness of these localized structures,opening up a new avenue for studying soliton physics and moiréphysics in ultracold atoms beyond bosonic gases. 展开更多
关键词 moiréoptical lattices gap solitons ultracold Fermi gases density-functional equation.
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Strontium optical lattice clock at the National Time Service Center 被引量:11
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作者 王叶兵 尹默娟 +5 位作者 任洁 徐琴芳 卢本全 韩建新 郭阳 常宏 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第2期204-209,共6页
We report the 87Sr optical lattice clock developed at the National Time Service Center. We achieved a closed-loop operation of the optical lattice clock based on 87Sr atoms. The linewidth of the spin-polarized clock p... We report the 87Sr optical lattice clock developed at the National Time Service Center. We achieved a closed-loop operation of the optical lattice clock based on 87Sr atoms. The linewidth of the spin-polarized clock peak is 3.9 Hz with a clock laser pulse length of 300 ms, which corresponds to a Fourier-limited linewidth of 3 Hz. The fitting of the in-loop error signal data shows that the instability is approximately 5 × 10 15τ-1/2, affected primarily by the white noise. The fractional frequency difference averages down to 5.7 × 10 ^-17 for an averaging time of 3000 s. 展开更多
关键词 optical clock optical lattice strontium atoms STABILITY
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A transportable optical lattice clock at the National Time Service Center 被引量:7
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作者 De-Huan Kong Zhi-Hui Wang +4 位作者 Feng Guo Qiang Zhang Xiao-Tong Lu Ye-Bing Wang Hong Chang 《Chinese Physics B》 SCIE EI CAS CSCD 2020年第7期92-98,共7页
We report a transportable one-dimensional optical lattice clock based on 87Sr at the National Time Service Center.The transportable apparatus consists of a compact vacuum system and compact optical subsystems.The vacu... We report a transportable one-dimensional optical lattice clock based on 87Sr at the National Time Service Center.The transportable apparatus consists of a compact vacuum system and compact optical subsystems.The vacuum system with a size of 90 cm×20 cm×42 cm and the beam distributors are assembled on a double-layer optical breadboard.The modularized optical subsystems are integrated on independent optical breadboards.By using a 230 ms clock laser pulse,spin-polarized spectroscopy with a linewidth of 4.8 Hz is obtained which is close to the 3.9 Hz Fourier-limit linewidth.The time interleaved self-comparison frequency instability is determined to be 6.3 × 10^-17 at an averaging time of 2000 s. 展开更多
关键词 optical lattice clock strontium atoms spin-polarized spectra INSTABILITY
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Clock-transition spectrum of ^(171)Yb atoms in a one-dimensional optical lattice 被引量:2
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作者 陈宁 周敏 +8 位作者 陈海琴 方苏 黄良玉 张晓航 高琪 蒋燕义 毕志毅 马龙生 徐信业 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第9期342-347,共6页
An optical atomic clock with 171yb atoms is devised and tested. By using a two-stage Doppler cooling technique, the 171Yb atoms are cooled down to a temperature of 6 ± 3 μK, which is close to the Doppler limit. ... An optical atomic clock with 171yb atoms is devised and tested. By using a two-stage Doppler cooling technique, the 171Yb atoms are cooled down to a temperature of 6 ± 3 μK, which is close to the Doppler limit. Then, the cold 171Yb atoms are loaded into a one-dimensional optical lattice with a wavelength of 759 nm in the Lamb-Dicke regime. Furthermore, these cold 171yb atoms are excited from the ground-state 1S0 to the excited-state 3P0 by a clock laser with a wavelength of 578 nm. Finally, the 1S0-3P0 clock-transition spectrum of these 171yb atoms is obtained by measuring the dependence of the population of the ground-state 1 S0 upon the clock-laser detuning. 展开更多
关键词 optical lattice clocks laser cooling and trapping YTTERBIUM clock-transition spectrum
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Tunneling dynamics of Bose-Einstein condensates with higher-order interactions in optical lattice 被引量:2
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作者 铁璐 薛具奎 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第12期95-100,共6页
The nonlinear Landau Zener tunneling and nonlinear Rabi oscillations of Bose-Einstein condensate (BEC) with higher-order atomic interaction between the Bloch bands in an accelerating optical lattice are discussed. W... The nonlinear Landau Zener tunneling and nonlinear Rabi oscillations of Bose-Einstein condensate (BEC) with higher-order atomic interaction between the Bloch bands in an accelerating optical lattice are discussed. Within the two-level model, the tunneling probability of BEC with higher-order atomic interaction between Bloch bands is obtained. We finds that the tunneling rate is closely related to the higher-order atomic interaction. Furthermore, the nonlinear Rabi oscillations of BEC with higher-order atomic interaction between the bands are discussed by imposing a periodic modulation on the level bias. Analytical expressions of the critical higher-order atomic interaction for suppressing/enhancing the Rabi oscillations are obtained. It is shown that the critical value strongly depends on the modulation parameters (i.e., the modulation amplitude and frequency) and the strength of periodic potential. 展开更多
关键词 Bose-Einstein condensates optical lattices higher-order interactions
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First Evaluation and Frequency Measurement of the Strontium Optical Lattice Clock at NIM 被引量:14
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作者 林弋戈 王强 +7 位作者 李烨 孟飞 林百科 臧二军 孙震 房芳 李天初 方占军 《Chinese Physics Letters》 SCIE CAS CSCD 2015年第9期17-20,共4页
An optical lattice clock based on 87Sr is built at National Institute of Metrology (NIM) of China. The systematic frequency shifts of the clock are evaluated with a total uncertainty of 2.3×10-16. To measure it... An optical lattice clock based on 87Sr is built at National Institute of Metrology (NIM) of China. The systematic frequency shifts of the clock are evaluated with a total uncertainty of 2.3×10-16. To measure its absolute frequency with respect to NIM's cesium fountain clock NIM5, the frequency of a flywheel H-maser of NIM5 is transferred to the Sr laboratory through a 50-kin-long fiber. reference frequency of this H-maser, is used for the optical this Sr clock is measured to be 429228004229873.7(1.4)Hz. A fiber optical frequency comb, phase-locked to the frequency measurement. The absolute frequency of 展开更多
关键词 AOM First Evaluation and Frequency Measurement of the Strontium optical lattice Clock at NIM
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Magic Wavelength Measurement of the ^(87)Sr Optical Lattice Clock at NIM 被引量:2
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作者 王强 林弋戈 +5 位作者 孟飞 李烨 林百科 臧二军 李天初 方占军 《Chinese Physics Letters》 SCIE CAS CSCD 2016年第10期45-48,共4页
We report on the magic wavelength measurement of our optical lattice clock based on fermion strontium atoms at the National Institute of Metrology (NIM). A Ti:sapphire solid state laser locked to a reference cavity... We report on the magic wavelength measurement of our optical lattice clock based on fermion strontium atoms at the National Institute of Metrology (NIM). A Ti:sapphire solid state laser locked to a reference cavity inside a temperature-stabilized vacuum chamber is employed to generate the optical lattice. The laser frequency is measured by an erbium fiber frequency comb. The trap depth is modulated by varying the lattice laser power via an acousto-optic modulator. We obtain the frequency shift coefficient at this lattice wavelength by measuring the diffbrential frequency shift of the clock transition of the strontium atoms at different trap depths, and the frequency shift coefficient at this lattice wavelength is obtained. We measure the frequency shift coefficients at different lattice frequencies around the magic wavelength and linearly fit the measurement data, and the magic wavelength is calculated to be 368554672(44)MHz. 展开更多
关键词 of is as on by BE Magic Wavelength Measurement of the Sr optical lattice Clock at NIM
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Two-Dimensional Node-Line Semimetals in a Honeycomb-Kagome Lattice 被引量:2
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作者 卢金炼 罗伟 +4 位作者 李雪阳 杨晟祺 曹觉先 龚新高 向红军 《Chinese Physics Letters》 SCIE CAS CSCD 2017年第5期106-110,共5页
Recently, the concept of topological insulators has been generalized to topological semimetals, including three-dimensional (3D) Weyl semimetals, 3D Dirac semimetMs, and 3D node-line semimetals (NLSs). In particul... Recently, the concept of topological insulators has been generalized to topological semimetals, including three-dimensional (3D) Weyl semimetals, 3D Dirac semimetMs, and 3D node-line semimetals (NLSs). In particular, several compounds (e.g., certain 3D graphene networks, Cu3PdN, Ca3P2 ) were discovered to be 3D NLSs, in which the conduction and valence bands cross at closed lines in the Brillouin zone. Except for the two-dimensional (2D) Dirac semimetal (e.g., graphene), 2D topological semimetals are much less investigated. Here we propose a new concept of a 2D NLS and suggest that this state could be realized in a new mixed lattice (named as HK lattice) composed by Kagome and honeycomb lattices. It is found that A3B2 (A is a group-liB cation and B is a group-VA anion) compounds (such as Hg3As2) with the HK lattice are 2D NLSs due to the band inversion between the cation Hg-s orbital and the anion As-pz orbital with respect to the mirror symmetry. Since the band inversion occurs between two bands with the same parity, this peculiar 2D NLS could be used as transparent conductors. In the presence of buckling or spin-orbit coupling, the 2D NLS state may turn into a 2D Dirac semimetal state or a 2D topological crystalline insulating state. Since the band gap opening due to buckling or spin-orbit coupling is small, Hg3As3 with the HK lattice can still be regarded as a 2D NLS at room temperature. Our work suggests a new route to design topological materials without involving states with opposite parities. 展开更多
关键词 As HG NLS two-dimensional Node-Line Semimetals in a Honeycomb-Kagome lattice
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Controllable optical multi-well trap and its optical lattices using compounded cosine patterns 被引量:1
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作者 周琦 陆俊发 印建平 《Chinese Physics B》 SCIE EI CAS CSCD 2010年第12期181-192,共12页
This paper proposes a flexible scheme to form various optical multi-well traps for cold atoms or molecules by using a simple optical system composed of an compounded amplitude cosine-only grating and a single lens ill... This paper proposes a flexible scheme to form various optical multi-well traps for cold atoms or molecules by using a simple optical system composed of an compounded amplitude cosine-only grating and a single lens illuminated by a plane light wave or a Gaussian beam. Dynamic manipulation and evolution of multi-well trap can be easily implemented by controlling the modulation frequency of the cosine patterns. It also discusses how to expand this multi-well trap to two-dimensional lattices with single- or multi-well trap by using an orthogonally or non-orthogonally modulated grating, as well as using incoherent multi-beam illumination, and these results show that all the symmetric structures of two-dimensional Bravais lattices can be obtained facilely by using proposed scheme. 展开更多
关键词 multi-well optical trap optical lattices amplitude cosine-only grating spatial light modulator
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Stability of trapped Bose-Einstein condensates in one-dimensional tilted optical lattice potential 被引量:1
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作者 方见树 廖湘萍 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第4期80-84,共5页
Using the direct perturbation technique, this paper obtains a general perturbed solution of the Bose-Einstein condensates trapped in one-dimensional tilted optical lattice potential. We also gave out two necessary and... Using the direct perturbation technique, this paper obtains a general perturbed solution of the Bose-Einstein condensates trapped in one-dimensional tilted optical lattice potential. We also gave out two necessary and sufficient conditions for boundedness of the perturbed solution. Theoretical analytical results and the corresponding numerical results show that the perturbed solution of the Bose-Einstein condensate system is unbounded in general and indicate that the Bose-Einstein condensates are Lyapunov-unstable. However, when the conditions for boundedness of the perturbed solution are satisfied, then the Bose-Einstein condensates are Lyapunov-stable. 展开更多
关键词 Bose-Einstein condensate CHAOS STABILITY tilted optical lattice potential
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Impurity-induced localization of Bose-Einstein condensates in one-dimensional optical lattices 被引量:1
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作者 王建军 张爱霞 薛具奎 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第8期64-70,共7页
The impurity-induced localization of two-component Bose-Einstein condensates loaded into deep one-dimensional optical lattices is studied both analytically and numerically. It is shown that, the analytical criteria fo... The impurity-induced localization of two-component Bose-Einstein condensates loaded into deep one-dimensional optical lattices is studied both analytically and numerically. It is shown that, the analytical criteria for self-trapping and moving soliton/breather of the primary-component condensate are modified significantly by an admixture of an impurity component (the second component). The realization of the self-trapped state and the moving soliton/breather states of the primary-component becomes more easy with the minor admixture of the impurity-component, even if the two components are partly overlapped. 展开更多
关键词 TWO-COMPONENT optical lattices SELF-TRAPPING moving soliton/breather
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Effect of interaction strength on gap solitons of Bose-Einstein condensates in optical lattices 被引量:1
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作者 杨如曙 杨江河 《Chinese Physics B》 SCIE EI CAS CSCD 2008年第4期1189-1195,共7页
We have developed a systematic analytical approach to the study on the dynamic properties of the linear and the nonlinear excitations for quasi-one-dimensional Bose-Einstein condensate trapped in optical lattices. A n... We have developed a systematic analytical approach to the study on the dynamic properties of the linear and the nonlinear excitations for quasi-one-dimensional Bose-Einstein condensate trapped in optical lattices. A novel linear dispersion relation and an algebraic soliton solution of the condensate are derived analytically under consideration of Bose-Einstein condensate with a periodic potential. By analysing the soliton solution, we find that the interatomic interaction strength has an important effect on soliton dynamic properties of Bose-Einstein condensate. 展开更多
关键词 Bose-Einstein condensates SOLITONS optical lattices
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Tunable ground-state solitons in spin–orbit coupling Bose–Einstein condensates in the presence of optical lattices 被引量:1
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作者 张华峰 陈方 +2 位作者 郁春潮 孙利辉 徐大海 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第8期54-60,共7页
Properties of the ground-state solitons, which exist in the spin-orbit coupling (SOC) Bose-Einstein condensates (BEC) in the presence of optical lattices, are presented. Results show that several system parameters... Properties of the ground-state solitons, which exist in the spin-orbit coupling (SOC) Bose-Einstein condensates (BEC) in the presence of optical lattices, are presented. Results show that several system parameters, such as SOC strength, lattice depth, and lattice frequency, have important influences on properties of ground state solitons in SOC BEC. By controlling these parameters, structure and spin polarization of the ground-state solitons can be effectively tuned, so ma- nipulation of atoms may be realized. 展开更多
关键词 spin-orbit coupling Bose-Einstein condensates optical lattices
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Chaotic Ratchet Effect for Bose-Einstein Condensed Atoms in 1D Optical Lattices 被引量:2
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作者 FANG Jian-Shu ZHANG Xiang-Ping 《Communications in Theoretical Physics》 SCIE CAS CSCD 2008年第12期1355-1360,共6页
The chaotic ratchet effect for Bos-Einstein condensed atoms in an optical lattice is investigated. By using the direct perturbation method we obtain the chaotic solution of the condensed system. Theoretical analysis r... The chaotic ratchet effect for Bos-Einstein condensed atoms in an optical lattice is investigated. By using the direct perturbation method we obtain the chaotic solution of the condensed system. Theoretical analysis reveals that the transport of the condensed atoms in the ratchet potential is a chaotic one, and corresponding numerical results agree well with the theoretical results. 展开更多
关键词 chaotic ratchet effect condensed atoms optical lattices
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Elliptic Function Waves of Spinor Bose-Einstein Condensates in an Optical Lattice 被引量:2
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作者 XIE Yuan-Dong 《Communications in Theoretical Physics》 SCIE CAS CSCD 2009年第3期445-449,共5页
An improved nonlinear Schrodinger equation different from usual one of spinor Bose-Einstein condensates (BECs) in an optical lattice are obtained by taking into account a nonlinear term in the equation of motion for... An improved nonlinear Schrodinger equation different from usual one of spinor Bose-Einstein condensates (BECs) in an optical lattice are obtained by taking into account a nonlinear term in the equation of motion for probability amplitude of spins carefully. The elliptic function wave solutions of the model are found under specific boundary condition, for example, the two ends of the atomic chain are fixed. In the case of limit the elliptic function wave solutions are reduced into spin-wave-like or solitons. 展开更多
关键词 spinor Bose Einstein condensates optical lattice elliptic tunction wave solution SOLITON
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Lattice vibration and Raman scattering of two-dimensional van der Waals heterostructure 被引量:1
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作者 Xin Cong Miaoling Lin Ping-Heng Tan 《Journal of Semiconductors》 EI CAS CSCD 2019年第9期13-19,共7页
Research on two-dimensional(2D) materials and related van der Waals heterostructures(vdWHs) is intense and remains one of the leading topics in condensed matter physics.Lattice vibrations or phonons of a vdWH provide ... Research on two-dimensional(2D) materials and related van der Waals heterostructures(vdWHs) is intense and remains one of the leading topics in condensed matter physics.Lattice vibrations or phonons of a vdWH provide rich information,such as lattice structure,phonon dispersion,electronic band structure and electron–phonon coupling.Here,we provide a mini review on the lattice vibrations in vdWHs probed by Raman spectroscopy.First,we introduced different kinds of vdWHs,including their structures,properties and potential applications.Second,we discussed interlayer and intralayer phonon in twist multilayer graphene and MoS2.The frequencies of interlayer and intralayer modes can be reproduced by linear chain model(LCM)and phonon folding induced by periodical moiré potentials,respectively.Then,we extended LCM to vdWHs formed by distinct 2D materials,such as MoS2/graphene and hBN/WS2 heterostructures.We further demonstrated how to calculate Raman intensity of interlayer modes in vdWHs by interlayer polarizability model. 展开更多
关键词 two-dimensional materials VAN der WAALS HETEROSTRUCTURE Raman spectroscopy lattice vibration PHONON
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