Matter-wave interference in an axial triple-well optical dipole trap

This paper proposes a scheme of axial triple-well optical dipole trap by employing a simple optical system composed of a circular cosine grating and a lens. Three optical wells separated averagely by -37 μm were created when illuminating by a YAG laser with power 1 mW. These wells with average trapping depth -0.5 μK and volume -74 μm^3 are suitable to trap and manipulate an atomic Bose-Einstein condensation （BEC）. Due to a controllable grating implemented by a spatial light modulator, an evolution between a triple-well trap and a single-well one is achievable by adjusting the height of potential barrier between adjacent wells. Based on this novel triple-well potentials, the loading and splitting of BEC, as well as the interference between three freely expanding BECs, are also numerically stimulated within the framework of mean-field treatment. By fitting three cosine functions with three Gaussian envelopes to interference fringe, the information of relative phases among three condensates is extracted.

Dynamic stability and manipulation of bright matter-wave solitons by optical lattices in Bose-Einstein condensates

An extended variation approach to describing the dynamic evolution of self-attractive Bose-Einstein condensates is developed. We consider bright matter-wave solitons in the presence of a parabolic magnetic potential and a timespace periodic optical lattice. The dynamics of condensates is shown to be well approximated by four coupled nonlinear differential equations. A noteworthy feature is that the extended variation approach gives a critical strength ratio to support multiple stable lattice sites for the condensate. We further examine the existence of the solitons and their stabilities at the multiple stable lattice sites. In this case, the analytical predictions of Bose-Einstein condensates variational dynamics are found to be in good agreement with numerical simulations. We then find a stable region for successful manipulating matter-wave solitons without collapse, which are dragged from an initial stationary to a prescribed position by a moving periodic optical lattice.

Moving Matter-Wave Solitons in Spin-Orbit Coupled Bose-Einstein Condensates

We investigate the moving matter-wave solitons in spin-orbit coupled Bose Einstein condensates （BECs） by a perturbation method. Starting with the one-dimensional Gross Pitaevskii equations, we derive a new KdV-like equation to which an approximate solution is obtained by assuming weak Raman coupling and strong spin orbit coupling. The derivation of the KdV-like equation may be useful to understand the properties of solitons excitation in spin-orbit coupled BECs. We find different types of moving solitons： dark-bright, bright bright and dark dark solitons. Interestingly, moving dark-dark soliton for attractive intra- and inter-species interactions is found, which depends on the Raman coupling. The amplitude and velocity of the moving solitons strongly depend on the Raman coupling and spin orbit coupling.

Collision Dynamics of Dissipative Matter-Wave Solitons in a Perturbed Optical Lattice

We investigate the stability and collision dynamics of dissipative matter-wave solitons formed in a quasi-one- dimensional Bose-Einstein condensate with linear gain and three-body recombination loss perturbed by a weak optical lattice. It is shown that the linear gain can modify the stability of the single dissipative soliton moving in the optical lattice. The collision dynamics of two individual dissipative matter-wave solitons explicitly depend on the linear gain parameter, and they display different dynamical behaviors in both the in-phase and out-of-phase interaction regimes.

Matter-Wave Solitons in Two-Dimensional Bose—Einstein Condensates with Time-Dependent Scattering Length in a Harmonic Trap

We present three families of one-soliton solutions for (2+l)-dimensional Gross-Pitaevskii equation withboth time-dependent scattering length and gain or loss in a harmonic trap.Then we investigate the dynamics of thesesolitons in Bose-Einstein condensates (BECs) by some selected control functions.Our results show that the intensitiesof these solitons first increase rapidly to the condensation peak,then decay very slowly to the background;thus thelifetime of a bright soliton,a train of bright solitons and a dark soliton in BECs can be all greatly extended.Our resultsoffer a useful method for observing matter-wave solitons in BECs in future experiments.

Matter-Wave Solitons in Two-Component Bose—Einstein Condensates with Tunable Interactions and Time Varying Potential

We present three families of exact matter-wave soliton solutions for an effective one-dimension twocomponent Bose-Einstein condensates(BECs) with tunable interactions,harmonic potential and gain or loss term. We investigate the dynamics of bright-bright solitons,bright-dark solitons and dark-dark solitons for the time-dependent expulsive harmonic trap potential,periodically modulated harmonic trap potential,and kinklike modulated harmonic trap potential.Through the Feshbach resonance,these dynamics can be realized in experiments by suitable control of time-dependent trap parameters,atomic interactions,and interaction with thermal cloud.

Quadrupolar matter-wave soliton in two-dimensional free space

We study two-dimensional （2D） matter-wave solitons in the mean-field models formed by electric quadrupole particles with long-range quadrupoleluadrupole interaction （QQI） in 2D free space. The existence of 2D matter-wave solitons in the free space was predicted using the 2D Gross Pitaevskii Equation （GPE）. We find that the QQI solitoms have a higher mass （smaller size and higher intensity） and stronger anisotropy than the dipol^dipole interaction （DDI） solitons under the same environmental parameters. Anisotropic solitomsoliton interaction between two identical QQI solitons in 2D free space is studied. Moreover, stable anisotropic dipole solitons are observed, to our knowledge, for the first time in 2D free space under anisotropic nonlocal cubic nonlinearity.

Cross-symmetry breaking of two-component discrete dipolar matter-wave solitons

We study the spontaneous symmetry breaking of dipolar Bose-Einstein condensates trapped in stacks of two-well systems, which may be effectively built as one-dimensional trapping lattices sliced by a repelling laser sheet. If the potential wells are sufficiently deep, the system is modeled by coupled discrete Gross-Pitaevskii equations with nonlocal self- and cross-interaction terms representing dipole-dipole interactions. When the dipoles are not polarized perpendicular or parallel to the lattice, the cross- interaction is asymmetric, replacing the familiar symmetric two-component solitons with a new species of cross-symmetric or -asymmetric ones. The orientation of the dipole moments and the interwell hopping rate strongly affect the shapes of the discrete two-component solitons as well as the characteristics of the cross-symmetry breaking and the associated phase transition. The sub- and super-critical types of cross-symmetry breaking can be controlled by either the hopping rate between the components or the total norm of the solitons. The effect of the interplay between the contact nonlinearity and the dipole angle on the cross-symmetry breaking is also discussed.

Dynamics of Analytical Matter-Wave Solutions in Three-Dimensional Bose–Einstein Condensates with Two- and Three-Body Interactions

Using the F-expansion method we present analytical matter-wave solutions to Bose–Einstein condensates with two- and three-body interactions through the generalized three-dimensional Gross–Pitaevskii equation with timedependent coefficients, for the periodically time-varying interactions and quadratic potential strength. Such solutions exist under certain conditions, and impose constraints on the functions describing potential strength, nonlinearities, and gain(loss). Various shapes of analytical matter-wave solutions which have important applications of physical interest are studied in details.

仿真引力系统的非线性光学实验进展

非线性薛定谔方程(nonlinear Schrodinger equation,NLSE)是多类物理现象所遵守规律的共同数学形式。在光学系统中,NLSE可以描述激光脉冲在介质中传播的时空演化;在天文学中,可以描述引力透镜、波动暗物质纤维等天体和观测现象(所谓薛定谔―泊松方程系统,SPE),甚至可以巧妙地用来类比强引力场现象(所谓爱因斯坦Klein-Gordon系统,EKG)。从仿真原理、光路设计、实验结果、天文诠释等方面,详细介绍了非线性光学仿真实验在天文学领域的应用和进展;并简要展望了未来开展非线性光学实验,仿真各种波动暗物质结构的演化之前景。

Determination of Solar Radius and Earth’s Radius by Relativistic Matter Wave

In recent years, relativistic matter waves have been applied to the solar system to explain some quantum gravity effects. This paper shows that the solar size and Earth’s size are the consequences of Bode’s rule in terms of the relativistic matter wave. The solar radius is determined as 7e+8 (m) with a relative error of 0.72%;the Earth’s radius is determined as 6.4328e+6 (m) with a relative error of 0.86%. The Earth’s atmospheric circulation is also investigated in terms of the relativistic matter wave, the wind fields on the Earth’s surface are calculated, and the results agree well with experimental observation. These findings indicate that the solar system is under the control of the planetary relativistic matter waves.

悬浮颗粒物对沉潜油形成的试验研究

选择渤海原油为试验油,通过批吸附实验研究了高岭土和试验原油的相互作用。结果表明,悬浮颗粒物浓度为300 mg/L时,渤海原油在典型海洋动力环境下的沉潜率约为34%±4%,30 min基本达到吸附平衡,粒径和盐度变化对沉潜率的影响低于5%。水槽试验结果表明小颗粒聚集油相互聚合可形成大颗粒聚集油,(400±50)μm粒径大小聚集油占比超过50%。该研究可为海洋环境中沉潜油的形成、扩散及污染问题提供理论指导。

On the Existence of a Minimum Universal Speed of Physical Transmissions Associated with Matter Wave in Special Relativity

In this work, we show that it is possible to establish coordinate transformations between inertial reference frames in the theory of special relativity with a minimum universal speed of physical transmissions. The established coordinate transformations, referred to as modified Lorentz transformations because they have almost identical form to the Lorentz transformations, also comply with the requirement of invariance of the Minkowski line element. Particularly, the minimum universal speed can be associated with the phase speed of de Broglie matter wave. As application, we also discuss the possibility to formulate relativistic classical and quantum mechanics for the special relativity associated with the modified Lorentz transformations, which describes physical processes that represent an expansion or a collapsing of massive quantum particles.

Magnetism: Further Proof of Wave Particle Duality

The question of what magnetism is vital to quantum physics. We know what all other quantum phenomenon is, but we did not know what magnetism is. It is not enough to say it is a force because of a charge. That force must be something, for consistencies sake it had to be tested. This paper was written in order to confirm the results that were received in the experiments that took place that led to the paper “Magnetism: Insights from the Thomas Young Experiment” where it was concluded the magnetic phenomenon is both a particle and a wave. Will different interference patterns confirm a khumalon and wave like behaviour? The khumalon is the name of the particle associated with magnetic phenomenon. This paper concludes by confirming what was discovered in mentioned paper. Magnetism organizes into a wave no matter the interference. Understanding this reality, it allows us to understand what is happening with simple magnetic interactions. When like poles meet because they can not occupy the same space they push each other. Opposite poles are antiparticles to each other and annihilate each other. South pole scientifically speaking is not attracted to the north pole, the reason why the magnets slam each other is because they are closing a magnetic vacuum caused by the particles annihilating each other. We can now start theorizing on why a lodestone attracts iron because we now know we are dealing with a particle.

Magnetism: Further Proof of Wave Particle Duality

The question of what magnetism is vital to quantum physics. We know what all other quantum phenomenon is, but we did not know what magnetism is. It is not enough to say it is a force because of a charge. That force must be something, for consistencies sake it had to be tested. This paper was written in order to confirm the results that were received in the experiments that took place that led to the paper “Magnetism: Insights from the Thomas Young Experiment” where it was concluded the magnetic phenomenon is both a particle and a wave. Will different interference patterns confirm a khumalon and wave like behaviour? The khumalon is the name of the particle associated with magnetic phenomenon. This paper concludes by confirming what was discovered in mentioned paper. Magnetism organizes into a wave no matter the interference. Understanding this reality, it allows us to understand what is happening with simple magnetic interactions. When like poles meet because they can not occupy the same space they push each other. Opposite poles are antiparticles to each other and annihilate each other. South pole scientifically speaking is not attracted to the north pole, the reason why the magnets slam each other is because they are closing a magnetic vacuum caused by the particles annihilating each other. We can now start theorizing on why a lodestone attracts iron because we now know we are dealing with a particle.

玻色-爱因斯坦凝聚(BEC)现象的研究

玻色 -爱因斯坦凝聚 (BEC)的研究是当前物理学研究的一个新热点 ,国内外许多学者都开展了研究 .为探讨有关 BEC的普遍性质和规律以及影响 BEC的主要物理因素 ,我们研究了任意空间维数下 ,处于任意幂函数型外势约束中具有不同运动特征的玻色气体和费米气体的性质 .导出量子态密度、巨势及其它热力学函数的普遍解析表达式 ,提出赝体积和普遍热波长等新概念 ,首次求得有外势约束的玻色气体的态方程 ,并揭示了 BEC的一些新性质和确立了有关 BEC的两个新判据 ,同时还发现了 N0 / N～ T/ TC 曲线必为凸型的新规律 ,等等 .所得结果有助于深入了解 BEC这种新物态的特性 ,并为实验选择最佳外势阱的形式及其它物理参数提供一些新的理论依据 .此外还简要地介绍了国内外研究动态与进展以及本研究的前景 .

太湖水体中悬浮物研究

为了全面了解太湖水中悬浮物的物质组成、变化规律,选取了太湖站近10年来各测点的连续观测资料及2次定点观测资料,分析了太湖水体中悬浮物的无机和有机颗粒成份、时空分布、垂直变化、与风速、风向的关系以及与重要光学参数的关系。研究结果表明:太湖悬浮物中有机物大概占30%;浓度大小的湖区分布大致是:湖心区>河口区、梅梁湖、贡湖、五里湖>东太湖;悬浮物浓度的季节变化是:湖心区冬季、春季>秋季>夏季,东太湖冬季>春季、夏季、秋季,其他湖区则没有明显季节变化;垂直分布是:深层>表层并且底泥悬浮的临界风速在5～6.5m/s之间;悬浮物浓度的增加是引起湖水透明度降低和光学衰减系数增大的主要原因。

超流体陀螺的动态性能研究

为研究新型高精度超流体陀螺的动态性能,分析了影响其可测的角加速度因素;在构建了热驱动时约瑟夫森频率数学模型的基础上,对可测的角加速度进行了数值分析。研究结果表明:根据通用的参数,超流体陀螺可测的角加速度最大值约为0.32 rad/s2,因此超流体陀螺的动态性能较小,它适合应用于对角速度的精度要求很高,且角速度缓慢变化的领域。

凝聚态物质状态方程的一个数值模型

建立了凝聚态物质的一个三项式状态方程:以Faussurier平均原子模型为基础计算电子热压和电子热能;以Cowan模型为基础计算离子热压和离子热能;用基于实验数据的半经验拟合公式计算物质的冷压和冷能。用实验数据检验了用平均原子模型计算的平均电离度。将状态方程与Hugoniot关系式相结合,计算了Be和Al的冲击绝热曲线,结果充分地展现出电子在高温、高密度条件下的壳层结构效应。

基于物元模型的机场环境影响综合评价

分析机场环境影响因素特征,构建机场环境影响评价指标体系;应用物元分析理论,建立机场环境影响多指标分层次综合评价物元模型,并介绍了采用该模型进行机场环境影响单要素对象评价以及整体综合评价的基本方法和主要步骤。同时结合实例进行评价计算和分析,结果表明该方法能较好的反映机场环境影响的综合水平。