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Non-Hydrogenic Rydberg Atoms in Magnetic Fields 磁场中的非氢里德伯原子
Pub Date : 2013-05-16 DOI: 10.1143/PTPS.116.403
P. Dando, T. S. Monteiro, W. Jans, W. Schweizer
The classical and quanta! dynamics of non-hydrogenic Rydberg atoms in magnetic fields are investigated. Previous attempts to infer classical behaviour from quantum properties produced conflicting results: at low scaled energies (c:= -0.5) the nearest-neighbour statistics (NNS) were found to be at the chaotic (Wigner) limit while quantum phase-space distribu­ tions suggested a high degree of regularity. Here the classical limit is investigated directly by solving the equations of motion of the Diamagnetic Kepler problem (DKP) with an additional non-Coulombic model potential. It is found that typically trajectories are, over a long time-scale, ergodic. However over a shorter time-scale-in between collisions with the core-classical trajectories remain confined on the tori of the DKP. The origin of a well-known resonance in the NNS of hydrogen at c:= -0.316 is clarified by the comparison with the non-hydrogenic behaviour. However, the classical model only partially explains the quantum behaviour. The difficulties of quantizing such a system are discussed.
经典和量子!研究了非氢里德伯原子在磁场中的动力学。先前从量子特性推断经典行为的尝试产生了相互矛盾的结果:在低尺度能量(c:= -0.5)下,发现最近邻统计量(NNS)处于混沌(维格纳)极限,而量子相空间分布则显示出高度的规律性。本文通过求解带有附加非库仑模型势的反磁开普勒问题(DKP)的运动方程,直接研究了经典极限。我们发现,在很长的时间尺度上,典型的轨迹是遍历的。然而,在较短的时间尺度上——在与核心碰撞之间——经典轨迹仍然局限于DKP的环面。通过与非成氢行为的比较,澄清了在c:= -0.316处氢的NNS中一个众所周知的共振的起源。然而,经典模型只能部分解释量子行为。讨论了量化这种系统的困难。
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引用次数: 3
Microscopic Calculations for O(6) Nuclei by the Interacting Boson Model 用相互作用玻色子模型对O(6)核进行微观计算
Pub Date : 2013-05-16 DOI: 10.1143/PTPS.125.97
T. Mizusaki, T. Otsuka
We present microscopic calculations of the Interacting Boson Model (IBM) based on the shell model interaction by using the OAI mapping approach. We determine the col­ lective pairs, which correspond to the IBM bosons, by the number conserved Hartree-Fock­ Bogoluibov (HFB) and the proton-neutron Tamm-Dancoff methods, and we take into consid­ eration couplings to the non-collective degrees of freedom. The present realistic calculations are carried out for the Te, Xe and Ba isotopes. Among them, the Xe isotopes are known by numerous phenomenological works to show the 0(6) symmetry. We present the clear 0(6) symmetry in the spectra and the wave function which are microscopically obtained. Low-lying spectra of medium and medium-heavy nuclei show simple and regular structures, although these nuclei consist of many interacting protons and neutrons and their dynamics is intrinsically very complicate. This is known to be the collec­ tive motion. Especially, in the case of even-even nuclei, there are quite simpler and common features in energy levels and electro-magnetic transitions. The understand­ ing of them has been one of the main problems in nuclear structure. Many theories have been advocated, developed and extended. Among them, the Interacting Boson Model (IBM), l)- 6 ) which was first introduced by Arima and Iachello in the 1970's, has shown to be rather successful. In the IBM, nucleon collective pairs are approximated in terms of bosons. This notion can simplify the treatment of the nucleon many-body system. Furthermore this ansatz facilitates the group theoretical treatment. Originally s and d bosons, which are counterparts of S(J = 0) and D(J = 2) nucleon pairs, are introduced as the building blocks of the IBM. Because these bosons do not distinguish the proton and neutron degrees of freedom, the nucleon pair counterparts of these bosons are ambiguous. But, the s and d bosons span a U(6) space and its group chains containing the 0(3) subgroup correspond physically to vibrational, rotational and '"'( unstable nuclei as limiting cases. These group chains are U(5), SU(3) and 0(6) limits. Unlike to other collective models, the IBM can give us a clear description of the 0(6) nuclei besides the U(5) and SU(3) nuclei. There are many nuclei, the spectra of which show the pattern of these group theoretical limits. Furthermore the intermediate situations between three limits are easily tractable by diagonalization of the Hamiltonian because the dimension of the original IBM space is at most about one hundred. At this stage, many phenomenological works were carried out, which showed that the low-lying states of many even-even nuclei can be explained by using six parameters of the IBM in a unified way. These parameters are considered to
我们利用OAI映射方法,提出了基于壳模型相互作用的相互作用玻色子模型(IBM)的微观计算。我们用Hartree-Fock - Bogoluibov (HFB)守恒数和质子-中子tam - dancoff方法确定了与IBM玻色子对应的集体对,并考虑了与非集体自由度的耦合。本文对Te、Xe和Ba同位素进行了实际计算。其中,Xe同位素在许多现象学研究中显示出0(6)对称性。我们提出了清晰的0(6)对称的光谱和波函数,这是显微镜下获得的。中、中重核的低洼谱显示出简单而规则的结构,尽管这些核由许多相互作用的质子和中子组成,其动力学本质上是非常复杂的。这就是所谓的集体运动。特别是,在偶偶核的情况下,能级和电磁跃迁有相当简单和共同的特征。对它们的理解一直是核结构的主要问题之一。许多理论被提倡、发展和扩展。其中,由Arima和Iachello在20世纪70年代首次提出的相互作用玻色子模型(IBM), 1)- 6)已经证明是相当成功的。在IBM中,核子集体对是用玻色子来表示的。这个概念可以简化核子多体系统的处理。此外,这一分析有利于群体理论处理。最初,s和d玻色子是s (J = 0)和d (J = 2)核子对的对应物,是作为IBM的构建块引入的。因为这些玻色子不能区分质子和中子的自由度,所以这些玻色子对应的核子对是不明确的。但是,s和d玻色子跨越U(6)空间,其包含0(3)子群的基团链在物理上对应于振动、旋转和“不稳定”核作为极限情况。这些群链是U(5)、SU(3)和0(6)极限。与其他集体模型不同,IBM可以为我们提供除了U(5)和SU(3)原子核之外的0(6)原子核的清晰描述。有许多原子核,它们的光谱显示了这些群理论极限的模式。此外,由于原始IBM空间的维数最多约为100,因此通过对角化哈密顿量可以很容易地处理三个极限之间的中间情况。在这一阶段,进行了许多现象学工作,表明许多偶偶核的低洼态可以用IBM的六个参数统一解释。这些参数被认为是
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引用次数: 30
Non-Gaussian Parameter and Heterogeneity of Amorphous Polymers 非高斯参数与非晶聚合物的非均质性
Pub Date : 2013-05-16 DOI: 10.1143/PTPS.126.133
T. Kanaya, I. Tsukushi, K. Kaji
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引用次数: 10
Aging in Glasses: Traps and Mode-Coupling Theory 玻璃中的老化:陷阱和模式耦合理论
Pub Date : 2013-05-16 DOI: 10.1143/PTPS.126.181
J. Bouchaud, M. Mézard
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引用次数: 1
Models of Molecular Cooperativity in Liquids near the Glass Transition 接近玻璃化转变的液体中的分子协同性模型
Pub Date : 2013-05-16 DOI: 10.1143/PTPS.126.53
J. Jäckle
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引用次数: 0
On the Nature of Bi in Molten Bi-BiI3 Mixtures and In in Molten In-InI3 Mixtures 熔融Bi- bii3混合物中的Bi和熔融in - ini3混合物中的in的性质
Pub Date : 2013-05-16 DOI: 10.1143/PTPS.72.156
K. Ichikawa
The nature of Bi in molten Bi-Biia mixtures and In in molten In-Inia mixtures is surveyed on the basis of static properties and macroscopic transport coefficient (phase diagram and d.c. conductivity). It is shown that information at the microscopic level due to techniques of pulsed neutron scattering, Raman scattering and NMR can account for their nature. From pulsed neutron scattering data preferred Bi-Bi pair-correlation or polybismuth species is proposed for Bi..It-z melts even at the I-rich side below about 40 at% Bi. The localized electronic states around the Fermi level may be established and conduction takes place via hopping of electrons from one trapping site to another for these solutions. The strong concentrationdependence of the first peak distance, which is related to preferred Bi-Bi distance and observed over the range of 0.4
根据静态性质和宏观输运系数(相图和直流电导率)考察了熔融Bi- biia混合物中的Bi和熔融in - inia混合物中的in的性质。结果表明,脉冲中子散射、拉曼散射和核磁共振技术在微观水平上的信息可以解释它们的性质。根据脉冲中子散射数据,提出了优选Bi-Bi对相关或多铋物质。在% Bi下,它-z甚至在富i的一侧熔化。在这些溶液中,可以建立费米能级附近的局域电子态,并通过电子从一个捕获点跳到另一个捕获点来发生传导。在0.4
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引用次数: 2
t-Matrix Approximation to Two-Dimensional Hubbard Model 二维Hubbard模型的t矩阵逼近
Pub Date : 2013-05-16 DOI: 10.1143/PTPS.101.441
H. Fukuyama, Y. Hasegawa
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引用次数: 2
Structure and Representations of the W ∞ Algebra W∞代数的结构与表示
Pub Date : 2013-05-16 DOI: 10.1143/PTPS.102.15
I. Bakas, E. Kiritsis
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引用次数: 5
Matrix Models of 2D Gravity and Isomonodromic Deformation 二维重力和等单调变形的矩阵模型
Pub Date : 2013-05-16 DOI: 10.1143/PTPS.102.255
G. Moore
One of the principal goals of the theory of 2D gravity is making sense of the formal expression $$Zleft( {mu ,kappa ;{t_i}} right) = sumlimits_h {{{int_{ME{T_h}} {dge} }^{mu int {sqrt g + kint {sqrt g } + k} }}} {Z_{QFTleft( {{t_i}} right)}}left[ g right]$$(1.1)where we integrate over metrics g on surfaces with h handles with a weight defined by the Einstein-Hilbert action (μ is the cosmological constant and κ is Newton’s constant, or, equivalently, the string coupling) together with the partition function of some 2D quantum field theory, QFT(t i ). The parameters t i are coordinates on a subspace of the space of 2D field theories, or, equivalently, coordinates for a space of string backgrounds.
二维引力理论的主要目标之一是使形式表达式$$Zleft( {mu ,kappa ;{t_i}} right) = sumlimits_h {{{int_{ME{T_h}} {dge} }^{mu int {sqrt g + kint {sqrt g } + k} }}} {Z_{QFTleft( {{t_i}} right)}}left[ g right]$$(1.1)有意义,其中我们在带有h柄的曲面上对度量g进行积分,积分权由爱因斯坦-希尔伯特作用(μ是宇宙学常数,κ是牛顿常数,或者等价地,弦耦合)和某些二维量子场理论的配分函数QFT(t i)定义。参数t i是二维场论空间的一个子空间上的坐标,或者,等价地,是弦背景空间的坐标。
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引用次数: 109
Orthogonality Exponents in Low-Dimensional Metals 低维金属中的正交指数
Pub Date : 2013-05-16 DOI: 10.1143/PTPS.106.147
K. Schönhammer
The Anderson orthogonality exponents K + for introducing a localized perturbation into an electron gas and K(a) for displacing the localized potential by a vector a are discussed for one- and two-dimensional systems. It is shown that the smoothness of the potential enters very differently in the exponents K + and K(a). The controversial point of the boundedness of the two exponents is clarified
讨论了一维和二维系统中引入局域扰动的安德森正交指数K +和用矢量a取代局域势的K(a)。结果表明,在指数K +和指数K(a)中,势的平滑性有很大的不同。澄清了两个指数有界性的争议点
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引用次数: 0
期刊
Progress of Theoretical Physics Supplement
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