共查询到20条相似文献,搜索用时 46 毫秒
1.
J. E. Avron 《Journal of statistical physics》1998,92(3-4):543-557
When time reversal is broken, the viscosity tensor can have a nonvanishing odd part. In two dimensions, and only then, such odd viscosity is compatible with isotropy. Elementary and basic features of odd viscosity are examined by considering solutions of the wave and Navier–Stokes equations for hypothetical fluids where the stress is dominated by odd viscosity. 相似文献
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《中国科学:物理学 力学 天文学(英文版)》2021,(11)
The systems exhibiting sustainable external energy exchange are abundant, e.g., biological organisms' reaction to external stimuli while maintaining a constant energy exchange with the surrounding. In a linear mechanical system exhibiting an external energy gain or release, the recently proposed odd elasticity theory can characterize the overall stress and strain response.However, realizing the required odd elasticity is still challenging. In this work, we discovered that the smart materials with designed feedbacks can achieve this odd elasticity, thereby providing a practical platform to analyze the phenomenon related to this novel elasticity theory. We also demonstrated this idea by designing a non-reciprocal Rayleigh wave via odd elasticity and the equivalent piezoelectricity with linear feedback. The underpinned electric energy scenario was also examined. Our work establishes a method to easily realize the materials with odd elastic behaviors and explore the rich phenomena related to nonHermitian systems. 相似文献
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Andrzej M. Frydryszak 《Czechoslovak Journal of Physics》2004,54(11):1275-1280
We generalize the superfield method of Dirac quantization to the odd sector of superspace for N = 2 extended models. We discuss the mechanism of generating constraints in the odd sector of supersymmetric classical mechanics and then Dirac quantization in the odd superspace in superfield version. An example of supersymmetric system, defined by odd superfields, and the application of the method in the odd superspace is given. 相似文献
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We consider odd Laplace operators acting on densities of various weights on an odd Poisson (= Schouten) manifold M. We prove that the case of densities of weight 1/2 (half-densities) is distinguished by the existence of a unique odd Laplace operator depending only on a point of an 'orbit space' of volume forms. This includes earlier results for the odd symplectic case, where there is a canonical odd Laplacian on half-densities. The space of volume forms on M is partitioned into orbits by the action of a natural groupoid whose arrows correspond to the solutions of the quantum Batalin–Vilkovisky equations. We compare this situation with that of Riemannian and even Poisson manifolds. In particular, we show that the square of an odd Laplace operator is a Poisson vector field defining an analog of Weinstein's 'modular class'. 相似文献
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We consider a vertex model on the simple-quartic lattice defined by line graphs on the lattice for which there is always an odd number of lines incident at a vertex. This is the odd 8-vertex model which has eight possible vertex configurations. We establish that the odd 8-vertex model is equivalent to a staggered8-vertex model. Using this equivalence we deduce the solution of the odd8-vertex model when the weights satisfy a free-fermion condition. It is found that the free-fermion model exhibits no phase transitions in the regime of positive vertex weights. We also establish the complete equivalence of the free-fermion odd 8-vertex model with the free-fermion 8-vertex model solved by Fan and Wu. Our analysis leads to several Ising model representations of thefree-fermion model with pure 2-spin interactions. 相似文献
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We demonstrate a novel scheme to control the excitation symmetry for an odd mode in a photonic crystal waveguide and investigate the spectral signature of this slow light mode. An odd-mode Mach-Zehnder coupler is introduced to transform mode symmetry and excite a high-purity odd mode with 20?dB signal contrast over the background. Assisted by a mixed-mode Mach-Zehnder coupler, slow light mode beating can be observed and is utilized to determine the group index of this odd mode. With slow light enhancement, this odd mode can help enable novel miniaturized devices such as one-way waveguides. 相似文献
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偶奇qs相干态的非经典特性 总被引:7,自引:1,他引:6
利用数值计算方法研究了q和s畸变对双参数形变偶奇qs相干态量子统计特性的委现偶奇qs相干态与通常的偶奇相干态有着显著不同的量子统计性质,压缩效应和反聚束效应均可在一定条件下的两种双参数畸变态中出现,偶奇qs相干态和通常偶奇相干态的差异随q值偏离1越大和s的取值越小而越大。 相似文献
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PropertiesofAmplitudeNth┐powerSqueezingofEvenandOddqs┐CoherentStatesWANGJisuo1)SUNChangyong1)HEJinyu2)(1)DepartmentofPhysics... 相似文献
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In this paper, we use the numerical method to study the influences of q and s deformations on the quantum statistical Properties of even and odd qs-coherent states. It is shown that nonclassical properties of the even and odd qs-coherent states are very different from those of the usual even and odd coherent states. It is found that squeezing and antibunching effect appear for both even and odd qs-coherent states in some range of the parameters q, s and r. The smaller the q (q < 1) and s are, the.Jarger the difference between the even and odd qs-coherent states and the usual even and odd coherent states is. 相似文献
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压缩奇偶相干态的量子统计性质 总被引:8,自引:2,他引:6
用压缩算子作用在奇偶相干态上即可得到压缩奇偶相干态.本文研究了这类量子态的统计特性.结果表明,压缩奇相干态和压缩偶相干态都能处于压缩状态,它们的光子亦都可能出现反聚束的现象. 相似文献
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P. Braun-Munzinger C. K. Gelbke H. L. Harney D. Agassi 《Zeitschrift für Physik A Hadrons and Nuclei》1975,273(1):57-58
The symmetry property of the transition matrix for a reaction producing an isobaric multiplet (or identical particles) is derived from the generalized Pauli principle without any specific assumptions concerning the reaction mechanism. In contrast to previous predictions it is shown that for odd partial waves in the exit channel the cross section will generally not vanish at Θ = π/2 if the channel spin projections of the initial and final channels may be different. 相似文献
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We introduce a new canonical trace on odd class logarithmic pseudo-differential operators on an odd dimensional manifold, which vanishes on commutators. When restricted to the algebra of odd class classical pseudo-differential operators our trace coincides with the canonical trace of Kontsevich and Vishik. Using the new trace we construct a new determinant of odd class classical elliptic pseudo-differential operators. This determinant is multiplicative up to sign whenever the multiplicative anomaly formula for usual determinants of Kontsevich–Vishik and Okikiolu holds. When restricted to operators of Dirac type our determinant provides a sign refined version of the determinant constructed by Kontsevich and Vishik. We discuss some applications of the symmetrized determinant to a non-linear sigma-model in superconductivity. 相似文献
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Xiao-Yan Zhang Ji-Suo Wang Xiang-Guo Meng Jie Su 《International Journal of Theoretical Physics》2009,48(3):803-814
Using the coherent state representation of Wigner operator and the technique of integration within an ordered product (IWOP)
of operators, the Wigner functions of the even and odd negative binomial states (NBSs) are obtained. We concentrate our analysis
on the fact that the even and odd NBSs interpolate between the even and odd coherent states and the even and odd quasi-thermal
states depending on the values of the parameters involved. Moreover, the tomograms of the even and odd NBSs are calculated
by virtue of intermediate coordinate-momentum representation in quantum optics.
Project 10574060 supported by the National Natural Science Foundation of China and project Q2007A01 supported by the Natural
Science Foundation of Shandong Province. 相似文献
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研究结果表明,只有当以k>3)为奇数时,偶q相干态呈现振幅k次方压缩性质;无论k为偶数还是奇数,奇q相干态均不呈现压缩性质。 相似文献
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Kerr偶奇相干态及其非经典性 总被引:6,自引:0,他引:6
本文对Ker偶奇相干态及其非经典性质进行了研究。结果表明:Kerr偶相干态可呈现周期性的二阶压缩效应,Kerr奇相干态则不存在这种压缩效应;但两者均可呈现周期性的振幅平方压缩效应,这与通常偶奇相干态的情形有所不同。 相似文献