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21.
Working in the physics of Wilson factor and Aharonov-Bohm effect,we find in the fluxtubequark system the topology of a baryon consisting of three heavy flavor quarks resembles that of the fractional quantum Hall effect(FQHE)in condensed matter.This similarity yields the result that the constituent quarks of baryon have the"filling factor"1/3.thus the previous conjecture that quark confinement is a correlation effect is confirmed.Moreover,by deriving a Hamiltonian of the system analogous to that of FQHE,we predict an energy gap for the ground state of a heavy three-quark system. 相似文献
22.
U. Leonhardt T. Kiss P. Piwnicki 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》1999,7(3):413-423
Impressive pictures of moving Bose-Einstein condensates have been taken using phase-contrast imaging [M.R. Andrews et al., Science 273, 84 (1996)]. We calculate the quantum backaction of this measurement technique, assuming the absence of residual absorption.
We find that the condensate gets gradually depleted at a universal rate that is proportional to the light intensity and to
the inverse cube of the optical wave length. The fewer atoms are condensed the higher is the required intensity to see a picture,
and, consequently, the higher is the induced backaction. To describe the quantum physics of phase-contrast imaging we put
forward a new approach to quantum-optical propagation. We develop an effective field theory of paraxial optics in a fully
quantized atomic medium.
Received 25 February 1999 相似文献
23.
Francisco Correa 《Annals of Physics》2010,325(12):2653-2667
The quantum non-relativistic spin-1/2 planar systems in the presence of a perpendicular magnetic field are known to possess the N = 2 supersymmetry. We consider such a system in the field of a magnetic vortex, and find that there are just two self-adjoint extensions of the Hamiltonian that are compatible with the standard N = 2 supersymmetry. We show that only in these two cases one of the subsystems coincides with the original spinless Aharonov-Bohm model and comes accompanied by the super-partner Hamiltonian which allows a singular behavior of the wave functions. We find a family of additional, nonlocal integrals of motion and treat them together with local supercharges in the unifying framework of the tri-supersymmetry. The inclusion of the dynamical conformal symmetries leads to an infinitely generated superalgebra, that contains several representations of the superconformal osp(2∣2) symmetry. We present the application of the results in the framework of the two-body model of identical anyons. The nontrivial contact interaction and the emerging N = 2 linear and nonlinear supersymmetries of the anyons are discussed. 相似文献
24.
We study the well-posedness and long-time behavior of solution to both defocusing and focusing nonlinear Schr?dinger equations with scaling critical magnetic potentials in dimension two.In the defocusing case, and under the assumption that the initial data is radial, we prove interaction Morawetz-type inequalities and show the scattering holds in the energy space. The magnetic potential considered here is the Aharonov–Bohm potential which decays likely the Coulomb potential |x|~(-1). 相似文献
25.
Paulina Marian Tudor A. Marian 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2000,11(2):257-265
We analyze the transient nonclassical behaviour of a single-mode field whose interaction with an environment is governed by
the quantum optical master equation. Our analytic method makes use of the generalized characteristic function of the field
state. First, we find a time at which all squeezing effects disappear by decoherence regardless of the initial state of the
mode. In the case of an input even coherent state, an unusual modification of higher-order squeezing at low values of thermal
mean occupancy transferred to the field is found and discussed. For the same initial state, we also perform a comprehensive
analysis of the mixing process during the interaction with the reservoir. We prove that a maximum in the evolution of the
2-entropy of the attenuated mode exists on condition that its initial mean photon number exceeds the mean occupancy of the
reservoir. This transient mixing enhancement can be considered as a quantum effect of the initial state on the mode damping.
Received 22 April 1999 and Received in final form 2 November 1999 相似文献
26.
We study the dynamics of classical and quantum particles moving in a punctured plane under the influence of a homogeneous magnetic field and driven by a time-dependent singular flux tube through the hole. 相似文献
27.
The equations of the electromagnetic sector of the Evans field theory are given in terms of differential geometry and are based on the well-known structure relations and Bianchi identities. The equations thus complete Einstein’s basic axiom, that physics is derived from geometry, and extend the axiom to electrodynamics. Precise tests are suggested for the theory using the interaction of circularly polarized electromagnetic radiation with a non-relativistic electron beam. These tests include; the inverse Faraday effect (IFE), radiatively induced fermion resonance (RFR), and the electromagnetic Aharonov-Bohm (EMAB) effect. 相似文献
28.
C.P. Sun D.L. Zhou S.X. Yu X.F. Liu 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2001,13(1):145-155
Based on the Born-Oppenhemer approximation, the concept of adiabatic quantum entanglement is introduced to account for quantum
decoherence of a quantum system due to its interaction with a large system of one or a few degrees of freedom. In the adiabatic
limit, it is shown that the wave function of the total system formed by the quantum system plus the large system can be factorized
as an entangled state with correlation between adiabatic quantum states and quasi-classical motion configurations of the large
system. In association with a novel viewpoint about quantum measurement, which has been directly verified by most recent experiments
[e.g., S. Durr et al., Nature 33, 359 (1998)], it is shown that the adiabatic entanglement is indeed responsible for the quantum decoherence and thus can
be regarded as a “clean” quantum measurement when the large system behaves as a classical object. By taking the large system
respectively to be a macroscopically distinguishable spatial variable, a high spin system and a harmonic oscillator with a
coherent initial state, three illustrations are presented with their explicit solutions in this paper.
Received 26 February 2000 and Received in final form 14 July 2000 相似文献
29.
The persistent current and transmission of two connected Aharonov-Bohm rings coupled to external leads are solved analytically. The conditions on which we may observe persistent current, zero or perfect transmission as well as Fano resonance are studied. 相似文献
30.
We study the Dirac oscillator problem in the presence of the Aharonov-Bohm effect with the harmonic potential in commutative and noncommutative spaces in S = V and S =-V symmetry limits. We calculate exact energy levels and the corresponding eigenfunctions by the Nikiforov-Uvarov(NU) method and report the impact of the spin and the magnetic flux on the problem. Helpful numerical data is included. 相似文献