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Effect of the ratio of transition dipole moments on few-cycle pulse propagation

Chinese Optics Letters 2008年第8期6卷 607-610页

作者：谭霞杨艳玲仝殿民樊锡君 College of Physics and Electronics Shandong Normal University

Propagation of a few-cycle laser pulses in a dense V-type three-level atomic medium is investigated based on full-wave Maxwell-Bloch equations by taking the near dipole-dipole （NDD） interaction into account. We find that the ratio, γ of the transition dipole moments has strong influence on the time evolution and split of the pulse： when γ≤ 1, the NDD interaction delays propagation and split of the pulse, and this phenomenon is more obvious when the value of γ is smaller; when γ =√2, the NDD interaction accelerates propagation and split of the pulse.

关键词： electric dipole moments Maxwell equations Molecular vibrations Wave equations

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Nanoscale displacement of the image of an atomic source of radiation

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Chinese Optics Letters 2009年第2期7卷 149-151页

作者： Henk F. Arnoldus Department of Physics and Astronomy Mississippi State University

Light emitted by an atomic source of radiation appears to travel along a straight line （ray） from the location of the source to the observer in the far field. However, when the energy flow pattern of the radiation is resolved with an accuracy better than an optical wavelength, it turns out that the field lines are usually curved. We consider electric dipole radiation, a prime example of which is the radiation emitted by an atom during an electronic transition, and we show that the field lines of energy flow are in general curves. Near the location of the dipole, the field lines exhibit a vortex structure, and in the far field they approach a straight line. The spatial extension of the vortex in the optical near field is of nanoscale dimension. Due to the rotation of the field lines near the source, the asymptotic limit of a field line is not exactly in the radially outward direction and as a consequence, the image in the far field is slightly shifted. This sub-wavelength displacement of the image of the source should be amenable to experimental observation with contemporary nanoscale-precision techniques.

关键词： Atoms electric dipole moments Flow patterns Nanotechnology Vortex flow

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On the Neutron electric dipole Moment

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Chinese Physics Letters 2004年第8期21卷 1463-1466页

作者： Z.Bentalha O.Lazrec LaboratoryofTheoreticalPhysics UniversityofTlemcenTlemcenAlgeria MohammedVUniversity TheoreticalPhysicsLaboratoryRabatMorocco

Within the Kobayashi–Maskawa mechanism of electroweak interaction and using the recent measured mass of the top quark, we estimate the neutron electric dipole moment (NEDM) via the diquark electroweak interaction. The resulting moment is about 10−30ecm. The actual upper bound on the NEDM is 6.3×10−26ecm and it can reach the value 5×10−28ecm predicted by experiments in recent years.

关键词： electric dipole moments

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Different entanglement dynamics and transfer behaviors due to dipole-dipole interaction

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Chinese Optics Letters 2012年第10期10卷 5-9页

作者：崔得凯张英杰满忠晓夏云杰 Shandong Provincial Key Laboratory of Laser Polarization and Information Technology Department of PhysicsQufu Normal University

We analyze entanglement dynamics and transfer in a system composed of two initially correlated two-level atoms, in which each atom is coupled with another atom interacting with its own reservoir. Considering atomic dipole-dipole interactions, the results show that dipole-dipole interactions restrain the entanglement birth of the reservoirs, and a parametric region of dipole-dipole interaction strength exists in which the maximal entanglement of two initially uncorrelated atoms is reduced. The transfer of entanglement shows obvious different behaviors in two initial Bell-like states.

关键词： Atoms dipole moment Dynamics electric dipole moments

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Comment on “Permanent electric dipole Moment of an Rb Atom”

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Chinese Physics Letters 2003年第7期20卷 1187-1187页

作者：朱振和 DepartmentofPhysics CentralUniversityfornationalitiesBeijing100081

It is stated that the conjecture that the hydrogen-like atoms may have large permanent electric dipole moments is doubtable. Two kinds of experiments are suggested to check the reliability of the conjecture further.

关键词： electric dipole moments

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