Huang Xiang-You

The experiment on the saturation polarization of Rb vapour

A cylindrical capacitor containing rubidium vapour is made. The capacitance of it at different voltages is measured under a certain Rb vapour pressure. The experimental C–V curve shows that the saturation polarization of Rb vapour is easily observed. The experiment further supports the idea that the Rb atom has a large permanent electric dipole moment.

Permanent Electric Dipole Moment of an Rb Atom

We experimentally determine the conjecture that hydrogen-like atoms such as Rb and Cs may have large permanent electric dipole moments (EDMs). The saturated Rb vapour fills a cylindrical capacitor in the experiment. The influence of the vapour dielectric medium on capacitance is measured with a digital capacitance meter. Supposing that the measurement influence comes from the permanent EDMs of Rb atoms, from the experimental result we find that the EDM is large, i.e. dRb≥8.6e×10-9 cm.

Quantum Phase of a Moving Dipole and Berry's Phase

The quantum phase of a moving dipole as it encircles an infinite line of magnetic charge, recently discovered by Wilkens (Phys. Rev. Lett. 72 (1994) 5), is derived as a special case of Berrys phase.

Double wave description of single particle in an infinitely deep square potential well

Recently we have suggested that the state of a single particle should be jointly defined by two wave functions. In this letter we use this suggestion to discuss the motion of a single particle in an infinitely deep square potential well; the results obtained in the classical limit correctly describe the motion of the single particle with clarity.

New treatment of quantum revivals

When a real system consisting of a two-level atom and a single-mode field is described by a pair of state vectors, the energy of the atom shows a stationary cosine oscillation. When this energy is averaged over an ensemble, we get the usual periodic decays and revivals of the mean value of the energy.

A proposed new description of linear oscillators

A suggestion to define the state of an oscillator by two wave functions is proposed. These two functions can be combined to completely describe the motion of the oscillator. In this description, both the energy and the phase of the oscillator simultaneously have definite values. The usual theory of oscillators is a statistical case of the new description.

Reply to Comment on ``Permanent Electric Dipole Moment of an Rb Atom''

The result of our experiment on Rb atoms is interesting and surprising. To affirm or to refuse the result should not be by conjectures but by experiments.

Time Eigenvectors and Their Applications

Time eigenvectors and time operator are constructed from energy eigenvectors of system. Some features of them are described. Their applications to harmonic oscillating system and to double wave description of system are discussed.

Classical Limits of Distribution Functions for Stationary Systems

Homogeneous ensembles are introduced and their distribution functions in phase space are given. A comparison between these distribution functions and those obtained from quantum stationary systems is made. It is shown that the quantum stationary systems are completely equivalent to homogeneous ensembles in the classical limit.