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C. D. Xiong

Publications and source records attributed to C. D. Xiong.

5 recordsLinked to original sources
arXiv2011

Time as a Dynamical Variable

There are enough reasons for us to consider time as a dynamical variable or operator; but according to Pauli's argument the existence of a self-adjoint time operator is incompatible with the semi-boundedness of Hamiltonian spectrum. In this article, we study the expressions of time operator and the definitions of mean time from a general and new viewpoint, make a new comment on Pauli's objections, and clarify some possible confusion in existing theories of time in quantum mechanics. From which we try to provide a new gateway for the conundrum of time in quantum mechanics and reconstruct a unified foundation for some issues of time.

quant-ph↗
arXiv2006

Superluminal Behaviors of Electromagnetic Near-fields

Superluminal phenomena have been reported in many experiments of electromagnetic wave propagation, where the superluminal behaviors of evanescent waves are the most interesting ones with the important physical significances. Consider that evanescent waves are related to the near-zone fields of electromagnetic sources, based on the first principles, we study the group velocities of electromagnetic fields in near-field region, and show that they can be superluminal, which can provide a heuristic interpretation for the superluminal properties of evanescent waves.

physics.optics↗
arXiv2005

General Electrical Manipulations of Electron Spin

Traditionally, the interactions related to the 3D spatial angular momentum have been studied completely, while the ones related to the generators of Lorentz boost are always ignored. In this paper we show that the generators of Lorentz boost have a nontrivial physical significance in quantum mechanics, and try to propose a most general theory about electrical manipulations of electron spin, where a new treatment and interpretation for the traditional Darwin term and spin-orbit coupling is given via the concept of electron's induced electric moment. Some electrostatic fields can even affect the spin quantum states of a resting electron, and parallel electric and magnetic fields can be simultaneously applied to fix on the spin orientation of electron.

cond-mat.other↗
arXiv2004

A Theoretical Investigation of Relativistic Spintronics

Spintronics directly based on relativistic quantum mechanics is called as relativistic spintronics, which involves the study of active control and manipulation of 4D spin-tensor degrees of freedom via the electromagnetic field tensor. For future potential electronic devices with smaller size, the study of relativistic spintronics would be valuable. In this paper, we try to establish a general theoretical basis for relativistic spintronics, from which we have: 1) in relativistic spintronics, there have more plentiful contents for relativistic effects, e.g. the usual 3D spatial spin-orbit coupling is extended to the 4D spin-orbit-tensor coupling; 2) via the spin and like-spin degrees of freedom we can simultaneously make use of electric and magnetic field strengths to orientate an electron; 3) not only the spin quantum states of a moving electron but also those of a motionless electron can be affected by some particular electrostatic fields.

cond-mat.other↗