98 citations · 700 across the 36 of their papers we have counts for
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Spinor wave equation, relativistic condition, and nonlocality of photon spin
Chun-Fang Li
The purpose of this paper is to derive the photon spin and to deduce its properties from a pair of quantum equations for the photon. To this end, Darwin's equations are reinterpret…
Deriving photon spin from relativistic quantum equations: Nonlocality of photon spin and relativistic quantum constraint
Chun-Fang Li
The difficulties encountered up till now in the theory of identifying the spin and orbital angular momentum of the photon stem from the approach of dividing the angular momentum of…
From nonholonomic quantum constraint to canonical variables of photons I: true intrinsic degree of freedom
Chun-Fang Li, Yun-Long Zhang
We report that the true intrinsic degree of freedom of the photon is neither the polarization nor the spin. It describes a local property in momentum space and is represented in th…
Quantum-mechanical description of entanglement between photon's polarization and momentum
Chun-Fang Li
It has been accepted that the polarization of the photon in vector beams is entangled with its momentum. Here a quantum description is advanced for the polarization that shows enta…
A key role of transversality condition in quantization of photon orbital angular momentum
Chun-Fang Li
The effect of the transversality condition on the quantization of the photon orbital angular momentum is studied. The quantum gauge that is deduced from the transversality conditio…
On angular momentum of photons: the role of transversality condition in quantum mechanics
Chun-Fang Li
Whether the total angular momentum of the photon can be separated into spin and orbital parts has been a long-standing problem due to the constraint of transversality condition on…