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Optics Express

Quantum localization in circularly polarized electromagnetic field in ultra-strong field limit

Matt Kalinski

Published Jan 15, 2001• 2 citations
Publisher

Abstract

We predict analytically and confirm numerically the existence of sharply localized quantum states in an ultra-strong circularly polarized electromagnetic field with the probability density that represents non-classical wave packets moving around strongly unstable classical circular orbits.
DOI
10.1364/oe.8.000112

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We present the quantal dynamics of electronic wave packets in the hydrogen atom in the presence of circularly polarized microwave and magnetic fields in regions of classical stability. Whereas wave packets may disperse without the stabilizing influence of a magnetic field, in its presence stable motion can be maintained for wave packets that are localized either at global equilibria that are either a maximum or minimum in a zero-velocity surface. Because these extrema are locally harmonic their vacuum states are truly coherent states in the original sense of Schr\"odinger.
A classical circularly polarized electromagnetic wave carries angular momentum, and represents the classical limit of a photon, which carries quantized spin. It is shown that a very similar picture of a circularly polarized coherent wave can account for both the spin of an electron and its quantum wave function, in a Lorentz-invariant fashion. The photon-electron interaction occurs through the usual electromagnetic potentials, modulating the frequency and wavevector (energy and momentum) of this rotating spin field. Other quantum particles can also be represented either as rotating spin fields, or as composites of such fields. Taken together, this picture suggests an alternative interpretation of quantum mechanics based solely on coherent wave packets, with no point particles present.