Power and group velocity

Details Power and group velocity Power and group velocity

2006-02-03

arxiv.org/abs/cond-mat/0602083v1

Physics

Condensed Matter

Materials Science

Scientific paper

Here we make use of the Hellmann-Feynman theorem, with the aim to calculate
macroscopic quantum velocities instead of forces, and we show how it is
possible to derive the expression of the work per unit time, per unit volume
(power density) done by a static external uniform electromagnetic field
interacting with a quantal body.

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