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New sum rules for an electron in a periodic or nearly periodic potential
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New sum rules for an electron in a periodic or nearly periodic potential
classification
cond-mat
keywords
periodicrulesnearlypotentialapplyassociatedatomicband
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I derive new sum rules for the electronic oscillator strengths in a periodic or nearly periodic potential, which apply within a single energy band and between any two bands. The physical origin of these sum rules is quite unlike that of conventional sum rules, and is shown to be associated with a solid-state counterpart to the principle of spectroscopic stability known in atomic physics.
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