For , its squared projection onto the long axis of every valley is . All six valleys therefore have the same cyclotron effective mass:
(1)
At the fixed photon energy,
(2)
Thus the two-peak spectrum is replaced by one peak near . The source does not determine the linewidth or absolute oscillator strength for the new direction; the sketch below shows only a normalized illustrative line at the computed position.
Figure 1.
Silicon valley geometry and the single resonance for a field
. Original schematic. Left: six electron Fermi surface pockets near the X faces of the face-centred-cubic first Brillouin zone. Middle: a schematic hole surface about after lowering the chemical potential into the valence band; its radius and warping are not inferred from the damaged source. Right: a unit-height illustrative absorption line at the calculated resonance; the width is chosen for readability and is not predicted. Details.

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