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We have studied far infrared transmission spectra of alpha'-NaV2O5 between 3and 200cm-1 in polarizations of incident light parallel to a, b, and ccrystallographic axes in magnetic fields up to 33T. The triplet origin of anexcitation at 65.4cm-1 is revealed by splitting in the magnetic field. Themagnitude of the spin gap at low temperatures is found to be magnetic fieldindependent at least up to 33T. All other infrared-active transitions appearingbelow Tc are ascribed to zone-folded phonons. Two different dynamicDzyaloshinskii-Moriya (DM) mechanisms have been discovered that contribute tothe oscillator strength of the otherwise forbidden singlet to triplettransition. 1. The strongest singlet to triplet transition is an electricdipole transition where the polarization of the incident light's electric fieldis parallel to the ladder rungs, and is allowed by the dynamic DM interactioncreated by a high frequency optical a-axis phonon. 2. In the incident lightpolarization perpendicular to the ladder planes an enhancement of the singletto triplet transition is observed when the applied magnetic field shifts thesinglet to triplet resonance frequency to match the 68cm-1 c-axis phononenergy. The origin of this mechanism is the dynamic DM interaction created bythe 68cm-1 c-axis optical phonon. The strength of the dynamic DM is calculatedfor both mechanisms using the presented theory.Comment: 21 pages, 22 figures. Version 2 with replaced fig. 18 were labels had  been los

physical review. b, condensed matter and materials physics

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Low-energy excitations and dynamic Dzyaloshinskii-Moriya interaction inα′−NaV2O