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Dynamic zero balance of the oscillator-strength sum in graphene

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Abstract

We investigate the relativistic zero balance of the oscillator strength sum rule in a single-layer graphene. The full energy-dependent characteristics are studied by ultrafast THz spectroscopy to probe the low-energy quasi-free absorption oscillator in conjunction with ultrafast optical spectroscopy to investigate the high-energy oscillator near Fermi level.

© 2013 Optical Society of America

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