The spin-orbit interaction enhanced terahertz absorption in graphene around the K point

Elsevier Ltd
Publication Type:
Journal Article
Microelectronics Journal, 2009, 40 (4-5), pp. 857 - 859
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We present a quantitative analysis on the effect of the spinorbit interaction in the optical absorption of ?-electrons in graphene. It has been shown that the optical absorption amplitude of graphene around the K point in the Brillouin zone has a node in the two-dimensional Brillouin zone of honeycomb lattice. We calculated the k-dependent absorption matrix by taking into account the finite spinorbit interaction in graphene. It was found that the spinorbit interaction lifts the nodes in the absorption matrix. Furthermore, in the terahertz frequency regime, the spinorbit interaction can significantly enhance the optical absorption in graphene, by up to 100%.
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