Excitonic Effects on the Optical Response of Graphene and Bilayer Graphene Export

@article{citeulike:4755714, abstract = {We present first-principles calculations of many-body effects on the optical response of graphene and bilayer graphene employing the GW-Bethe Salpeter equation approach. We find that because of electron-hole interactions, resonant excitons are formed in these two-dimensional semimetals. These give rise to a prominent peak in the absorption spectrum near 4.5 eV with a different lineshape and significantly red-shifted peak position from those of an absorption peak arising from inter-subband transitions in an independent quasiparticle picture. In the infrared-frequency regime, our calculated optical absorbance per graphene layer is approximately a constant, 2.4\%, in good agreement with recent experiments; additional low frequency features are found for bilayer graphene owing to its band structure.}, archivePrefix = {arXiv}, author = {Yang, Li and Deslippe, Jack and Park, Cheol-Hwan and Cohen, Marvin L. and Louie, Steven G.}, citeulike-article-id = {4755714}, citeulike-linkout-0 = {http://arxiv.org/abs/0906.0969}, citeulike-linkout-1 = {http://arxiv.org/pdf/0906.0969}, comment = {How does a field effect these results? Amir Yacoby's group has data on the dc transport properties at nu=0, which Subir and Ganpathy think can be explained using as due to fluctuations of a continuum quantum hall ferromagnet. Yafis Baras has some specific Hartree-Fock calculations arguing that at nu=0 the system is a ferromagnet of real spin.}, day = {4}, eprint = {0906.0969}, keywords = {bilayer, graphene}, month = {Jun}, posted-at = {2009-06-05 21:20:12}, priority = {2}, title = {Excitonic Effects on the Optical Response of Graphene and Bilayer Graphene}, url = {http://arxiv.org/abs/0906.0969}, year = {2009} }

TY - JOUR ID - citeulike:4755714 L3 - citeulike-article-id:4755714 N2 - We present first-principles calculations of many-body effects on the optical response of graphene and bilayer graphene employing the GW-Bethe Salpeter equation approach. We find that because of electron-hole interactions, resonant excitons are formed in these two-dimensional semimetals. These give rise to a prominent peak in the absorption spectrum near 4.5 eV with a different lineshape and significantly red-shifted peak position from those of an absorption peak arising from inter-subband transitions in an independent quasiparticle picture. In the infrared-frequency regime, our calculated optical absorbance per graphene layer is approximately a constant, 2.4%, in good agreement with recent experiments; additional low frequency features are found for bilayer graphene owing to its band structure. TI - Excitonic Effects on the Optical Response of Graphene and Bilayer Graphene KW - bilayer KW - graphene N1 - How does a field effect these results? Amir Yacoby's group has data on the dc transport properties at nu=0, which Subir and Ganpathy think can be explained using as due to fluctuations of a continuum quantum hall ferromagnet. Yafis Baras has some specific Hartree-Fock calculations arguing that at nu=0 the system is a ferromagnet of real spin. AU - Yang, Li AU - Deslippe, Jack AU - Park, Cheol-Hwan AU - Cohen, Marvin AU - Louie, Steven PY - 2009/Jun/04/ UR - http://arxiv.org/abs/0906.0969 ER -