Abstract：
:We investigate theoretically the two-photon absorption (TPA) for circular graphene quantum dots (GQDs) with the edge of armchair and zigzag on the basis of electronic energy states obtained by solving the Dirac-Weyl equation numerically under finite difference method. The expressions for TPA cross section are derived and the transition selection rules are obtained. Results reveal that the TPA is significantly greater in GQDs than conventional semiconductor QDs in infrared spectrum (2-6 um) with a resonant TPA cross section of up to 10(11 )GM. The TPA peaks are tuned by the GQDs' size, edge and electron relaxation rate.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Feng X,Li Z,Li X,Liu Ydoi
10.1038/srep33260subject
Has Abstractpub_date
2016-09-15 00:00:00pages
33260issn
2045-2322pii
srep33260journal_volume
6pub_type
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