Transmission phase lapses at zero energy in graphene quantum dots
2014
We address theoretically the electronic transport through graphene quantum dots with the emphasis on the transmission phase. Analytical and numerical results are presented regarding the existence – or not – of a π lapse of the transmittance phase (and, consequentially, a Fano zero in the transmittance) at the charge neutrality point. A simple universal criterium is found, the phase lapses being always present if the contact sites belong to the same sub-lattice. (© 2014 WILEY-VCH Verlag GmbH &Co. KGaA, Weinheim)
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