Berry phase and traversal time in asymmetric graphene structures |
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Authors: | Daniela Dragoman |
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Institution: | University of Bucharest, Physics Department, P.O. Box MG-11, Bucharest 077125, Romania |
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Abstract: | The Berry phase and the group-velocity-based traversal time have been calculated for an asymmetric non-contacted or contacted graphene structure, and significant differences have been observed compared to semiconductor heterostructures. These differences are related to the specific, Dirac-like evolution law of charge carriers in graphene, which introduces a new type of asymmetry. When contacted with electrodes, the symmetry of the Dirac equation is broken by the Schrödinger-type electrons in contacts, so that the Berry phase and traversal time behavior in contacted and non-contacted graphene differ significantly. |
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