Energy shift and conduction-to-valence band transition mediated by a time-dependent potential barrier in graphene

Andrey Chaves, D. R. Da Costa, G. O. De Sousa, J. M. Pereira, G. A. Farias

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

We investigate the scattering of a wave packet describing low-energy electrons in graphene by a time-dependent finite-step potential barrier. Our results demonstrate that, after Klein tunneling through the barrier, the electron acquires an extra energy which depends on the rate of change of the barrier height with time. If this rate is negative, the electron loses energy and ends up as a valence band state after leaving the barrier, which effectively behaves as a positively charged quasiparticle.

Original languageEnglish (US)
Article number125441
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number12
DOIs
StatePublished - Sep 28 2015
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2015 American Physical Society. ©2015 American Physical Society.

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