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

doi:10.1103/PhysRevB.92.125441

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

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9 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 language	English (US)
Article number	125441
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	92
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevB.92.125441
State	Published - Sep 28 2015
Externally published	Yes

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© 2015 American Physical Society. ©2015 American Physical Society.

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AU - Da Costa, D. R.

AU - De Sousa, G. O.

AU - Pereira, J. M.

AU - Farias, G. A.

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

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