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

Article

关键词: EXPONENTIAL OPERATORS;    QUANTUM;    DECOMPOSITION;   

DOI  :  10.1103/PhysRevB.92.125441

来源: SCIE

【 摘 要 】

We investigate the scattering of awave 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.

【 授权许可】

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