Dwell time in graphene-based magnetic barrier nanostructures

作者：Gong Yiyang; Guo Yong^*

来源：Journal of Applied Physics, 2009, 106(6): 064317.

DOI：10.1063/1.3225914

The authors have investigated the dwell time of electrons tunneling through nonuniform magnetically modulated graphene monolayer. Two types of models, i.e., the square magnetic barrier and the delta-function magnetic barrier, are introduced to simulate the magnetic modulation realized by depositing nanoscale ferromagnetic stripes on top of the graphene monolayer. It is found that both the dwell time and the transmission probability show remarkable anisotropy that varies in different magnetically modulated configurations. Particularly, when the electrons tunnel through the graphene monolayer modulated by two antiparallelly aligned ferromagnetic stripes, the corresponding transmission probability exhibits angularly symmetric property, whereas the dwell time does not. Moreover, there exists great discrepancy of the dwell time between in the Klein tunneling region and in the resonant tunneling region, where each region corresponds to the perfect transmission peaks.

• 出版日期2009-9-15
• 单位清华大学