交-直流势驱动下的应力石墨烯势垒中Dirac粒子的隧穿

The tunneling of the Dirac particle through the static and time-periodic graphene barrier under the strain

研究了应力作用下单层石墨烯在含时电势垒中Dirac粒子的隧穿.通过改变势垒中交流势垒的强度、粒子的入射角、沿zigzag或armchair方向施加的应力等详细探讨了Dirac粒子经由中心带和边带的透射率.用数值计算证明了垂直入射时Klein遂穿是通过Dirac粒子经由各个边带的透射率的迭加而完全穿过受应力作用和交-直流势驱动下的势垒.一般情况下,增加交流势垒的强度会对透射产生抑制,但是,沿zigzag方向施加应力有利于Dirac粒子经由边带的透射而抑制经由中心带的透射.

The tunneling of the Dirac particle through the strained graphene stripes driven by the static and dynamic potentials has been investigated. The central and neighboring sidebands transmissions have been obtained and compared under the different incident angles, the strength of time-periodic potentials and the strains exerted along respectively the armchair and zigzag directions. The detailed numerical results show that the well-known normal-incidence Klein tunneling can be realized through the superposition of the transmissions from each sideband channels. The increase of the strength of time-periodic potentials can usually lead to the suppression of the transmission from the central band, but the enhancement of the transmission from the side channels, when the strain is exerted along the zigzag direction.