We study the tunneling time of Dirac fermions in graphene magnetic barrier through an electrostatic potential and a mass term. This latter generates an energy gap in the spectrum and therefore affects the proprieties of tunneling of the system. For clarification, we first start by deriving the eigenspinors solutions of Dirac equation and second connect them to the incident, reflected and transmitted beam waves. This connection allows us to obtain the corresponding phases shifts and consequently compute the group delay time in transmission and reflection. Our numerical results show that the group delay time depends strongly on the energy gap in the tunneling process through single barrier. Moreover, we find that the group approaches unity at some critical value of the energy gap and becomes independent to the strengths of involved physical parameters.

我们通过静电势和质量项研究了石墨烯磁势垒中狄拉克费米子的隧穿时间。后者在光谱中产生能隙，因此影响系统隧穿的特性。为了澄清起见，我们首先从推导出的特征旋量解开始Dirac 方程和第二个将它们连接到入射、反射和透射光束波。这种连接使我们能够获得相应的相移，从而计算传输和反射中的群延迟时间。我们的数值结果表明，群延迟时间在很大程度上取决于通过单个势垒的隧穿过程中的能隙。此外，我们发现该组在能隙的某个临界值处接近统一，并且与所涉及的物理参数的强度无关。