The Hartman effect in Weyl semimetals

Abstract

The group delay and dwell time are theoretically investigated in Weyl semimetals in the presence and absence of a magnetic field. The Hartman effect, which denotes the independence of group delay time on barrier length, is observed in Weyl semimetals when the incident angle and electron energy exceed certain critical values. We discuss the influence of the incident azimuthal angle, incident electron energy, and barrier length on the group delay time. Additionally, we found that the Hartman effect is also influenced by the magnetic field due to the direction dependence of the dwell time. This suggests some possible means to control the group delay time in applications involving Weyl semimetal-based devices.