Antiresonance in Transmission through a Heterojunction Formed by Topological Nodal‐Line Semimetals

Quantum transmission through a heterojunction formed by two types of nodal‐line semimetals is investigated. Results show that the initial energy and energy range of the quantum transmission can be modulated efficiently when the barrier region demonstrates its different energy‐band properties. Antiresonance points can also appear in the transmission function spectra. Moreover, if the barrier is parallel to the basal planes of the nodal‐line semimetals, one gap appears in the transmission function spectrum instead of the normal antiresonance point. In addition, the Klein tunneling displays new characteristics in such a heterojunction. All these results provide useful information for adjusting the transmission behaviors in the heterojunctions of nodal‐line semimetals. In a heterojunction formed by two types of nodal‐line semimetals, quantum transmission is efficiently modulated when the barrier region demonstrates different energy‐band properties. This is manifested as the appearance of antiresonance points or one gap in the transmission spectra, determined by the relation between the barrier and basal planes. Additionally, Klein tunneling displays new characteristics in this heterojunction.