Effect of a gap opening on the conductance of graphene with magnetic barrier structures

• Published in: Physica. B, Condensed matter Vol. 534; pp. 150 - 155
• Main Author: Esmailpour, Mohammad
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.04.2018; Elsevier BV
• Subjects: Atoms & subatomic particles; Barriers; Carbon; Confining; Electron transfer; Electronic transport; Energy gap; Energy transmission; Fermions; Graphene; Magnetic barrier; Magnetic fields; Probability; Resistance; Magnetic barrier; Graphene; Electronic transport
• ISSN: 0921-4526; 1873-2135
• DOI: 10.1016/j.physb.2017.12.070

In the present study Klein tunneling in a single-layer gapped graphene was investigated by transfer matrix method under normal magnetic field for one and two magnetic barriers. Calculations show that electron transmission through a magnetic barrier is deflected to positive angles and reduces as the magnitude of magnetic field and especially the energy gap increases. This reduction is even more significant in larger fields so that after reaching a specific value of energy gap, an effective confinement for fermions and suppression of Klein tunneling is reached particularly in normal incidence and the conductance becomes zero. Unlike one barrier, the process of tunneling through two magnetic barriers induces symmetric transmission probability versus the incident angle; even, for lower energy gaps, electron transmission probability increases which in turn reduces total conductance via proper changes in the value of the magnetic field and energy gap. In general, it is concluded that confining electrons in asymmetric transmission through one barrier is conducted better than two barriers.