Effect of parallel magnetic field on Klein tunneling in pn and pnp graphene trilayer junctions

2022/08/31 by Mouhafid, Abderrahim El, Jellal, Ahmed
#FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Quantum Physics (quant-ph)

paper · doi:10.48550/arxiv.2208.14969

Abstract

The effect of a parallel magnetic field B and a potential substrate on the transmission, conductivity, and Fano factor of a biased ABC-stacked pn and pnp trilayer graphene junction (ABC-TLG) is investigated theoretically at low energy. We discovered that, in the presence of a high magnetic field B=1400T, the ABC-TLG can exhibit new Klein tunneling at two new incidence k_y values, in addition to the usual value of k_y=0 and whatever the energy value is. Indeed, the transmission of ABC-TLG via pn and pnp junctions is transformed into a three-separate transmission of single-like graphene (SLG), with Klein tunneling appearing at k_y=0 and k_y=±κ (κ is highly dependent on B). Furthermore, the conductivity σ and Fano factor F behave similarly to SLG, with ABC-TLG having the lowest σ=3g₀/π and highest F=1/3 at B=1400T and σ_TLG=3σ_SLG.

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