Electronic cloaking of confined states in phosphorene junctions

Abstract

We study the electronic transport of armchair and zigzag gated phosphorene junctions. We find confined states for both direction-dependent phosphorene junctions.In the case of armchair junctions confined states are reflected in the transmission properties as Fabry-Pérot resonances at normal and oblique incidence. In the case of zigzag junctions confined states are invisible at normal incidence, resulting in a null transmission. At oblique incidence Fabry-Pérot resonances are presented in the transmission as in the case of armchair junctions. This invisibility or electronic cloaking is related to the highly direction-dependent pseudospin texture of the charge carriers in phosphorene. Electronic cloaking is also manifested as a series of singular peaks in the conductance and as inverted peaks in the Seebeck coefficient. The characteristics of electronic cloaking are also susceptible to the modulation of the phosphorene bandgap and an external magnetic field. So, electronic cloaking in phosphorene junctions in principle could be tested through transport, thermoelectric or magnetotransport measurements.Cloaking effect consists in making objects invisible to radiation, acoustic waves, matter waves, heat and charge fluxes, among others [1][2][3][4]. The typical cloaking effect is based on guiding plane waves around an object. The effect also refers to hiding an object in space.Cloaking effect is a phenomenon that can have a plethora of applications such as mantle cloaking, antennas, invisible sensors that do not perturb the field that they measure, etc. [1].With the arrival of 2D materials, in particular graphene, there were reports of the cloaking effect in bilayer graphene junctions [5][6][7] and graphene nanoribbons [8]. Experimental evi- *