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In this work, we study the electronic and transport properties of phosphorenenanorings in two perpendicular directions (zigzag and armchair directions) inthe presence of zigzag metallic source and drain leads. Our results are basedon the non-equilibrium Green's function (NEGF) method and a five-parametertight-binding (TB) approach. We investigate how system parameters affect theelectronic transport. These parameters include the radius of the rings, thewidth of the leads and the external potential. Our results show that for allconfigurations studied, a transport energy gap exists whose width can be tunedby the width of the leads and the radius of the nanoring. The transmissionfunction of wider leads shows more sensitivity to the variation of the innerradius due to higher electronic states that can respond to smaller changes inthe scattering region. In addition, the transport along the armchair directionis more susceptible to tuning than the transport along the zigzag direction.The effects of external potentials on the conductance are more pronounced thanthe geometrical parameters. In particular the circular potential of theamplitude of 0.1 eV can widen the transport gap by about ~0.35 eV.

journal of applied physics

Insights into electronic and transport properties of phosphorene  nanorings in two perpendicular directions: Effects of circular and elliptical  external potentials