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Electron Optics in Phosphorene pn Junctions: Negative Reflection and Anti-Super-Klein Tunneling
journal contribution
posted on 2019-10-15, 20:14 authored by Yonatan Betancur-Ocampo, François Leyvraz, Thomas StegmannBallistic
electrons in phosphorene pn junctions show optical-like
phenomena. Phosphorene is modeled by a tight-binding Hamiltonian that
describes its electronic structure at low energies, where the electrons behave in the armchair direction
as massive Dirac Fermions and in the orthogonal zigzag direction as
Schrödinger electrons. Applying the continuum approximation,
we derive the electron optics laws in phosphorene pn junctions, which
show very particular and unusual properties. Because of the anisotropy
of the electronic structure, these laws depend strongly on the orientation
of the junction with respect to the sublattice. Negative and anomalous
reflection are observed for tilted junctions, whereas the typical
specular reflection is found only if the junction is parallel to the
zigzag or armchair edges. Moreover, omni-directional total reflection,
called anti-super-Klein tunneling, is observed if the junction is
parallel to the armchair edge. Applying the nonequilibrium Green’s
function method on the tight-binding model, we calculate numerically
the current flow. The good agreement of both approaches confirms the
atypical transport properties, which can be used in nanodevices to
collimate and filter the electron flow or to switch its direction.
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Negative ReflectionAnti-Super-Klein Tunneling Ballistic electronsPhosphorene pn Junctionsorthogonal zigzag directionelectron Opticscontinuum approximationtight-binding modelarmchair edgestransport propertiesarmchair directionphosphorene pn junctions show optical-like phenomenaarmchair edgespecular reflectionphosphorene pn junctionsanti-super-Klein tunnelingDirac Fermionselectron optics lawselectron flow
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