Valley current filtering and reversal by parallel side contacted armchair nanotubes

TL;DR

This paper investigates how the intertube conductance in parallel side contacted armchair nanotubes depends on the Fermi level, revealing resonant peaks that can reverse and filter valley currents regardless of overlap length or configuration.

Contribution

It demonstrates that intervalley transmission at resonance can reverse and filter valley currents, independent of geometric factors, advancing understanding of valleytronics in nanotubes.

Findings

Resonant peaks dominate the conductance at certain Fermi levels.

Intervalley transmission can reverse valley current direction.

Resonant behavior is unaffected by overlap length or interlayer configuration.

Abstract

The intertube conductance $G$ of the parallel side contacted armchair nanotubes is calculated by Landauer's formula as a function of the Fermi level $E$. When the intertube difference in the dope strength is large enough, a resonant peak dominant over the others appears in the $E$-$G$ curve. The overlap length and the interlayer configuration do not influence the resonant energy. The intervalley transmission at the resonant peak works as a reverser and a filter of the valley current.