Superlattice properties of semiconductor nanohelices in a transverse electric field

TL;DR

This paper explores how semiconductor nanohelices in a transverse electric field exhibit superlattice-like electronic properties, enabling tunable high-frequency device applications through field-controlled periodic potentials.

Contribution

It demonstrates that nanohelices under an electric field behave like superlattices with controllable parameters, revealing new opportunities for device engineering.

Findings

Electronic properties mimic semiconductor superlattices.

Energy gaps open at superlattice Brillouin zone edges.

Potential for tunable high-frequency devices.

Abstract

A charge carrier confined in a quasi-one-dimensional semiconductor helical nanostructure in the presence of an electric field normal to the axis of the helix is subjected to a periodic potential proportional to the strength of the field and the helix radius. As a result, electronic properties of such nanohelices are similar to those of semiconductor superlattices with parameters controlled by the applied field. These properties include Bragg scattering of charge carriers by a periodic potential, which results in energy gap opening at the edge of the superlattice Brillouin zone. This provides an opportunity for creating a new class of tunable high-frequency devices based on semiconductor nanohelices.