Stark effect tunable terahertz transitions in finite carbon chains

TL;DR

This paper demonstrates how the Stark effect can be used to tune terahertz-range optical transitions in finite carbon chains, with potential applications in tunable THz devices.

Contribution

It introduces a tight-binding model to analyze Stark effect-induced tunability of optical transitions in gold-terminated carbyne chains.

Findings

Edge-state gap and optical transition strength are tunable via the Stark effect.

Long chains exhibit dipole transitions within the THz frequency range.

Optical properties can be controlled by electric field in finite carbon chains.

Abstract

We employ a tight-binding model to calculate the optical selection rules of gold-terminated carbyne chains in the presence of an applied electric field. We show that both the magnitude of the edge-state gap and the strength of optical transitions across it can be tuned via the Stark effect. In the case of sufficiently long carbyne chains, the dipole transitions between edge states occur within the THz frequency range.