A terahertz molecular switch

TL;DR

This paper demonstrates a molecular device that can act as a terahertz switch, where an electromagnetic pulse induces a rapid transition between conducting states, offering potential for nanoscale terahertz switching applications.

Contribution

The study introduces a time-dependent model of a molecular switch controlled by terahertz pulses, revealing a new mechanism for ultrafast state transitions in molecular electronics.

Findings

Terahertz pulses can induce rapid switching between current states.

A phase diagram identifies bias conditions for fast transitions.

The physical process differs from traditional photodetectors.

Abstract

We present time-dependent results describing the current through a molecular device, modeled as a complex with two active centers connected to leads under bias. We show that, at a properly adjusted external voltage, a passing terahertz electromagnetic pulse may cause a transition between states of finite and negligible current, suggesting that the system might be useful as a nanoscopic switch in the terahertz range. A phase diagram defining the bias region in which the transition takes place within a short time is given. As described, the physical processes involved are of an entirely different nature than those in ordinary photodetectors.