Temperature effect in the conductance of hydrogen molecule

TL;DR

This paper investigates how temperature influences the conductance of a hydrogen molecule bridging platinum electrodes, highlighting the role of electron-phonon interactions and their effects on conductance behavior.

Contribution

It provides a many-body calculation of temperature-dependent conductance in a hydrogen molecular junction, emphasizing the impact of electron-phonon interactions.

Findings

Conductance peaks near the quantum unit G0 at low temperatures.

Temperature dependence of conductance follows a 1/4T cosh^2((eV - ω0)/2T) pattern.

Electron-phonon interactions cause characteristic features in I-V dependence.

Abstract

We present a many-body calculation for the conductance of a conducting bridge of a simple hydrogen molecule between $Pt$ electrodes.The experimental results showed that the conductance $G=dI/dV$ has the maximum value near the quantum unit $G_{0}=2e^{2}/h$. The $I-V$ dependence presents peak and dip and we consider that the electron-phonon interaction is responsible for this behavior. At T=0 there is a step in this dependence for the energy of phonons $\omega_{0}$ which satisfies $eV=\omega_{0}$. We calculated the conductance at finite temperature and showed that $dG(T)/dV\propto 1/4T\cosh^{2}\frac{eV-\omega_{0}}{2T}$.