Spin Current and Shot Noise in Single-Molecule Quantum Dots with a Phonon Mode

TL;DR

This paper studies how a local phonon mode affects spin current and shot noise in a single-molecule quantum dot, revealing phonon-induced features in shot noise spectra and their dependence on electron-phonon coupling.

Contribution

It provides new insights into the influence of phonon modes on spin-dependent quantum transport and shot noise in molecular quantum dots.

Findings

Phonon modes significantly affect zero-frequency shot noise.

Electron-phonon interaction creates sideband peaks at phonon frequencies.

Peak heights are sensitive to electron-phonon coupling strength.

Abstract

In this paper we investigate the spin-current and its shot-noise spectrum in a single-molecule quantum dot coupled with a local phonon mode. We pay special attention on the effect of phonon on the quantum transport property. The spin-polarization dependent current is generated by a rotating magnetic filed applied in the quantum dot. Our results show the remarkable influence of phonon mode on the zero-frequency shot noise. The electron-phonon interaction leads to sideband peaks which are located exactly on the integer number of the phonon frequency and moreover the peak-height is sensitive to the electron-phonon coupling.