Phonon interference effects in molecular junctions

Phonon interference effects in molecular junctions.

We study coherent phonon transport through organic, π-conjugated molecules. Using first principles calculations and Green's function methods, we find that the phonon transmission function in cross-conjugated molecules, like meta-connected benzene, exhibits destructive quantum interference features very analogous to those observed theoretically and experimentally for electron transport in simila...

Probing electron-phonon excitations in molecular junctions by quantum interference

Electron-phonon coupling is a fundamental inelastic interaction in condensed matter and in molecules. Here we probe phonon excitations using quantum interference in electron transport occurring in short chains of anthraquinone based molecular junctions. By studying the dependence of molecular junction's conductance as a function of bias voltage and temperature, we show that inelastic scattering...

Phonon-assisted current noise in molecular junctions.

We investigate the effects of phonon scattering on the electronic current noise through nanojunctions using the nonequilibrium Green's functions formalism extended to include the counting field. In the case of weak electron-phonon coupling and a single broad electronic level, we derive an analytic expression for the current noise at arbitrary temperature and identify physically distinct contrib...

Current-induced phonon renormalization in molecular junctions

Meilin Bai,1,2 Clotilde S. Cucinotta,2,* Zhuoling Jiang,1 Hao Wang,1 Yongfeng Wang,1,3 Ivan Rungger,2,4 Stefano Sanvito,2,* and Shimin Hou1,3,* 1Key Laboratory for the Physics and Chemistry of Nanodevices, Department of Electronics, Peking University, Beijing 100871, China 2School of Physics, Advanced Materials and Bioengineering Research Centre (AMBER) and Centre for Research on Adaptive Nanos...

Temperature effects on quantum interference in molecular junctions