Phonon Josephson junction with nanomechanical resonators

Date

Aug 24, 2016

Time

4:30 PM - 6:00 PM

Speaker

Shabir Barzanjeh

Affiliation

Institute of Science and Technology (IST) Austria

Language

en

Main Topic

Physik

Other Topics

Physik

Host

Seminar Quantm Dynamics

Description

I talk about coherent phonon oscillations and tunneling between two coupled nonlinear nanomechanical resonators. I show that the coupling between two nanomechanical resonators create an effective phonon Josephson junction which exhibits two different dynamical behaviors: Josephson oscillation (phonon-Rabi oscillation) and macroscopic self-trapping (phonon blockade). Self-trapping originates from mechanical nonlinearities, meaning that when the nonlinearity exceeds its critical value, the energy exchange between the two resonators is suppressed, and phonon-Josephson oscillations between them are completely blocked. Finally, I explain the phonon-phonon coherence quantified by the mean fringe visibility, and show that the interaction between the two resonators may lead to the loss of coherence in the phononic junction.

Last modified: Aug 24, 2016, 9:57:02 AM