Strain-mediated coupling in a quantum dot-mechanical oscillator hybrid system
Abstract
Recent progress in nanotechnology has allowed the fabrication of new hybrid systems in which a single two-level system is coupled to a mechanical nanoresonator. In such systems the quantum nature of a macroscopic degree of freedom can be revealed and manipulated. This opens up appealing perspectives for quantum information technologies, and for the exploration of the quantum-classical boundary. Here we present the experimental realization of a monolithic solid-state hybrid system governed by material strain: a quantum dot is embedded within a nanowire that features discrete mechanical resonances corresponding to flexural vibration modes. Mechanical vibrations result in a time-varying strain field that modulates the quantum dot transition energy. This approach simultaneously offers a large light-extraction efficiency and a large exciton-phonon coupling strength g0. By means of optical and mechanical spectroscopy, we find that g0/2π is nearly as large as the mechanical frequency, a criterion that defines the ultrastrong coupling regime.
- Publication:
-
Nature Nanotechnology
- Pub Date:
- February 2014
- DOI:
- 10.1038/nnano.2013.274
- arXiv:
- arXiv:1306.4209
- Bibcode:
- 2014NatNa...9..106Y
- Keywords:
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- Condensed Matter - Mesoscale and Nanoscale Physics
- E-Print:
- 6 pages, 3 figures