Journal
NATURE NANOTECHNOLOGY
Volume 9, Issue 2, Pages 106-110Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/nnano.2013.274
Keywords
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Funding
- Agence Nationale de la Recherche [RPDC2010]
- European Research Council (ERC Starting Grant 'HQNOM' )
- Agence Nationale de la Recherche (WIFO)
- European Research Council (ERC starting grant 'Handy-Q')
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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(1-9). In such systems the quantum nature of a macroscopic degree of freedom can be revealed and manipulated(10). This opens up appealing perspectives for quantum information technologies(11), 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(12): 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(13,14) and a large exciton-phonon coupling strength g(0). By means of optical and mechanical spectroscopy, we find that g(0)/2 pi is nearly as large as the mechanical frequency, a criterion that defines the ultrastrong coupling regime(15).
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