title: 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 g0/2 π is nearly as large as the mechanical frequency, a criterion that defines the ultrastrong coupling regime.
authors.affiliation: 1] Nanophysics et Semiconductors Joint Team, Institut Néel, CNRS - Université Joseph Fourier, 38042 Grenoble, France [2] Nanophysics et Semiconductors Joint Team, CEA/INAC/SP2M and Université Joseph Fourier, 38054 Grenoble, France.
authors.forename: I
authors.initials: I
authors.lastname: Yeo
authors.affiliation: Nanophysics et Semiconductors Joint Team, Institut Néel, CNRS - Université Joseph Fourier, 38042 Grenoble, France.
authors.forename: P-L
authors.initials: PL
authors.lastname: de Assis
authors.affiliation: Institut Néel, CNRS and Université Joseph Fourier, 38042 Grenoble, France.
authors.forename: A
authors.initials: A
authors.lastname: Gloppe
authors.affiliation: Institut Néel, CNRS and Université Joseph Fourier, 38042 Grenoble, France.
authors.forename: E
authors.initials: E
authors.lastname: Dupont-Ferrier
authors.affiliation: Institut Néel, CNRS and Université Joseph Fourier, 38042 Grenoble, France.
authors.forename: P
authors.initials: P
authors.lastname: Verlot
authors.affiliation: Nanophysics et Semiconductors Joint Team, CEA/INAC/SP2M and Université Joseph Fourier, 38054 Grenoble, France.
authors.forename: N S
authors.initials: NS
authors.lastname: Malik
authors.affiliation: Nanophysics et Semiconductors Joint Team, CEA/INAC/SP2M and Université Joseph Fourier, 38054 Grenoble, France.
authors.forename: E
authors.initials: E
authors.lastname: Dupuy
authors.affiliation: Nanophysics et Semiconductors Joint Team, CEA/INAC/SP2M and Université Joseph Fourier, 38054 Grenoble, France.
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authors.initials: J
authors.lastname: Claudon
authors.affiliation: Nanophysics et Semiconductors Joint Team, CEA/INAC/SP2M and Université Joseph Fourier, 38054 Grenoble, France.
authors.forename: J-M
authors.initials: JM
authors.lastname: Gérard
authors.affiliation: Nanophysics et Semiconductors Joint Team, Institut Néel, CNRS - Université Joseph Fourier, 38042 Grenoble, France.
authors.forename: A
authors.initials: A
authors.lastname: Auffèves
authors.affiliation: Nanophysics et Semiconductors Joint Team, Institut Néel, CNRS - Université Joseph Fourier, 38042 Grenoble, France.
authors.forename: G
authors.initials: G
authors.lastname: Nogues
authors.affiliation: Institut Néel, CNRS and Université Joseph Fourier, 38042 Grenoble, France.
authors.forename: S
authors.initials: S
authors.lastname: Seidelin
authors.affiliation: Nanophysics et Semiconductors Joint Team, Institut Néel, CNRS - Université Joseph Fourier, 38042 Grenoble, France.
authors.forename: J-Ph
authors.initials: JP
authors.lastname: Poizat
authors.affiliation: Institut Néel, CNRS and Université Joseph Fourier, 38042 Grenoble, France.
authors.forename: O
authors.initials: O
authors.lastname: Arcizet
authors.affiliation: Nanophysics et Semiconductors Joint Team, Institut Néel, CNRS - Université Joseph Fourier, 38042 Grenoble, France.
authors.forename: M
authors.initials: M
authors.lastname: Richard