Coherent coupling of dark and bright excitons with vibrational strain

Abstract

In many physical systems, there are specific electronic states called dark state that are protected from the rapid radiative decay imposed by the system symmetry. Although their long-lived nature indicates their potential for quantum information and spintronic applications, their high stability comes at the expense of optical accessibility. Breaking the symmetry by using magnetic and electric fields has been employed to hybridize dark and bright states thus making them optically active, but high-frequency and on-chip operation remains to be developed. Here we demonstrate the strain-induced coherent coupling of dark and bright exciton states in a GaAs mechanical resonator. The in-plane uniaxial strain breaks the rotational symmetry of the crystal, allowing the dark states to be optically accessible without any external fields. Such dark-bright coupling is tailored by the local strain distribution, which enables the coherent spin operation in the gigahertz regime and opens the way to on-chip excitonic quantum memories and circuits.

16 pages, 7 figures

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Cited by in corpus (10)

• Optomechanics of chiral dielectric metasurfaces
• Rare-earth-mediated opto-mechanical system in the reversed dissipation regime
• Optomechanical Modulation Spectroscopy of Bound-States-In-The-Continuum in a dielectric metasurface
• Peculiar spectra of dark and bright excitons in alloyed nanowire quantum dots
• Dark-bright excitons mixing in alloyed InGaAs self-assembled quantum dots
• Mechanically modulated emission spectra and blockade of polaritons
• Deterministic photon storage and readout in a semimagnetic quantum-dot--cavity system doped with a single Mn ion
• Strain-induced exciton decomposition and anisotropic lifetime modulation in a GaAs micromechanical resonator
• All-optical dynamic modulation of spontaneous emission rate in hybrid optomechanical cavity quantum electrodynamics systems
• Thickness dependent dark exciton emission in (PEA)2PbI4 nanoflake and its brightening by in-plane magnetic field