A strain-tunable quantum dot embedded in a nanowire antenna

Kremer, P.E., Dada, A.C. , Kumar, P., Ma, Y., Kumar, S., Clarke, E. and Gerardot, B.D. (2014) A strain-tunable quantum dot embedded in a nanowire antenna. Physical Review B, 90(20), 201408(R). (doi: 10.1103/PhysRevB.90.201408)

Abstract

We demonstrate an elastically-tunable self-assembled quantum dot in a nanowire antenna that emits single photons with resolution-limited spectral linewidths. The single-photon device is comprised of a single quantum dot embedded in a top-down fabricated nanowire waveguide integrated onto a piezoelectric actuator. Non-resonant excitation leads to static (fluctuating) charges likely at the nanowire surface, causing DC Stark shifts (inhomogeneous broadening); for low excitation powers, the effects are not observed and resolution-limited linewidths are obtained. Despite significant strain-field relaxation in the high-aspect-ratio nanowires, we achieve up to 1.2 meV tuning of a dot's transition energy. Single-photon sources with high brightness, resolution-limited linewidths, and wavelength tunability are promising for future quantum technologies.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Dada, Dr Adetunmise
• Authors: Kremer, P.E., Dada, A.C., Kumar, P., Ma, Y., Kumar, S., Clarke, E., and Gerardot, B.D.
• College/School: College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• Journal Name: Physical Review B
• Publisher: American Physical Society
• ISSN: 1098-0121
• ISSN (Online): 1550-235X
• Published Online: 24 November 2014