Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 15: Quantum Dots and Wires: Fabrication and Devices

HL 15.7: Hauptvortrag

Montag, 7. März 2016, 16:15–16:45, H16

Mechanical Control of Excitonic States in Quantum Dots — Rinaldo Trotta, Javier Martín-Sánchez, and •Armando Rastelli — Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, Austria

Several systems are under investigation for their potential use in the fields of quantum information and communication. Semiconductor quantum dots (QDs), also dubbed ``artificial atoms'', are one of such systems, as they can be used both as sources and hosts of ``quantum bits'' and can be easily integrated into compact devices and photonic structures. However, unlike natural atoms, no two QDs are identical - a major obstacle towards their actual application.

In this talk we will show how elastic strain can be used to overcome problems arising from unavoidable fluctuations during QD growth and to reshape the QD electronic structure and excitonic emission after fabrication. In particular, we will illustrate how any arbitrarily chosen QD can be employed as a wavelength-tunable source of entangled-photon pairs. This is achieved by integrating the QDs onto micro-machined piezoelectric actuators capable of controlling the in-plane strain in the QD and surrounding matrix [1-3].

[1] R. Trotta et al., Phys. Rev. Lett. 114, 150502 (2015)

[2] R. Trotta et al., Nature Comm. (in press)

[3] J. Martín-Sánchez et al., Adv. Opt. Mater. (in press)