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Dresden 2026 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 20: Poster I

HL 20.47: Poster

Dienstag, 10. März 2026, 18:00–20:00, P1

Importance of Aluminium Quality for High-Quality Quantum Emitter — •Severin Krüger1,2, Elias Kersting1, Phil Badura1, and Arne Ludwig11Ruhr-Universität Bochum, Bochum, Germany — 2Sparrow Quantum Aps, Copenhagen, Denmark

InAs quantum dots are regarded as excellent candidates for single photon emitters due to their high photon rates, good single photon properties, and compatibility with scalable and integratable photonic platforms.

Despite remarkable progress for quantum dots emitting at 950 nm, achieving the same results for quantum dots emitting in the important optical fibre transparency window around 1.3 *m has remained a major challenge.

Here we present a routine we used to monitor and improve the quality of aluminium containing layers grown in our MBE. We find that high quality Al in MBE significantly improves the interface quality and smoothness of Al(Ga)As layers by reducting the surface roughness.

These improvements enabled the growth of pristine distributed Bragg reflectors beneath a defect free, charge tunable quantum dot device, emitting near transform-limited single photons in the O-band at 1.3 um.

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