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Advanced Gallium Nitride based Quantum Devices (Q-GaN)
- Schematic illustration of the cavity-enhanced TPE concept using a QD-nanocavity system. One incom-ing photon (blue) triggers the emission of two photons (green and red) at lower energy.
- © TU Berlin
Within this project we will develop and study
advanced GaN-based quantum devices. We will demonstrate novel concepts
to manipulate the emission process of GaN quantum dots and to exploit
non-linear emission processes for the generation of quantum light.
This includes single photons with externally adjustable emission
energy and entangled photon pairs. For this purpose we will develop
nanocavity systems in the GaN material system which allow us to
control and enhance the spontaneous emission of single quantum dots by
cavity quantum-electrodynamics effects. As a central goal of the
project we will exploit the Purcell effect in photonic crystal
cavities to enhance the probability of two-photon emission processes
which is negligible for bare quantum dots but can be boosted in the
presence of an optical resonance of a nanocavity structure. Cavity
enhanced two-photon processes will also be exploited for frequency up-
and down-conversion of light at the single photon level. Moreover, we
will for the first time embed single quantum dots into
piezo-controlled GaN nanocavities to tune their excitonic emission
energies via external strain fields.
Our approach will allow us to realize compact quantum systems for the triggered emission of single photons and entangled photon pairs with adjustable energy via two photon emission processes. Here, the GaN material system is of particular interest because of large exciton binding energies and large band offsets which enable operation at elevated temperatures up to 300 K. Most importantly, GaN QDs exhibit intrinsically a parity breaking which greatly enhances two-photon processes. The results of our project will have impact on the emerging quantum information technology which relies crucially on the availability of advanced quantum light sources.
Prof. N. Grandjean, Ecole polytechnique fédérale de Lausanne (EPFL)
Prof. A. Hoffmann, Institute of Solid State Physics, TU Berlin
Dr. A. Schliwa, Institute of Solid State Physics, TU Berlin
German Research Foundation, Grant-No.: Re2974/8-1
G. Callsen, A. Carmele, G. Hönig, C. Kindel, J. Brunnmeier, M. R. Wagner, E. Stock, J. S. Reparaz, A. Schliwa, S. Reitzenstein, A. Knorr, A. Hoffmann, S. Kako, and Y. Arakawa, Phys. Rev. B 87, 245314 (2013)
N. Vico Triviño, U. Dharanipathy, J.-F. Carlin, Z. Diao, R. Houdre, and N. Grandjean, Appl. Phys. Lett. 102, 081120 (2013)
M. Schmidt et al., Deterministically fabricated spectrally-tunable quantum dot based single-photon source, Opt. Mater. Express 10, 76-87(2020) 
S. Jagsch et al., Ground-state resonant two-photon transitions in wurtzite GaN/AlN quantum dots,Phys. Rev. B 99, 245303 (2019) 
S. Fischbach et al., A deterministically fabricated spectrally-tunable quantum dot based single-photon source, ArXiv e-prints, 1805.10623 (2018) 
S.Jagsch et al., A quantum optical study of thresholdless lasing features in high-β nitride nanobeam cavities, Nature Comm. 9, 564 (2018)