Gigahertz single-photon sources using coupled quantum wells and dots in microcavities (WP1-2)

Host: Paul-Drude Institut für Festkörperelektronik (PDI)
Supervisor: P. V. Santos (PDI), Co-supervisor: A. Shields (TREL)

Berlin

Paul Helgers


During my studies in applied physics at Eindhoven University of Technology (NL), I got specially interested in semiconductors, optics and spintronics. Now I am looking forward to be part of the SAWtrain network as an ESR at PDI in Berlin. It is a pleasure for me to combine all these three topics in my ESR project at PDI Berlin. In my project I will study single photons sources using SAW modulated quantum structures. Such sources are important in the experimental investigation of quantum physical fundamentals and future realizations of quantum computer devices. Along with single photons, the transport of spins will be investigated. Ultimately this will be combined with the single photon sources to tune the properties of the emitted photons. The experiences I gained throughout my studies in delicate optical experimental methods, characterization methods and nanofabrication will be particularly useful in my project.


Objectives

We aim at the investigation of acoustically driven GHz single-photon sources (SPSs) based on acoustic transport in interconnected (Al,Ga)As quantum wells (QWs) and dots (QDs). These SPSs operate at GHz frequencies and are expected to have very high photon yield and anti-bunching ratios. The QWs and QDs will be embedded into optical microcavities (MCs) produced by molecular beam epitaxy (MBE) on e-beam patterned GaAs substrates.

Single-carrier control will be achieved by including gate electrodes along the transport channel (collaboration with UCAM and CNRS). Acoustic carrier and spin transport (with NTT-BRL) as well as single-photon detection and emission will be investigated. Electrically driven SPSs may be achieved by adding doped contacts (as in WP3-2) to inject carriers.

Expected Results

Highly efficient SPSs with repetition rates above 1 GHz. ESR2-PDI2 will be involved in MBE growth of coupled QWRs/QDs in MCs on pre-patterned GaAs substrates, being exposed to different structural (XRD, SEM, TEM) and morphological (AFM, optical microscopy) techniques.

The ESR will learn advanced fabrication techniques (optical and e-beam lithography, at UCAM) as well as tools to calculate and measure acoustic and optical properties. Finally, ESR2-PDI2 will carry out carrier and spin transport as well as photon correlation using spatially and time-resolved photo-luminescence (with PICOQUANT,NTT-BRL).

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