Ultrahigh-frequency complex-oxide acousto-electronics (WP1-3)

Host: University of Twente (TWENTE)
Supervisor: W.G. van der Wiel, Co-supervisor: Arjen Janssens, M.Sc.  (SolMateS) 

Enschede

Yigitcan Uzun

Objectives

Generation of ultrahigh-frequency (UHF) SAWs on complex-oxide multilayers, in particular on top of the SrTiO3/LaAlO3 conducting interface. Complex oxides display a very strong interplay between the electronic, orbital and structural degrees of freedom, leading to rich magnetic effect and superconductivity, which are not found in their semiconducting counterparts (e.g. like GaAs/AlGaAs).

The conducting interface is close to the surface, which can be epitaxially coated by strong piezoelectrics (e.g. LiNbO3), thus making this materials system very suitable for carrier manipulation by SAWs. Hardly any work has been done in this field. Acoustic transport will be investigated in structures similar to those on GaAs and Si. Our aim is to integrate the SAW technology with the oxide electronics and to demonstrate carrier and spin transport. We will hereby hugely benefit from the world-class oxide growth facilities and expertise in TWENTE.  

Expected Results

ESR6-TWENTE2 will fabricate UHF SAW devices on SrTiO3/LaAlO3 conducting interfaces, using NIL. Design of the devices will be in collaboration with PDI. Suitable piezoelectric layers will be grown epitaxially on top using PLD in collaboration with SolMateS. Acousto-electronic transport will be studied in complex-oxide heterostructures, also in combination with nanoelectronic devices defined in the conducting interface. We expect to realise a SAW sensor based on a complex-oxide system with a monolayer with organic receptor molecules on top.

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