Thesis defence E. Mülazimoglu: superconducting interfaces

13 October 2017 12:30 - Location: Aula, TU Delft - By: Webredactie

Nanoscale Electrostatic Control of Superconducting Oxide Interfaces. Promotor: L.M.K. Vandersypen (TNW).

This work creates a new paradigm on reconfigurable superconducting devices using a recently discovered two-dimensional superconductor.

Lanthanum Aluminate (LAO) and Strontium Titanate (STO) are two insulating complex oxides, however when LAO forms an atomically sharp interface with STO, a two-dimensional superconductor emerges at the boundary of these materials with unique properties. Most notably, the superconductivity can be controlled ‘ON’ and ‘OFF’ remotely with electrostatic gate voltages, unlike any other known superconductor to-date.

In this work, we patterned 100 nanometer narrow top gates on 5 nanometer thin LAO films, using state-of-the-art cleanroom facility of the Kavli Institute of Nanoscience, and achieved local control on the superconducting properties of this unique system using these gates. We created reconfigurable superconducting circuit elements such as Josephson junctions, and Superconducting Quantum Interference Devices (SQUIDs) from a single superconductor such that the entire devices are made with purely electrostatic interfaces. Our results will definitely play an  important role in answering some fundamental questions about superconductivity at the nanoscale and may become technologically relevant in future.

More information?
For access to theses by the PhD students you can have a look in TU Delft Repository, the digital storage of publications of TU Delft. Theses will be available within a few weeks after the actual thesis defence.