Heavy hole states in Germanium hut wires

Hannes Watzinger, Christoph Kloeffel, Lada Vukušić, Marta D. Rossell, Violetta Sessi, Josip Kukučka, Raimund Kirchschlager, Elisabeth Lausecker, Alisha Truhlar, Martin Glaser, Armando Rastelli, Andreas Fuhrer, Daniel Loss, Georgios Katsaros

https://arxiv.org/abs/1607.02977

http://pubs.acs.org/doi/abs/10.1021/acs.nanolett.6b02715

Thomas Adletzberger from the Miba Machine Shop wired our probe in record time! He did an amazing job – we were able to load our first sample just one week after the fridge installation!

 This week Ferdinand Kuemmeth from the Center for Quantum Devices at Niels Bohr Institute, University of Copenhagen visited IST Austria and our lab. Except enjoying a very interesting talk about spin and majorana qubits, in relaxed discussions we learned a lot from Ferdinand about experiments we are about to perform.

We are looking forward to participate at The Silicon Quantum Electronics Workshop in Delft, The Netherlands.  H. Watzinger will give a talk on Heavy hole charge sensing and double quantum dots in Ge hut wires and big part of the group will be there to cheer for him (and hear what is the best way to build a quantum computer, of course).

The last week of April our dilution fridge CF-CS81-1400-MAG from Leiden Cryogenics arrived. We had some fun unloading it from the truck and transporting it into the lab building – many thanks to Thomas and his tractor for the help, Todor and the whole Miba mechanical shop and the Construction and Maintenance crew for fighting against a stubborn door. Luckily elevators are spacious enough for such a monster and soon after delivery the fridge was (still unpacked) waiting for the installation day.

This dry dilution refrigerator has a cooling power of 1.4 mW at 120mK, a probe diameter of 81mm, 48 DC lines, 8 RF lines and it is equipped with a vector magnet: 9Tesla in the z – direction and 3Tesla in the x – direction are possible.

On Monday the installation process started and it is still ongoing. Arlette de Waard from Leiden Cryogenics takes care that at everything goes smoothly.

On December 1st 2015 Lab Building West opened its doors. Since then there has been some progress in our lab (electricity, plugs, water lines, exhaust…), furniture arrived and now we need just a bit of fine-tuning and we are ready to go!

Stay tuned!