News

Miguels talk

March Meeting 2021 taking place online...

Conferences such as the March Meeting of the American Physical Society are a great opportunity to present results, meet other scientists, get exposed to questions, and engage in dialogue... particularly when the next speaker did not appear…
finFET

On arXiv: A spin qubit in a fin field-effect transistor

Scaling up is quantum computing's greatest challenge. Silicon fin field-effect transistors (finFETs) are the pinnacle of decades of large scale integration and scaling to billions of transistors each of few-nm size. Here, we demonstrate…
APS MM 2021

APS March Meeting 2021 Online: Zumbühl Group Talks

A30.03 Mobility limiting factors in Si-MOSFETs in full CMOS process Tim Camenzind (Mon 2:00 pm - 5:00 pm) session link J29.10 Isotropic and Anisotropic g-factor Corrections in GaAs Quantum Dots Simon Svab (Tue 9:00 pm - 12 am), session link…
finFET

Published as Editor's pick in APL: Silicon quantum dots with a self-aligned gates

We present silicon finFET quantum dots with perfectly self-aligned 2nd gate layer and gate lengths down to 15 nm. The fabrication is industry compatible and scalable and gives very high quality devices. We observe Pauli spin blockade and…
dmz

Dominik Zumbühl new director of NCCR SPIN

After unanimous election by the Executive Committee of NCCR SPIN, Dominik Zumbühl was proposed to the SNF and confirmed this week as the new director of NCCR SPIN. Richard Warburton decided to resign as director of NCCR SPIN in November…
GeSi Holes g-factor renormalization

Strong spin-orbit interaction and g-factor renormalization published in Phys. Rev. Res.

Enhancement of g-factors in a B-field due to strong spin-orbit coupling in Ge/Si core/shell nanowire hole spins! Collaboration with TU Eindhoven, University of Twente and Basel Theory as well as Experiment. Froning, Rancic et al., Phys.…
HeHPurge

Published in Cryogenics: Reducing the hydrogen content in liquid helium

Contamination of liquid helium with hydrogen, even at the low levels of 10s of ppm, can lead to blockage of helium intake capillaries needed to operate 1K pots for experiments below 4K, e.g. 3He and dilution refrigerators, thus bringing…
Qubit Device

/ Research

New Type of Qubit with Tunable Speed and Frequency

Physicists from the University of Basel and the TU Eindhoven have demonstrated a new type of qubit – the basic building block of a quantum computer – where the speed and frequency of operation can be widely tuned with a gate voltage. They…
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PhD position in Spin Qubits in Ge quantum well nanostructures

We are looking for a highly motivated, talented and technology-savvy physics or nanoscience student to join our spin qubit team and work on gate defined spin qubits in Ge quantum wells, starting in Q2 or Q3 of 2021. MSc theses on this are…
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Call for Georg H. Endress Postdoc Fellows

We are looking for outstanding and highly motivated scientists who recently finished a PhD in quantum science and quantum computing. Fellows will be appointed for up to three years, and will be selected on the basis of scientific excellence…
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SNF Early Postdoc.Mobility Fellowship for Leon Camenzind

Leon Camenzind was awarded an SNSF Early Postdoc.Mobility fellowship to join the group of Prof. Seigo Tarucha at the Quantum Functional System Research Group, RIKEN Center for Emergent Matter Science, Tokyo, Japan, as a postdoctoral…
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Interview "Revolution in Quantum Physics" in Fon-Times

Fon-Times Interview mit Dominik Zumbühl. Seit rund zwanzig Jahren läuft die zweite Revolution der Quantenphysik. Neue Experimente führen vor Augen, dass sie die verrückte Welt der Quantenphysik genutzt werden kann, um nützliche Dinge…
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Published in PRB (Editor's Suggestion): Out-of-plane corrugations in graphene heterostructures

Even when sandwiched between atomically flat hBN crystals, surprisingly, graphene still exhibits ripples, even in absence of bubbles. These out-of-plane corrugations reduce mobility and suppress weak localization in an in-plane magnetic…
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On arXiv: Reducing the hydrogen content in liquid helium

Molecular hydrogen can block liquid He (LHe) intake capillaries typically used on 1K pots of many cryostats, causing severe disruption to the experiments. Here, we measure molecular hydrogen content in the liquifier helium gas supply and…
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On arXiv: Isotropic and Anisotropic g-factor Corrections in GaAs Quantum Dots

The spin splitting defines the qubit energy and is one of the fundamental properties of a semiconductor electron in a magnetic field. Here, we measure and separate the isotropic and anisotropic corrections to the bulk g-factor in two GaAs…