University of Basel

Department
of Physics

Quantum Coherence Lab - Zumbühl Group

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"Hyperfine-phonon spin relaxation" published in Nature Communications!

Understanding and control of the spin relaxation time T1 is a key challenge for spin qubits, setting the fundamental upper limit to the qubit coherence and readout fidelity. We establish the prediction of hyperfine-phonon spin relaxation…
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Pulished in Appl. Phys. Letters: Ge/Si quantum dots

Published online on Aug 15 in Applied Physics Letters, our paper on gate defined quantum dots in Ge/Si nanowires, with single, double and triple dots, Pauli spin blockade, and signatures of a single hole quantum dot. Appl. Phys. Lett. 113,…
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Spin-orbit and g-factor effects in gate define quantum dots

We analyze orbital effects of an in-plane magnetic field on the spin structure of states of a gated quantum dot. Starting with a k.p Hamiltonian, we perturbatively calculate these effects for the conduction band of GaAs. We quantify…
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Ambipolar quantum dots in undoped silicon fin field-effect transistors: new arXiv submission

We integrate ambipolar quantum dots in silicon fin fi eld-eff ect transistors using exclusively standard complementary metal-oxide-semiconductor fabrication techniques. We realize ambipolarity by using a metallic nickel silicide with Fermi…
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Open Positions

We are looking for motivated and talented physicists for diverse projects. Please head over to the positions page for further information on the various projects.
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Single, double, and triple quantum dots in Ge/Si nanowires: new arXiv submission

We report highly tunable control of holes in Ge/Si core/shell nanowires (NWs). We demonstratethe a bility to create single quantum dots (QDs) of various sizes, with low hole occupation numbers and clearly observable excited states. For the…
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Two new manuscripts on arXiv, on Quantum-Dot Orbital-Spectroscopy with In-Plane Magnetic Fields!

Semiconductor spin qubits are leading candidates for quantum computation. Despite impressive progress over two decades, a tool to characterize the orbitals hosting the spin is lacking. Here, we demonstrate a spectroscopy method for quasi-2D…
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Just accepted in Nano Letters: "Template-assisted scalable nanowire networks"

Topological qubits based on Majorana fermions have the potential to revolutionize the emerging field of quantum computing by making information processing significantly more robust to decoherence. In this Letter, we report gold-free…
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Master/Project thesis position available! Hands on a Spin Qubit Device: g-factor anisotropy in GaAs

We are looking for a motivated, talented and technology-savvy physics or nanoscience student for research of the theoretically predicted g-factor anisotropy in a lateral Gallium Arsenide (GaAs) quantum dot spin qubit device measured at…
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European Microkelvin Platform in Nature Materials Reviews

The growing demands of quantum materials, engineering and technology make access to microkelvin temperatures ever more essential. Experience in Europe suggests that new working methods, encouraged by an imaginative funding atmosphere, can…
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Template-assisted nanowire networks on arXiv!

Topological qubits based on Majorana fermions have the potential to revolutionize the emerging field of quantum computing by making information processing significantly more robust to decoherence. Nanowires (NWs) are a promising medium for…
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Edge state tunneling spectroscopy paper on arXiv!

One of the most intriguing and fundamental properties of topological materials is the correspondence between the conducting edge states and the gapped bulk spectrum. So far, it has been impossible to access the full evolution of edge states…
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Master Project available

We are looking for a highly motivated master student who is interested in working on low temperature quantum transport experiments. The goal of those experiments is to utilize a new spectroscopy technique developed in our group with the aim…
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Work on the European Microkelvin Platform (EMP) infrastructures proposal in Heidelberg

After hours of deliberations, changes and small-group work sessions, it's quite energizing to see the progress on the proposal achieved in the past three days in Heidelberg on the European Microkelvin Platform EMP!! After hours of…
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Symmetry Breaking of the Persistent Spin Helix in Quantum Transport appeared on arXiv!

In this work, we show that the physics of the quantum corrections to the conductivity around the persistent spin helix symmetry point can be treated very similar to the case with weak spin-orbit (SO) coupling, where the small parameter is…
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