Departement News

ALL YOU CAN LEARN investigating phonons in a nanoscale heterostruture

Raman spectroscopy can allow the determination of lattice dynamics, chemical composition, strain level, and some electronic properties of semiconductors, including nanowires. In this work, we make a step forward in the use of Raman spectroscopy in nanowires by investigating for the first time the most challenging type of heterostructure in nanowires (a nanoscale heterostructure with constant material composition). The heterostructure is made by small (∼20 nm) domains with hexagonal crystal phase formed in cubic nanowires. We assess the phonon properties of hexagonal Ge and, remarkably, reconstruct the relative orientation of the cubic and hexagonal domains. Furthermore, information about the band structure alignment are inferred using phonons as a probe. The general procedure that we establish can be applied to several types of heterostructures. Published in Nano Letters and selected for a cover of the issue.

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Master in Physics: A Video-Testimonial by Märta Tschudin

Master Student Märta Tschudin on her graduate student experience at the University of Basel.

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Not so fast on modified gravity

An international group of astronomers including Oliver Müller from the University of Basel has debunked another premature claim that a leading modified gravity theory is dead – publishing their results in the prestigious journal Nature.

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Probing individual edge states with unprecedented precision

A new technique makes it possible to obtain an individual fingerprint of the current-carrying edge states occurring in novel materials such as topological insulators or 2D materials. Physicists of the University of Basel present the new method together with American scientists in “Nature Communications.”

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New mechanism of electron spin relaxation observed

Physicists at the University of Basel are working on using the spin of an electron confined in a semiconductor nanostructure as a unit of information for future quantum computers. For the first time, they have now been able to experimentally demonstrate a mechanism of electron spin relaxation that was predicted 15 years ago. The scientists also succeeded in keeping the direction of the electron spin fixed for almost a minute – a new record. The results of the collaboration with researchers from Japan, Slovakia and the US have been published in Nature Communications.

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Marta De Luca is awarded a SNF Ambizione grant

Ambizione grants are aimed at young researchers who wish to conduct, manage and lead an independent project at a Swiss higher education institution. The scheme supports young researchers both from Switzerland and abroad. Scientists holding non-professorial academic positions at higher education institutions are also eligible to submit an application. [Source: SNF]

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Novel approach to coherent control of a three-level quantum system

For the first time, researchers were able to study quantum interference in a three-level quantum system and thereby control the behavior of individual electron spins. To this end, they used a novel nanostructure, in which a quantum system is integrated into a nanoscale mechanical oscillator in form of a diamond cantilever. Nature Physics has published the study that was conducted at the University of Basel and the Swiss Nanoscience Institute.

 

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The smallest possible system that can be synchronized is discovered

Synchronization is ubiquitous in our everyday life. We experience it for instance when getting jetlagged after a long trip; there, the underlying mechanism is the synchronization of our circadian rhythm to the day-night cycle. Physicists in Basel have addressed a major difficulty that arises when trying to understand this phenomenon in a quantum setting. They have identified the minimal quantum resource that can be synchronized to an external periodic signal. Their system can be readily implemented in the laboratory and provides the ideal platform for studying complex large networks of quantum units. The results have been published in Physical Review Letters and featured as a viewpoint in Physics. We discuss the relation between quantum synchronization and entanglement in another Physical Review Letters.

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Hello Quantum! James Wootton develops a mobile game with IBM

Quantencomputer besitzen eine Aura des Mystischen, nicht Verstehbaren. Das Spiel «Hello Quantum» soll das ändern. Der Quantenphysiker James Wootton von der Universität Basel hat diese App gemeinsam mit IBM entwickelt.

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Startup Qnami wins Venture Kick finals

The young startup of the University of Basel, Qnami, is the winner of the Venture Kick prize worth 130’000 Swiss Francs. Qnami develops precise and highly sensitive quantum sensors that provide images in nanometer resolution.

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