Quantum Coherence Lab

Zumbühl Group

 

News from our Group

Prof. Catalina Marinescu gave talk on spin-orbit quantum corrections

Prof. Catalina Marinescu, Clemson University, USA, gave a special seminar about "Localization in Spin-Orbit Coupled Electron Systems". Thanks for giving a very nice paedagogical presentation, from the basics of weak-localization physics to the new, break-through result: analytical closed-form solution for general Rashba-Dresselhaus coupled semiconductor quantum wells, as presented in our PRL112, 156601 (Apr 2019)

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QUSTEC call for PhD students

Call open for 39 doctoral fellowships on Quantum Science and Technologies on EUCOR -- The European Campus through MSCA COFUND H2020 Trinational Doctoral Program.

Apply now, call closes Aug 19, 2019.

More information https://www.eucor-uni.org/en/qustec/application-information/apply/

Flyer

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Published in Carbon: "Characterization of hydrogen plasma defined graphene edges"

Our international team characterizes the quality of remote hydrogen plasma defined graphene edges by Raman spectroscopy, atomic resolution AFM and low temperature electronic transport measurements. For graphene on hBN, the edge is ~40% zigzag and ~60% armchair-30 degree segments, while overall running in the zigzag direction. Rehmann, Kalyoncu et al., Carbon 150, 417 (May 24, 2019).

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Published in Phys. Rev. Letters: "Spectroscopy of Quantum-Dot Orbitals with In-Plane B-Fields"

Riken-UCSB-Basel collaboration extracts full 3D-confinement parameters and in-plane orientation of the single-electron quantum orbitals of a GaAs gate-defined dot with sub-nm precision. This is a versatile tool for quantum dots with one dominant axis of strong con finement. Camenzind, Yu et al., Phys. Rev. Lett. 122, 207701 (May 22, 2019). Editors' Suggestion and featured with viewpoint in Physics. See also UniNews.

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"Closed-Form Weak Localization..." published in Phys. Rev. Letters!

This is theoretical work lead by Catalina Marinescu, Clemson University, and J. Carlos Egues, Sao Paulo University, with experiments by Pirmin Weigele and Dominik Zumbühl, University of Basel. We have derived a closed-form expression for the weak localization corrections to the magnetoconductivity of a 2D electron system such as a GaAs quantum well with arbitrary Rashba and both linear and cubic Dresselhaus spin-orbit interactions in a perpendicular magnetic field geometry. Marinescu et al., Phys. Rev. Lett. 122, 156601 (Apr 18, 2019).

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