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News 10.07.2018

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Following our tradition, members of our Institute participated at the "Lousberglauf 2018”. Withstanding the gruesome heat, Michael (21:15), Markus (23:15), Benedikt (25:53), Alex (26:06) and Christoph (29:51) finished the challenging course together with over 1800 other participants. Congratulations!

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International Master's program in physics: Promotional video

The international Master's program in Physics is a two years program. The first year consists of lectures, seminars and lab courses. The second year is dedicated to an individual research project.

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New publication: Advanced tools for smartphone-based experiments: phyphox


Physics Education 53, 045009 (2018)
The sensors in modern smartphones are a promising and cost-effective tool for experimentation in physics education, but many experiments face practical problems. Often the phone is inaccessible during the experiment and the data usually needs to be analyzed subsequently on a computer. We address both problems by introducing a new app, called "phyphox", which is specifically designed for utilizing experiments in physics teaching. The app is free and designed to offer the same set of features on Android and iOS.

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New publication: Impact of Many-Body Effects on Landau Levels in Graphene


Phys. Rev. Lett. 120, 187701(2018)
We present magneto-Raman spectroscopy measurements on suspended graphene to investigate the charge carrier density-dependent electron-electron interaction in the presence of Landau levels. Utilizing gate-tunable magnetophonon resonances, we extract the charge carrier density dependence of the Landau level transition energies and the associated effective Fermi velocity vF. In contrast to the logarithmic divergence of vF at zero magnetic field, we find a piecewise linear scaling of F as a function of the charge carrier density, due to a magnetic-field-induced suppression of the long-range Coulomb interaction. We quantitatively confirm our experimental findings by performing tight-binding calculations on the level of the Hartree-Fock approximation, which also allow us to estimate an excitonic binding energy of ≈6  meV contained in the experimentally extracted Landau level transitions energies.

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New publication: Time-resolved lateral spin-caloric transport of optically generated spin packets in n-GaAs


Journal of Physics D: Applied Physics 51, 214003(2018)
We report on lateral spin-caloric transport (LSCT) of electron spin packets which are optically generated by ps laser pulses in the non-magnetic semiconductor n-GaAs at T < 35 K. LSCT is driven by a local temperature gradient induced by an additional cw heating laser. The spatio-temporal evolution of the spin packets is probed using time-resolved Faraday rotation. We demonstrate that the local temperature-gradient induced spin diffusion is solely driven by a non-equilibrium hot spin distribution, i.e. without involvement of phonon drag effects.

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New publication: Quantum transport through MoS2 constrictions defined by photodoping


Journal of Physics: Condensed Matter 30, 205001(2018)
We present a device scheme to explore mesoscopic transport through molybdenum disulfide (MoS2) constrictions using photodoping. The devices are based on van-der-Waals heterostructures where few-layer MoS2 flakes are partially encapsulated by hexagonal boron nitride (hBN) and covered by a few-layer graphene flake to fabricate electrical contacts. Since the as-fabricated devices are insulating at low temperatures, we use photo-induced remote doping in the hBN substrate to create free charge carriers in the MoS2 layer. On top of the device, we place additional metal structures, which define the shape of the constriction and act as shadow masks during photodoping of the underlying MoS2/hBN heterostructure. Low temperature two- and four-terminal transport measurements show evidence of quantum confinement effects.

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Race report Bonn Marathon 2018

Our institute participated successfully in the "Deutsche Post Marathon 2018" in Bonn. Together with 13,000 other participants, over 200,000 spectators and best weather, Markus (1:35:29), Alex (1:52:06) and Luca (1:54:21) completed the Half Marathon course while Michael ran the full Marathon in 3:23:16. Congratulations!

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Söllerhaus-Workshop 2018

The Söllerhaus-Workshop 2018 from the 28th to the 31st of March of the 2nd Institute of Physics A and B focusing on "2D materials" was great fun with many interesting talks and discussions and lots of good snow. For more information on the program see here.

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