PhD student for bulk synthesis and characterizations of topological materials
The successful candidate will grow single crystals of topological materials (topological insulators, Weyl semimetals, etc.) and measure their magnetotransport properties to discover novel topological phenomena.
Postdocs and a PhD candidate
Investigation of spin-orbit coupling and many-body effects in novel 2D materials
We are looking for a postdocs and a PhD candidate to work on the spectroscopy of 2D materials. We use a unique combination of a homebuilt ultra-high vacuum Raman spectrometer and synchrotron radiation based techniques such as angle-resolved photoemission spectroscopy to study the electronic and vibrational properties of chemically functionalized, novel low-dimensional materials such as 1D graphene nanoribbons and members of the 2D materials library such as phosphorene and transition metal dichalcogenides.
1) Inelastic photon scattering in spin-orbit dominated quantum matter
Inelastic light scattering (Raman, Resonant Inelastic X-ray Scattering) are excellent methods to reveal and study novel excitations in quantum materials. Within this PhD project, we aim to employ these techniques to explore emergent exotic phenomena in spin-orbit-dominated correlated transition-metal oxides such as the occurence of Majorana excitations in Kitaev spin-liquid materials.
2) Optically driven matter
Recent developments in ultrafast laser technology has opened the way to coherently drive materials into novel states of matter. Within this project we will explore the the dynamical non-equilibrium properties of spin-orbit coupled quantum matter, which includes optically inducing and manipulating skyrmions in chiral magnets as well as inducing novel collective spin-charge coupled excitations in topological insulators. Ideally candidates for this position have experience in ultrafast pump-probe and/or time domain THz experiments.
Spin-polarized tunneling spectroscopy
Low temperature spin-polarized scanning tunneling microscopy and spectroscopy in magnetic fields is the tool to uncover spin structures at surfaces on the atomic scale. At the heart of the project is the spin structure analysis of in situ synthesized organometallic nanowires, of 2D-material/ferromagnet hybrid structures, and of skyrmion systems based on rare earth layers. The applicant will have access to a variable temperature as well as a 4 K system, and be responsible for a 300 mK STM/STS instrument with vector magnet. Scientific qualification of the Postdoc will be supported. The position will be available starting with January 2018 and applications should be submitted no later than 15th September 2017.
Spectroscopy in the THz range has experienced an enormous development in recent years. For investigations of condensed matter, the combination of THz frequencies, low temperatures, and high magnetic fields is particularly interesting. We employ a unique continuous-wave THz spectrometer based on photomixing with phase-sensitive homodyne detection which offers a series of attractive features: magnetic fields up to 10 T, temperature range of 2 – 300 K, broad frequency range (about 60 GHz to 2 THz) with a high resolution (a few MHz), and detection of both amplitude and phase.
The successful candidate will employ THz spectroscopy – in combination with optical spectroscopy at higher frequencies - to study the properties of materials which are governed by strong spin-orbit coupling, electronic correlations, and/or topology. Examples are topological insulators, iridates, and multiferroics.