Research group of Prof. Dr. Stefan Mathias
We offer a wide range of bachelor and master projects, of which a few examples are listed below. If you are interested, feel free to write Prof. Stefan Mathias (smathias@uni-goettingen.de) or send an email to the responsible researcher for the project.
Dynamics in correlated materials
- Optically induced phase transitions in 2D materials
- Light-induced control of the electronic band structure
A possible project could be Moiré physics: Exploring correlated exciton phases in 2D heterostructures with time-resolved momentum microscopy. For more information, see the paper Time-resolved momentum microscopy with a 1 MHz high-harmonic extreme ultraviolet beamline and ask Jan Philipp Bange (janphilipp.bange@stud.uni-goettingen.de) for details.
Another possible project could be Light induced phase transition: Manipulate various quantum states and investigate the transition mechanisms using time-resolved momentum microscopy. For more information, see the paper Nonvolatile optical control of interlayer stacking order in 1T-TaS2 and ask Junde Liu (liu.junde@uni-goettingen.de) for details.
Dynamics at interfaces and surfaces
- Time- and angle-resolved two-photon photoemission from 2D materials
- Interferometrically time-resolved multiphoton photoemission
- Charge transfer in organic and 2D material heterostructures
A possible project could be Time-resolved photoemission orbital tomography on hybrid organic/2D material interfaces. For more information, see the papers Efficient orbital imaging based on ultrafast momentum microscopy and sparsity-driven phase retrieval and Tracing orbital images on ultrafast time scales. Ask Wiebke Bennecke (wiebke.bennecke@stud.uni-goettingen.de) for more details.
Ultrafast spin dynamics
- Element-resolved investigations of multisublattice ferromagnets using extreme ultraviolet (EUV) light
- Photoinduced ferromagnetism in correlated materials
- Topological spin structures in metallic multilayers
- Ferromagnetism in reduced dimensions
- Dynamics of spin-resolved band structures
A possible project in the field of EUV spectroscopy could be Exploring magnetic, electronic and structural dynamics in the low-dimensional magnet CrxTe2. For more information, see Unraveling femtosecond spin and charge dynamics with extreme ultraviolet transverse MOKE spectroscopy, and ask Matthijs Jansen (gsmjansen@uni-goettingen.de) for more details.
We currently offer several projects in the field of time-resolved optical spectroscopy:
- Investigation of the temperature-dependent magnetization dynamics in layered 2D ferromagnets
- Investigation of different stabilization mechanisms on the dynamics of spin textures in magnetic multilayers
- Exploring temperature-dependent electron, lattice and spin dynamics in correlated oxide materials
- Build-Up of a new white light spectroscopy setup
For details contact Tim Titze (tim.titze@uni-goettingen.de). Further projects can be offered here with a focus on certain materials, in the further development of the measurement setup or in data acquisition and analysis (focus: programming).
In the field of spin-resolved band structure dynamics, we aim to investigate the:
- transient evolution of the spin order in quantum materials under laser excitation
- physical mechanisms driving ultrafast magnectic transition in ferromagnetic, antiferromagnetic and altermagnetic materials
- ultrafast spin dynamics in the surface resonant state and topological surface state
A possible project could be: Explore dynamics in spin textured materials with spin- and time-resolved momentum microscopy. For more information, see the paper Spin resolved bandstructure imaging with a high resolution momentum microscope and ask Junde Liu (liu.junde@uni-goettingen.de) for details.
EUV spectroscopic Imaging
- Element-specific interferometric spectroscopy with spatial resolution using High Harmonics
- Nanoscale spectroscopy of 2D quantum materials
In this area of research, we offer projects with experimental and/or numerical focus. These are:
- Wavefront analysis using interferometric measurements,
- Spectroscopy measurements in reflection
- The development of efficient reconstruction algorithms for time resolved data.
For more information, see the paper Spatially resolved Fourier transform spectroscopy in the extreme ultraviolet or Fast spectroscopic imaging using extreme ultraviolet interferometry. Please contact Hannah Strauch (h.strauch@stud.uni-goettingen.de) for further questions.