There are no official vacancies at the moment, but we will be advertising again soon. Please contact us directly to find out the latest status. A lab tour is always possible without obligation.

Students who would like to write their thesis with us are of course very welcome.

There are many smaller and larger projects that can be carried out in our attosecond laboratory in room W2 0-025 with the shortest laser pulses and our own electron microscope. Previous experience is not necessary, but an interest in learning new things and mastering somewhat more complex measurement setups is certainly beneficial. From femtosecond laser systems to vacuum systems, from attosecond pulses in the ultraviolet to time-resolved electron microscopy on nanostructures, a wide variety of techniques can be tried out.

Just get in touch with us. We will be happy to show you around the lab without obligation and talk about current opportunities for theses. If you already have a concrete idea of what you would like to study, we will of course also take your wishes into account. And since the question comes up often: As an independent junior research group, we can supervise Bachelor's, Master's and doctoral theses in the same way as other groups whose leaders already have the title of professor. However, a second examiner with a title can of course be chosen.

Below is a (by no means exhaustive) list of potential topics to give you a better idea of what you can learn with us.

Photoemission electron microscopy (PEEM) differs somewhat from conventional microscopy techniques. In this case, the sample is also the electron source, in that electrons are triggered from it - by illumination with short laser pulses. If first a laser pulse is used for optical excitation and then a second one to interrogate the dynamics after a variable waiting period, the electrons carry valuable information about the charge carrier dynamics at the time of triggering after emission.

The trigger locations of the electrons are imaged in the microscope with high spatial resolution. At the same time, the time of flight of the electrons is recorded, so that their kinetic energy spectrum is also measured. This allows us to gain detailed insights into the charge carrier dynamics near the surface of a nanostructure after optical excitation.

We have recently commissioned our PEEM and are now offering various projects on different samples as final theses. Techniques used include sample preparation, nanopositioning systems, ultra-high vacuum, electron microscopy, time-of-flight electron spectroscopy and excitation-interrogation experiments with short laser pulses. Please contact us if you would like to do something at PEEM and we will tell you what particularly exciting samples are currently available. You can then prepare them yourself, investigate them in PEEM in a time-resolved manner and evaluate the data for your thesis. In the best case scenario, the result will be a first scientific publication.

The aim of this project is to generate high harmonics with a spectral width of only 100 meV. For this purpose, an existing laser system is to be expanded and a new, more compact beamline for high harmonics / attosecond pulses is to be set up. Sounds complicated? It is ;) But: The support we provide is very close, the project is already very precisely planned and we adapt the scope as progress is made. So it's ultimately a great opportunity to learn lots of new things. Provided you are highly motivated. Talk to us without obligation!

We currently have two interferometers in our group that require active stabilization in order to remain stable for hours. The two interferometers are very different: one is part of the laser system and determines the phase between the carrier frequency and the envelope of all laser pulses used in the laboratory. The other is responsible for our attosecond experiments and here it is important to keep the time delay stable in an experiment. You should enjoy working with lasers in both cases, but you don't need to have any previous experience.

Feel free to contact us if there is something for you in the proposed projects. And feel free to contact us if no project appeals to you directly. Sometimes we come up with spontaneous project ideas or a project seems different after we've done a little lab tour.

With us there is

• Intensive supervision, support for the whole group
• the opportunity to try out many new devices and techniques
• first own research results
• an exciting final project

Please contact Katrin or Jan.