Ph.D. Andreas Stier

Courses and Dates

Offered Bachelor’s or Master’s Theses Topics

Imaging magnetic phases in 2D-materials

The field of van der Waals heterostructures, which are stacks on individual atomically thin crystal sheets, has exploded in the last decade. Comparable to a game of Nano- Lego, those van der Waals stacks can be assembled in such a way that yield electro-optical nano-devices with essentially unlimited functionalities. Further, clever stacking can also result in new, fundamental physics.

The principal goal of this Masters thesis is to image magnetic phases of novel 2D-materials with a nitrogen-vacancy-based quantum camera system.

During the project, you will work in close collaboration with a small team of Ph.D.
students and postdocs, therefore individual effort is key to drive this Masters's project.

Some knowledge in the areas of van der Waals stacking, optics or cleanroom fabrication will be beneficial, but secondary to your personal motivation and commitment to this project.

You should:

(1) Be highly motivated and self-driven, (2) be practically minded with a get-things-done attitude, (3) enjoy working across a wide range of tasks (processing, optics, electronics) and (4) be willing to work in a very small team on challenging things very long hours ...

You will get:

(1) the chance to work on current hot-topic issues in the area of 2D van der Waals physics (2) gain highly sought after abilities in the field of quantum technologies (3) a sound understanding of the physics in atomically thin materials and hopefully (4) a few nice papers.

suitable as

• Master’s Thesis Quantum Science & Technology

Supervisor: Jonathan Finley

Spectroscopy on atomically thin materials in high pulsed magnetic fields

The field of van der Waals heterostructures, which are stacks on individual atomically thin crystal sheets, has exploded in the last decade. Comparable to a game of Nano-Lego, those van der Waals stacks can be assembled in such a way that yield electro-optical nano-devices with essentially unlimited functionalities. Further, clever stacking can also result in new, fundamental physics.

The principal goal of this Masters's thesis is to study the optical properties of actively tunable van der Waals heterostructures to examine topics such as exciton localization, many-body physics, exciton- exciton interactions, or the impact of complex dielectric environments on exciton properties in high to ultra-high magnetic fields.

Nano-LEGO

  

During the project you will work in close
collaboration with a small team of Ph.D. students
and postdocs, therefore individual effort is key to drive this Masters's project.

Some knowledge in the areas of van der Waals stacking, optics, or cleanroom fabrication will be beneficial, but secondary to your personal motivation and commitment to this project.

You should:

(1) Be highly motivated and self-driven, (2) be practically minded with a get-things-done attitude, (3) enjoy working across a wide range of tasks (processing, optics), and (4) be willing to work in a very small team on challenging things very long hours ...

You will get:

(1) the chance to work on current hot-topic issues in the area of 2D van der Waals physics (2) exposure to experiments in large scale magnetic field facilities (3) a sound understanding of the physics in atomically thin materials and hopefully (4) a few nice papers.

suitable as

• Master’s Thesis Quantum Science & Technology

Supervisor: Jonathan Finley

Spin-dynamics in magnetic 2D-materials

The field of van der Waals heterostructures, which are stacks on individual atomically thin crystal sheets, has exploded in the last decade. Specifically, magnetic 2D materials or heterostructures between different 2D materials have shown great promise for future information technology.

The principal goal of this Masters's thesis is to (i) enhance a currently available quantum camera system to enable coherent spin control of atomically thin materials (ii) image the spin lifetime and coherence times of magnetic phases of novel 2D-materials.

During the project you will work in close collaboration with a small team of Ph.D. students and postdocs, therefore individual effort is key to drive this Masters's project.

Some knowledge in the areas of van der Waals stacking, optics, electronics, or cleanroom fabrication will be beneficial, but secondary to your personal motivation and commitment to this project.

You should:

(1) Be highly motivated and self-driven, (2) be practically minded with a get-things-done attitude, (3) enjoy working across a wide range of tasks (processing, optics, electronics), and (4) be willing to work in a very small team on challenging things very long hours ...

You will get:

(1) the chance to work on current hot-topic issues in the area of 2D magnetism (2) gain highly sought after abilities in the field of quantum technologies (3) a sound understanding of the physics in atomically thin materials and hopefully (4) a few nice papers.

suitable as

• Master’s Thesis Quantum Science & Technology

Supervisor: Jonathan Finley

Tunable interlayer excitons in 2D heterostructures

The field of van der Waals heterostructures, which are stacks on individual atomically thin crystal sheets, has exploded in the last decade. Specifically, heterostructures between different 2D materials have shown the emergence of interlayer excitons, due to the separation of charges at the interface. Furthermore, a lateral potential landscape, the so-called moiré potential, emerges, trapping the excitons in an egg-box shaped potential. This results in a situation where a few interlayer excitons can interact with each other, resulting in novel quantum phases.

The principal goal of this Masters's thesis is to study the optical properties of actively strain-tunable van der Waals heterostructures to examine topics such as exciton localization, many-body physics, exciton-exciton interactions in relation to the in-plane moiré potential.

During the project you will work in close collaboration with a small team of Ph.D. students and postdocs, therefore individual effort is key to drive this Masters's project.

Some knowledge in the areas of van der Waals stacking, optics, electronics, data analysis, or cleanroom fabrication will be beneficial, but secondary to your personal motivation.

You should:

(1) Be highly motivated and self-driven, (2) be practically minded with a get-things-done attitude, (3) enjoy working across a wide range of tasks (processing, optics, electronics) and (4) be willing to work in a very small team on challenging things very long hours ...

You will get:

(1) the chance to work on current hot-topic issues in the area of van der Waals heterostructures (2) gain highly sought after abilities in the field of 2D materials (3) a sound understanding of the physics in atomically thin materials and hopefully (4) a few nice papers.

suitable as

• Master’s Thesis Quantum Science & Technology

Supervisor: Jonathan Finley