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B02: Nonlinear optics and coherent intersubband physics of cubic GaN/Al(Ga)N heterostructures

M.Sc. Mario Littmann

M. Sc. Mario Littmann, AG As

What is the challenge of my research project? Why am I eager to do it?

I am involved in the Project B02 of the TRR142 since January 2020 and continue the work of Michael Deppe. I try to fabricate cubic GaN/Al(Ga)N heterostructures on 3C-SiC substrates and investigate their properties. In particular, I try to realize superlattice structures that can perform intersubband transitions, especially at the telecom wavelength of 1.55 µm. For the fabrication of these samples, I use a Plasma assisted molecular beam epitaxy (PAMBE), which is specifically built to grow Group-III nitrides. The challenging part of this research is the fact that we try to grow the nitrides in the metastable cubic phase. The reason for this is to avoid the Quantum-confined Stark effect which reduces the efficiency of devices with a hexagonal crystal structure.

 Why did I choose this project?

I was already a part of Donat As group during my bachelor and master thesis. In that time, I gained a lot of knowledge in the field of cubic nitrides. This project is a great opportunity to use and expand my current experience.