Andrej Vlček

Data enthusiast.
Master student of Physics in Regensburg.
FKS alumni.

me

I am a dedicated and passionate learner, especially when it comes to physics or any other kind of natural science. Alongside my physics studies, I developed a set of programming skills which I would like to apply in my professional future.

My natural curiousity for the world around us was nurtured by the Physics Correspondence seminar (FKS), in which I participated as a contestant during my high school studies and even won. During my bachelor studies in Breatislava, I wanted to pay back the next generations the physics education, ability to meet like-minded comrades and the atmosphere at the physics camps, so I volunteered and organized a lot for FKS. This time during my studies at Comenius university belongs to one of the happiest in my whole life.

However, a challenge came across my life and I decided to continue my education in Regensburg, Bavaria, at a well-established university with a great scientific potential, which Bratislava could not offer me. Besides physics and German, I learned much about myself and my culture and have grown stronger.

Looking back at my roots, studies at the bilingual English-Slovak high school developed both my skills and enthusiasm for English. My favourite authors include Oscar Wilde and Jane Austen. As I was raised in a mountainous and rather rural part of Slovakia, Liptov, I find gardening relaxing and I miss the High Tatras' silhouette on the horizon. Although I appreciate tranquilizing countryside, I enjoy living in a city for its cultural opportunities, such as going to opera house, or for my fascination by architecture.

Communication

good team communication skills gained through my experience as director of Physics correspondence seminar

great explanation skills gained through lecturing physics in summer schools organized by Physics correspondence seminar, writing and proofreading solutions to problems and participation in Young Physicists' Tournament

Organisational

very good organisational and team-leading skills gained as executive director of Physics correspondence seminar, chief organizer of several educational camps

Languages

English: C1 state examination

German: B2

Spanish: A2

Computer

C, Python intermediate

LaTeX, Matlab upper-intermediate

Mathematica, HTML basics

intermediate Linux user

Structural aspects of FeSi
Abstract EN, SK, Full pdf, Defense pdf

My thesis attempted to explain 7-fold coordination of iron and silicon atoms in the crystal structure of FeSi inspired by Pauling's paper. Our goal is to obtain a deeper understanding of the resonance phenomenon in FeSi. I began with constructing the space group of FeSi from its generators and proved its closure by constructing the multiplication table of the group.

The first part of the thesis, I analyzed the number of possible resonating rings in the FeSi structure. We narrowed down the problem to the periodically repeated unit unit cell (8 atoms) and formulated it in graph theory terms.

6 colorings
I found that there are 12 colorings with the maximal number of resonating rings, that is 16 out of 24 rings of length 4, by brute force trying all the possible colorings. Half of the 12 final coloring you can see, the rest might be obtained by color inversion of these.

In the second part, I found an explicit construction of the sp3d3 hybridization for iron in the FeSi structure. The hybrid orbitals are chosen so that they are oriented towards the 7 nearest neighbours of the iron atom in FeSi. sp3d3 hybridization