Dr. Ludvík Smrčka, Institute of Physics, Czech Academy of Sciences, Prague
My main field of interest is the theoretical solid state physics, namely the electronic structure and transport properties of low-dimensional semiconductor structures, the Shubnikov-de Haas oscillations of transport coefficients, the quantum Hall effect and other transport phenomena.
In early nineties MBE-grown GaAs/AlGaAs heterostructures and quantum wells became available in our Institute and their in-house experimental investigation turned out to be difficult. We were interested in changes of topology of Fermi lines (Lifshitz phase transition) in wide quantum wells and double wells induced by the in-plane component of applied magnetic fields. Our theoretical estimates predicted that the critical fields at which the splitting of a single Fermi line into two parts occur well above 10 Tesla, the field at that time available in Prague.
This is why we applied for magnet time in the Grenoble High Magnetic Field Laboratory (former name of the LNCMI Grenoble), for the first time in 1996. Our first visit was mediated by Prof. Jack Bass from the Michigan State University, who spent there his sabbatical and served as our first local contact. Later on we continued our research in a long series of short visits which persists till present days. Our research on the transport properties of quantum wells and double wells was later extended to the three dimensional semiconductor superlattices in which another Lifshitz phase transition can be observed, the closed Fermi surfaces can be converted to corrugated cylinder by sample illumination. Presently, we are investigating graphite and graphene on the Si side of SiC.&nb
It is obvious that without a close collaboration with the LNCMI Grenoble, the program mentioned above could not be realized. Moreover, not only me but also my colleagues and students consider the LNCMI Grenoble as a well organized place for research and have found our short visits very pleasant and fruitful.