Prof. RNDr. Václav Janiš, DrSc.
Head of Condensed Matter Theory Department
Institute of Physics
Academy of Sciences of the Czech Republic
Na Slovance 2, CZ  182 21 Prague
Czech Republic
and
Professor of Theoretical Physics
at
Charles University
Office: C440b, UTIABuilding
Phone: +420 26605 2153
Email: janis.at.fzu.cz
Vita
Research
Publications
(
Google Scholar, ORCID)
 
Research interests:
Theory of strongly correlated electrons
Model description of electron correlations, Hubbard and Anderson impurity models, collective and cooperative phenomena, transition from weak to strong coupling regimes, breakdown of Fermiliquid phase, (dynamical) meanfield theory for intermediate and strong coupling, Kondo and insulating regimes; implementation of electron correlations in realistic calculational schemes
Quantum coherence and quantum phase transitions in itinerant systems
Quantitative description of quantum criticality, interactiondriven quantum phase transitions in metals, effects of noncommutativity of relevant operators on critical behavior, formation of bound and resonant pair states, structure of order parameters of quantum phases, transverse magnetic order, superconductivity
Transport properties of disordered electron systems
Vertex corrections in the electrical conductivity in impure metals, quantum diffusion and coherence, diagrammatic theory of weak and strong electron localization, metalinsulator transition
Theory of spin glasses and other random systems
Meanfield theory based on real replicas in the thermodynamic approach of Thouless, Anderson and Palmer for Ising and Heisenberg spin glasses and related models
Fieldtheoretic and diagrammatic methods for quantum twoparticle functions
Feynman diagrams and manybody Green functions for nonrelativistic quantum interacting systems, advanced approximations for twoparticle Green functions, vertex corrections, parquet approach to twoparticle vertex functions
Superconducting nanostructures
Interacting quantum dots attached to superconducting leads, Andreev bound states, 0pi transition, perturbation theory with anomalous functions
University courses:
( Faculty of Mathematics and Physics of Charles University)
Thermodynamics and Statistical Physics I (course in Czech)
Thermodynamics and Statistical Physics II (course in Czech)
Statistical physics of quantum manyparticle systems I (hand written notes)
Statistical physics of quantum manyparticle systems II (hand written notes)
Renormalization theory of phase transitions
Study opportunities
Diploma theses
PhD theses
Research opportunities
Postdoc positions
Selected recent publications
V. Janiš, A. Kauch and V. Pokorný, Themodynamically consistent description of criticality in moels of correlated electrons, Phys. Rev. B 95, 045108 (2017)114.
V. Janiš, V. Pokorný and M. Žonda, Spinsymmetric solution of an interacting quantum dot attached to superconducting leads: Andreev states and the 0pi transition,
Eur. Phys. J. B 89, 197 (2016) 112.
V. Janiš and J. Kolorenč, Conserving approximations for response functions of the Fermi gas in a random potential, Eur. Phys. J. B 89, 170 (2016) 111.
V. Janiš, Introduction to MeanField Theory of Spin Glass Models, Lecture
Notes of the Autumn School on Correlated Electron Systems: ManyBody Physics: From Kondo to Hubbard (E. Pavarini, E. Koch and P. Coleman eds.), Chap. 8, Schriften des Forschungszentrums Jülich, Reihe Modeling and Simulation, Vol. 5, Jülich 2015.
V. Janiš, A. Kauch and A. Klíč, Ergodicity breaking in frustrated disordered systems: Replicas in meanfield spinglass models, Phase Transitions 98, 4711 (2015) 119.
V. Janiš and V. Pokorný, Critical metalinsulator transition and divergence in a twoparticle vertex in disordered and interacting electron systems, Phys. Rev. B 90, 045143 (2014) 111.
V. Pokorný and V. Janiš,Vertex corrections to the meanfield electrical conductivity in disordered electron systems,
J. Phys.: Condens. Matter 25 175502 (2013) 110.
V. Janiš, A. Kauch, and A. Klíč, Free energy of meanfield spinglass models: Evolution operator and perturbation expansion, Phys. Rev. B 87, 054201 (2013) 111.
