Prof. RNDr. Václav Janiš, DrSc.
Condensed Matter Theory Department
Institute of Physics
Academy of Sciences of the Czech Republic
Na Slovance 2, CZ - 182 21 Prague
Professor of Theoretical Physics
Office: C440b, UTIA-Building
Phone: +420 26605 2153
Google Scholar, ORCID)
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 Fermi-liquid phase, (dynamical) mean-field 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, interaction-driven 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, metal-insulator transition
Theory of spin glasses and other random systems
Mean-field theory based on real replicas in the thermodynamic approach of Thouless, Anderson and Palmer for Ising and Heisenberg spin glasses and related models
Field-theoretic and diagrammatic methods for quantum two-particle functions
Feynman diagrams and many-body Green functions for nonrelativistic quantum interacting systems, advanced approximations for two-particle Green functions, vertex corrections, parquet approach to two-particle vertex functions
Interacting quantum dots attached to superconducting leads, Andreev bound states, 0-pi transition, perturbation theory with anomalous functions
( 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 many-particle systems I (hand written notes)
Statistical physics of quantum many-particle systems II (hand written notes)
Renormalization theory of phase transitions
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)1-14.
V. Janiš, V. Pokorný and M. Žonda, Spin-symmetric solution of an interacting quantum dot attached to superconducting leads: Andreev states and the 0-pi transition,
Eur. Phys. J. B 89, 197 (2016) 1-12.
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) 1-11.
V. Janiš, Introduction to Mean-Field Theory of Spin Glass Models, Lecture
Notes of the Autumn School on Correlated Electron Systems: Many-Body 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 mean-field spin-glass models, Phase Transitions 98, 4711 (2015) 1-19.
V. Janiš and V. Pokorný, Critical metal-insulator transition and divergence in a two-particle vertex in disordered and interacting electron systems, Phys. Rev. B 90, 045143 (2014) 1-11.
V. Pokorný and V. Janiš,Vertex corrections to the mean-field electrical conductivity in disordered electron systems,
J. Phys.: Condens. Matter 25 175502 (2013) 1-10.
V. Janiš, A. Kauch, and A. Klíč, Free energy of mean-field spin-glass models: Evolution operator and perturbation expansion, Phys. Rev. B 87, 054201 (2013) 1-11.