Prof. RNDr. Václav Janiš, DrSc.

Theoretical physics should explain Nature and her behavior not merely describe her (P. W. Anderson)

Research area & expertise:
Condensed Matter Theory


  • Research interests:
  • Theory of strongly correlated electrons
Model description of electron correlations, Hubbard and Anderson impurity models, collective and cooperative phenomena, the 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 calculation schemes
  • Quantum coherence and quantum phase transitions in itinerant systems
Quantitative description of quantum criticality, interaction-driven quantum phase transitions in metals, effects of non-commutativity of relevant operators on critical behavior, formation of bound and resonant pair states, the 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
  • Superconducting nanostructures
Interacting quantum dots attached to superconducting leads, Andreev bound states, 0-pi transition, perturbation theory with anomalous functions.

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Senior scientist at
the Theory Group of the Department of Dielectrics, Institute of Physics
of
The Czech Academy of Sciences
and
Professor of Theoretical Physics at
Faculty of Mathematics and Physics
of
Charles University
in
Prague


Office    Office: C436, UTIA-Building

Phone   Phone: +420 26605 2771

E-mail   Email: janis.at.fzu.cz


Vita    Personal data




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