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88 papers
Slowly decaying real-time oscillations in instanton crystal
Grigory A. Starkov, Konstantin B. Efetov
Instanton crystal is a fascinating phase which is encountered when the minimum of the free energy corresponds to a configuration with an imaginary-time-dependent order parameter in…
Phase transition into Instanton Crystal
Grigory A. Starkov, Konstantin B. Efetov
We propose a class of models exhibiting instanton crystal phase. In this phase, the minimum of the free energy corresponds to a configuration with an imaginary-time-dependent order…
Supersymmetry method for interacting chaotic and disordered systems: the SYK model
Tigran A. Sedrakyan, Konstantin B. Efetov
The nonlinear supermatrix -model is widely used to understand the physics of Anderson localization and the level statistics in noninteracting disordered electron systems. In con…
Mean-field thermodynamic quantum time-space crystal: spontaneous breaking of time-translation symmetry in a macroscopic fermion system
Konstantin B. Efetov
A model demonstrating existence of a thermodynamically stable quantum time-space crystal has been proposed and studied. This state is characterized by an order parameter periodic i…
Thermodynamic Quantum Time Crystals
Konstantin B. Efetov
Investigation of states with a periodic time dependence of physical quantities attracts a considerable interest now. Although it has been proposed initially that such states (coine…
Spin polarization and orbital effects in superconductor-ferromagnet structures
A. F. Volkov, F. S. Bergeret, K. B. Efetov
We study theoretically spontaneous currents and magnetic field induced in a superconductor-ferromagnet (S-F) bilayer due to direct and inverse proximity effects. The induced curren…