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of 187
pro vyhledávání: '"Efetov, Konstantin A."'
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 the form of a chain of alternating instantons and anti-instantons. We
Externí odkaz:
http://arxiv.org/abs/2111.02346
Publikováno v:
Phys. Rev. B 103, 075121 (2021)
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 parameter in a form of a chain of alternating instantons and antiinst
Externí odkaz:
http://arxiv.org/abs/2011.12157
Publikováno v:
Phys. Rev. B 102, 075146 (2020)
The nonlinear supermatrix $\sigma $-model is widely used to understand the physics of Anderson localization and the level statistics in noninteracting disordered electron systems. In contrast to the general belief that the supersymmetry method applie
Externí odkaz:
http://arxiv.org/abs/2002.08963
Autor:
Efetov, Konstantin B.
Publikováno v:
JETP 129, 680 (2019)
The concept of the order parameter is extremely useful in physics. Here, I discuss extensions of this concept to cases when the order parameter is no longer a constant but fluctuates or oscillates in space and time. This allows one to describe in an
Externí odkaz:
http://arxiv.org/abs/1911.00921
Autor:
Efetov, Konstantin B.
Publikováno v:
Phys. Rev. B 100, 245128 (2019)
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 in both real and imaginary times. The average of the order parameter ov
Externí odkaz:
http://arxiv.org/abs/1905.04128
Autor:
Efetov, Konstantin B.
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 (coined Quantum Time Crystals) might be macroscopic and thermodynamically st
Externí odkaz:
http://arxiv.org/abs/1902.07520
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Publikováno v:
Phys. Rev. B 97, 165125 (2018)
Experiments carried over the last years on the underdoped cuprates have revealed a variety of symmetry-breaking phenomena in the pseudogap state. Charge-density waves, breaking of $C_{4}$ rotational symmetry as well as time-reversal symmetry breaking
Externí odkaz:
http://arxiv.org/abs/1802.00694
Publikováno v:
Phys. Rev. B 96, 054208 (2017)
Superbosonization formula aims at rigorously calculating fermionic integrals via employing supersymmetry. We derive such a supermatrix representation of superfield integrals and specify integration contours for the supermatrices. The derivation is es
Externí odkaz:
http://arxiv.org/abs/1705.07915
Publikováno v:
Phys. Rev. B 96, 014517 (2017)
Motivated by the recent observations of small Fermi energies and comparatively large superconducting gaps, present also on bands not crossing the Fermi energy (incipient bands) in iron-based superconductors, we analyse the doping evolution of superco
Externí odkaz:
http://arxiv.org/abs/1704.08185