Zobrazeno 1 - 10
of 138
pro vyhledávání: '"Yuzbashyan, Emil"'
Using standard kinetic equations, we show that the thermal equilibrium between conduction electrons and phonons is unstable when the renormalized electron-phonon coupling exceeds a certain threshold. We prove that negative electronic specific heat, $
Externí odkaz:
http://arxiv.org/abs/2409.19562
We study the relationship between integrable Landau-Zener (LZ) models and Knizhnik-Zamolodchikov (KZ) equations. The latter are originally equations for the correlation functions of two-dimensional conformal field theories, but can also be interprete
Externí odkaz:
http://arxiv.org/abs/2409.17053
The dispersionless limit of the standard Eliashberg theory of superconductivity is studied. The effective electron-electron interactions are mediated by Einstein phonons of frequency $\Omega>0$, equipped with electron-phonon coupling strength $\lambd
Externí odkaz:
http://arxiv.org/abs/2409.02121
The standard Eliashberg theory of superconductivity is studied. The effective electron-electron interactions are mediated by dispersive phonons, with Eliashberg spectral function $\alpha^2 F(\omega)\geq 0$ that is $\propto\omega^2$ for small $\omega>
Externí odkaz:
http://arxiv.org/abs/2409.00532
Using the recent reformulation for the Eliashberg theory of superconductivity in terms of a classical interacting Bloch spin chain model, rigorous upper and lower bounds on the critical temperature $T_c$ are obtained for the $\gamma$ model -- a versi
Externí odkaz:
http://arxiv.org/abs/2409.00533
We establish fundamental upper bounds on the electron-phonon interaction strength and superconducting transition temperature $T_c$ in metals stemming from an intrinsic instability of the equilibrium between electrons and the crystal lattice with resp
Externí odkaz:
http://arxiv.org/abs/2407.12922
Publikováno v:
Chaos 34, 033107 (2024)
We use the Toda chain model to demonstrate that numerical simulation of integrable Hamiltonian dynamics using time discretization destroys integrability and induces dynamical chaos. Specifically, we integrate this model with various symplectic integr
Externí odkaz:
http://arxiv.org/abs/2308.00443
Publikováno v:
Phys. Rev. B 106, 104513 (2022)
We show that the classical (mean-field) description of far from equilibrium superconductivity is exact in the thermodynamic limit for local observables but breaks down for global quantities, such as the entanglement entropy or Loschmidt echo. We do t
Externí odkaz:
http://arxiv.org/abs/2208.07320
We study the Loschmidt echo in the quenched two-dimensional $p$-wave topological superconductor. We find that if this superconductor is quenched out of the critical point separating its topological and non-topological phases into either of the two ga
Externí odkaz:
http://arxiv.org/abs/2207.08131
Publikováno v:
Phys. Rev. B 106, 064502 (2022)
We study fermions at quantum criticality with extremely retarded interactions of the form $V(\omega_l)=(g/|\omega_l|)^\gamma$, where $\omega_l$ is the transferred Matsubara frequency. This system undergoes a normal-superconductor phase transition at
Externí odkaz:
http://arxiv.org/abs/2206.07575