Zobrazeno 1 - 10
of 43
pro vyhledávání: '"Tsyplyatyev, Oleksandr"'
Autor:
Hansen, Max O., Palan, Yash, Hahn, Viktor, Thomson, Mark D., Warawa, Konstantin, Roskos, Hartmut G., Demsar, Jure, Pientka, Falko, Tsyplyatyev, Oleksandr, Kopietz, Peter
Publikováno v:
Phys. Rev. B 108, 045148 (2023)
We re-examine the effect of long-range Coulomb interactions on the collective amplitude and phase modes in the incommensurate charge-density-wave ground state of quasi-one-dimensional conductors. Using an effective action approach we show that the lo
Externí odkaz:
http://arxiv.org/abs/2303.08580
Publikováno v:
Phys. Rev. B 96, 064506 (2017)
We study the effect of critical pairing fluctuations on the electronic properties in the normal state of a clean superconductor in three dimensions. Using a functional renormalization group approach to take the non-Gaussian nature of critical fluctua
Externí odkaz:
http://arxiv.org/abs/1704.05282
Publikováno v:
Semicond. Sci. Technol. 31, 094003 (2016)
We find a superradiant quantum phase transition in the model of triangular molecular magnets coupled to the electric component of a microwave cavity field. The transition occurs when the coupling strength exceeds a critical value which, in sharp cont
Externí odkaz:
http://arxiv.org/abs/1502.04075
Publikováno v:
Phys. Rev. B 86, 195101 (2012)
Using the exact eigenstates of the inhomogeneous Dicke model obtained by numerically solving the Bethe equations, we study the decay of bosonic excitations due to the coupling of the mode to an ensemble of two-level (spin 1/2) systems. We compare the
Externí odkaz:
http://arxiv.org/abs/1209.0292
Autor:
Tsyplyatyev, Oleksandr, Loss, Daniel
Publikováno v:
Phys. Rev. Lett. 106, 106803 (2011)
The main source of decoherence for an electron spin confined to a quantum dot is the hyperfine interaction with nuclear spins. To analyze this process theoretically we diagonalize the central spin Hamiltonian in the high magnetic B-field limit. Then
Externí odkaz:
http://arxiv.org/abs/1102.2426
Publikováno v:
Phys. Rev. B 82, 092203 (2010)
We present an elementary derivation of the exact solution (Bethe-Ansatz equations) of the Dicke model, using only commutation relations and an informed Ansatz for the structure of its eigenstates.
Comment: 2 pages
Comment: 2 pages
Externí odkaz:
http://arxiv.org/abs/1008.1844
Autor:
Tsyplyatyev, Oleksandr, Loss, Daniel
Publikováno v:
Phys. Rev. B 82, 024305 (2010)
We show that in the few-excitation regime the classical and quantum time-evolution of the inhomogeneous Dicke model for N two-level systems coupled to a single boson mode agree for N>>1. In the presence of a single excitation only, the leading term i
Externí odkaz:
http://arxiv.org/abs/1002.3932
Autor:
Tsyplyatyev, Oleksandr, Loss, Daniel
Publikováno v:
Phys. Rev. A 80, 023803 (2009)
We study the time dynamics of a single boson coupled to a bath of two-level systems (spins 1/2) with different excitation energies, described by an inhomogeneous Dicke model. Analyzing the time-dependent Schrodinger equation exactly we find that at r
Externí odkaz:
http://arxiv.org/abs/0811.2386
Publikováno v:
Phys. Rev. B 79, 132504 (2009)
We study the time evolution of a system of fermions with pairing interactions at a finite temperature. The dynamics is triggered by an abrupt increase of the BCS coupling constant. We show that if initially the fermions are in a normal phase, the amp
Externí odkaz:
http://arxiv.org/abs/0712.4280
Publikováno v:
Phys. Rev. Lett. 96, 097005 (2006)
We determine the limiting dynamics of a fermionic condensate following a sudden perturbation for various initial conditions. We demonstrate that possible initial states of the condensate fall into two classes. In the first case, the order parameter a
Externí odkaz:
http://arxiv.org/abs/cond-mat/0511621