Št. zadetkov: 10
Izvirni znanstveni članek
Oznake:
kvantna mehanika;fizika kondenzirane snovi;quantum mechanics;condensed matter physics;
The effects of a local magnetic field on nonequilibrium stationary states (NESSs) of the open quantum XXZ spin chain are investigated with a Lindblad master equation approach in the limit of strong dissipation. The local magnetic field is applied to a single bulk spin of the chain while the ends are ...
Leto:
2019
Vir:
Fakulteta za matematiko in fiziko (UL FMF)
Izvirni znanstveni članek
Oznake:
kvantna mehanika;odprti kvantni sistemi;nelinearna dinamika;quantum mechanics;open quantum systems;nonlinear dynamics;
We consider an open quantum system with dissipation, described by a Lindblad Master equation (LME). For dissipation locally acting and sufficiently strong, a separation of the relaxation timescales occurs, which, in terms of the eigenvalues of the Liouvillian, implies a grouping of the latter in dis ...
Leto:
2021
Vir:
Fakulteta za matematiko in fiziko (UL FMF)
Izvirni znanstveni članek
Oznake:
statistična fizika;neravnovesna statistična mehanika;odprti kvantni sistemi;statistical physics;nonequilibrium statistical mechanics;open quantum systems;
We investigate a dissipatively driven XYZ spin-1/2 chain in the Zeno limit of strong dissipation, described by Lindblad master equation. The nonequilibrium steady state is expressed in terms of a matrix product ansatz using novel site-dependent Lax operators. The components of Lax operators satisfy ...
Leto:
2020
Vir:
Fakulteta za matematiko in fiziko (UL FMF)
Izvirni znanstveni članek
Oznake:
statistična fizika;odprti kvantni sistemi;kvantne spinske verige;statistical physics;open quantum systems;quantum spin chains;
We find novel site-dependent Lax operators in terms of which we demonstrate exact solvability of a dissipatively driven XYZ spin-1/2 chain in the Zeno limit of strong dissipation, with jump operators polarizing the boundary spins in arbitrary directions. We write the corresponding nonequilibrium ste ...
Leto:
2020
Vir:
Fakulteta za matematiko in fiziko (UL FMF)
Izvirni znanstveni članek
Oznake:
kvantna mehanika;quantum mechanics;
We demonstrate the existence of a special chiral “phantom” mode with some analogy to a Goldstone mode in the anisotropic quantum XXZ Heisenberg spin chain. The phantom excitations contribute zero energy to the eigenstate, but a finite fixed quantum of momentum $k_0$. The mode exists not due to symme ...
Leto:
2021
Vir:
Fakulteta za matematiko in fiziko (UL FMF)
Magistrsko delo
Oznake:
celični avtomati;dinamični sistem Box-Ball;solitoni;stacionarno stanje;Schmidtovi ranki;korelacije;pomožni prostor;parcialne matrike;
V magistrskem delu je predstavljen deterministični dinamični sistem Box-Ball (BBS), sklopljen s stohastičnim Markovskim rezervoarjem. Rezervoar predstavlja robni pogoj, kjer stohastično nastajajo žoge v sistemu. Dinamika tega sklopljenega sistema je drugačna od klasičnega BBS in zato potrebujemo def ...
Leto:
2024
Vir:
Fakulteta za matematiko in fiziko (UL FMF)
Izvirni znanstveni članek
Oznake:
statistična fizika;fizika kondenzirane snovi;spinske verige;statistical physics;condensed matter physics;spin chains;
We describe the dynamics of a transverse spin-helix state—a product state with spatially rotating magnetization—under XXZ spin chain evolution. Due to experimental relevance we especially focus on magnetization dynamics. At long times the $U$(1) symmetry of the Hamiltonian is restored, leading to th ...
Leto:
2023
Vir:
Fakulteta za matematiko in fiziko (UL FMF)
Izvirni znanstveni članek
Oznake:
kvantna mehanika;odprti kvantni sistemi;markovski procesi;quantum mechanics;open quantum systems;Markov processes;
We consider an open quantum system, with dissipation applied only to a part of its degrees of freedom, evolving via a quantum Markov dynamics. We demonstrate that, in the Zeno regime of large dissipation, the relaxation of the quantum system towards a pure quantum state is linked to the evolution of ...
Leto:
2020
Vir:
Fakulteta za matematiko in fiziko (UL FMF)
Izvirni znanstveni članek
Oznake:
In this paper we study the statistical properties of a reversible cellular automaton in two out-of-equilibrium settings. In the first part we consider two instances of the initial value problem, corresponding to the inhomogeneous quench and the local quench. Our main result is an exact matrix produc ...
Leto:
2019
Vir:
Fakulteta za matematiko in fiziko (UL FMF)
Izvirni znanstveni članek
Oznake:
kvantna mehanika;quantum mechanics;
We analyze a XXZ spin-1/2 chain which is driven dissipatively at its boundaries. The dissipative driving is modeled by Lindblad jump operators which only act on both boundary spins. In the limit of large dissipation, we find that the boundary spins are pinned to a certain value and at special values ...
Leto:
2020
Vir:
Fakulteta za matematiko in fiziko (UL FMF)