Details

Autor(en) / Beteiligte

• Hebenstreit, F.
• Banerjee, D.
• Hornung, M.
• Jiang, F.-J.
• Schranz, F.
• Wiese, U.-J.

Titel

Real-time dynamics of open quantum spin systems driven by dissipative processes

Ist Teil von

• Physical review. B, Condensed matter and materials physics, 2015-07, Vol.92 (3), Article 035116

Erscheinungsjahr

2015

Link zum Volltext

Quelle

PROLA - Physical Review Online Archive

Beschreibungen/Notizen

• We study the real-time evolution of large open quantum spin systems in two spatial dimensions, whose dynamics is entirely driven by a dissipative coupling to the environment. We consider different dissipative processes and investigate the real-time evolution from an ordered phase of the Heisenberg or XY model towards a disordered phase at late times, disregarding unitary Hamiltonian dynamics. The corresponding Kossakowski-Lindblad equation is solved via an efficient cluster algorithm. We find that the symmetry of the dissipative process determines the time scales, which govern the approach towards a new equilibrium phase at late times. Most notably, we find a slow equilibration if the dissipative process conserves any of the magnetization Fourier modes. In these cases, the dynamics can be interpreted as a diffusion process of the conserved quantity.