Articolo in rivista, 2015, ENG, 10.1088/1367-2630/17/2/023066

Full decoherence induced by local fields in open spin chains with strong boundary couplings

Vladislav Popkov (1,6); Mario Salerno (2); Roberto Livi (1,3,4,5)

(1) Dipartimento di Fisica e Astronomia, Università di Firenze, via G. Sansone 1, I-50019 Sesto Fiorentino, Italy (2) Dipartimento di Fisica 'E. R. Caianiello', CNISM and INFN Gruppo Collegato di Salerno, Università di Salerno, via Giovanni Paolo II Stecca 8-9, I-84084, Fisciano (SA), Italy (3) Max Planck Institute for the Physics of Complex Systems, Nöthnitzer Straße 38, D-01187 Dresden, Germany (4) INFN, Sezione di Firenze, and CSDC Università di Firenze, via G.Sansone 1, I-50019 Sesto Fiorentino, Italy (5) ISC-CNR, via Madonna del Piano 10, I-50019 Sesto Fiorentino, Italy (6) Institut für Theoretische Physik, Universität zu Köln, Zülpicher Str. 77, D-50937 Cologne, Germany

We investigate an open XYZ spin-1/2 chain driven out of equilibrium by boundary reservoirs targeting different spin orientations, aligned along the principal axes of anisotropy. We show that by tuning local magnetic fields, applied to spins at sites near the boundaries, one can change any nonequilibrium steady state to a fully uncorrelated Gibbsian state at infinite temperature. This phenomenon occurs for strong boundary coupling and on a critical manifold in the space of the fields amplitudes. The structure of this manifold depends on the anisotropy degree of the model and on the parity of the chain size.

New journal of physics 17 (February), pp. 023066–?

Keywords

driven quantum spin chains, nonequilibrium steady states, decoherence phenomenon, Lindblad master equation, boundary gradients, Zeno regime

CNR authors

Livi Roberto

CNR institutes

ISC – Istituto dei sistemi complessi