期刊
PHYSICAL REVIEW B
卷 94, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.94.024302
关键词
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资金
- EU (IP-SIQS)
- EU (STREP-QUIC)
- Scuola Normale Superiore (progetto interno Non-equilibrium dynamics of one-dimensional quantum systems)
- Oxford Martin School
- LabEX ENS-ICFP [ANR-10-LABX-0010/ANR-10-IDEX-0001-02 PSL*]
- Italian MIUR (FIRB) [RBFR12NLNA]
We investigate the evolution of string order in a spin-1 chain following a quantum quench. After initializing the chain in the Affleck-Kennedy-Lieb-Tasaki state, we analyze in detail how string order evolves as a function of time at different length scales. The Hamiltonian after the quench is chosen either to preserve or to suddenly break the symmetry which ensures the presence of string order. Depending on which of these two situations arises, string order is either preserved or lost even at infinitesimal times in the thermodynamic limit. The fact that nonlocal order may be abruptly destroyed, what we call string-order melting, makes it qualitatively different from typical order parameters in the manner of Landau. This situation is thoroughly characterized by means of numerical simulations based on matrix product states algorithms and analytical studies based on a short-time expansion for several simplified models.
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