Wouters B, De Nardis J, Brockmann M, Fioretto D, Rigol M, Caux J-S
Institute for Theoretical Physics, University of Amsterdam, Science Park 904, Postbus 94485, 1090 GL Amsterdam, Netherlands.
Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
Phys Rev Lett. 2014 Sep 12;113(11):117202. doi: 10.1103/PhysRevLett.113.117202. Epub 2014 Sep 9.
We study quenches in integrable spin-1/2 chains in which we evolve the ground state of the antiferromagnetic Ising model with the anisotropic Heisenberg Hamiltonian. For this nontrivially interacting situation, an application of the first-principles-based quench-action method allows us to give an exact description of the postquench steady state in the thermodynamic limit. We show that a generalized Gibbs ensemble, implemented using all known local conserved charges, fails to reproduce the exact quench-action steady state and to correctly predict postquench equilibrium expectation values of physical observables. This is supported by numerical linked-cluster calculations within the diagonal ensemble in the thermodynamic limit.
我们研究了可积自旋-1/2链中的猝灭过程，其中我们用各向异性海森堡哈密顿量演化反铁磁伊辛模型的基态。对于这种非平凡相互作用的情况，基于第一性原理的猝灭作用方法的应用使我们能够在热力学极限下对猝灭后的稳态给出精确描述。我们表明，使用所有已知的局域守恒电荷实现的广义吉布斯系综无法重现精确的猝灭作用稳态，也无法正确预测物理可观测量的猝灭后平衡期望值。这在热力学极限下对角系综内的数值链接簇计算中得到了支持。
