Entanglement spreading and quasiparticle picture beyond the pair structure

被引:17
作者
Bastianello, Alvise [1 ]
Collura, Mario [2 ]
机构
[1] Univ Amsterdam, Inst Theoret Phys, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands
[2] SISSA, Via Bonomea 265, I-34136 Trieste, Italy
基金
欧洲研究理事会;
关键词
QUANTUM; SYSTEMS;
D O I
10.21468/SciPostPhys.8.3.045
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The quasi-particle picture is a powerful tool to understand the entanglement spreading in many-body quantum systems after a quench. As an input, the structure of the excitations' pattern of the initial state must be provided, the common choice being pairwise-created excitations. However, several cases exile this simple assumption. In this work we investigate weakly-interacting to free quenches in one dimension. This results in a far richer excitations' pattern where multiplets with a larger number of particles are excited. We generalize the quasi-particle ansatz to such a wide class of initial states, providing a small-coupling expansion of the Renyi entropies. Our results are in perfect agreement with iTEBD numerical simulations.
引用
收藏
页数:24
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