期刊
PHYSICAL REVIEW A
卷 79, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.79.022302
关键词
ground states; information theory; many-body problems; phase transformations; quantum entanglement; solitons
资金
- National Research Foundation
- Ministry of Education, Singapore
- EPSRC
- Royal Society
- Wolfson Foundation
We investigate the buildup of quasi-long-range order in the XX chain with a transverse magnetic field at finite size. As the field is varied, the ground state of the system displays multiple level crossings producing a sequence of entanglement jumps. Using the partial fidelity and susceptibility, we study the transition to the thermodynamic limit and argue that the topological order can be described in terms of kink-antikink pairs and marked by edge spin entanglement.
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