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Quantum instability and edge entanglement in the quasi-long-range order

Abstract:
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. © 2009 The American Physical Society.
Publication status:
Published

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Publisher copy:
10.1103/PhysRevA.79.022302

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Institution:
University of Oxford
Division:
MPLS
Department:
Physics
Sub department:
Atomic & Laser Physics
Role:
Author
Journal:
PHYSICAL REVIEW A More from this journal
Volume:
79
Issue:
2
Publication date:
2009-02-01
DOI:
EISSN:
1094-1622
ISSN:
1050-2947
Language:
English
Keywords:
Pubs id:
pubs:158415
UUID:
uuid:8d92d115-11e9-4941-86e7-9b42ef474aad
Local pid:
pubs:158415
Source identifiers:
158415
Deposit date:
2012-12-19

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