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- Title
Quantum phase transition in dimerised spin-1/2 chains.
- Authors
Das, Aparajita; Bhadra, Sreeparna; Saha, Sonali
- Abstract
Quantum phase transition in dimerised antiferromagnetic Heisenberg spin chain has been studied. A staircase structure in the variation of concurrence within strongly coupled pairs with that of external magnetic field has been observed indicating multiple critical (or critical like) points. Emergence of entanglement due to external magnetic field or magnetic entanglement is observed for weakly coupled spin pairs too in the same dimer chain. Though closed dimerised isotropic XXX Heisenberg chains with different dimer strengths were mainly explored, analogous studies on open chains as well as closed anisotropic (XX interaction) chains with tilted external magnetic field have also been studied.
- Subjects
QUANTUM phase transitions; QUANTUM spin models; HEISENBERG model; MAGNETIC fields; QUANTUM theory
- Publication
Quantum Information Processing, 2015, Vol 14, Issue 11, p4089
- ISSN
1570-0755
- Publication type
Article
- DOI
10.1007/s11128-015-1116-8