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Zero-Temperature Study of a Tetrameric Spin-1/2 Chain in a Transverse Magnetic Field

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Title
Zero-Temperature Study of a Tetrameric Spin-1/2 Chain in a Transverse Magnetic Field
Author(s)
Javad Vahedi; M. Shabani Arbousara; S. Mahdavifar
Publication Date
2017-02
Journal
JOURNAL OF LOW TEMPERATURE PHYSICS, v.186, no.3, pp.217 - 232
Publisher
SPRINGER/PLENUM PUBLISHERS
Abstract
We consider an alternating Heisenberg spin-1/2 antiferromagnetic–ferromagnetic chain with the space-modulated dominant antiferromagnetic exchange and anisotropic ferromagnetic coupling (tetrameric spin-1/2 chain). The zero-temperature effect of a symmetry breaking transverse magnetic field on the model is studied numerically. It is found that the anisotropy effect on the ferromagnetic coupling induces two new gapped phases.We identified their orderings as a kind of the stripe antiferromagnetic phase. As a result, the magnetic phase diagram of the tetrameric chain shows five gapped quantum phases, and the system is characterized by four critical fields which mark quantum phase transitions in the ground state of the system with the changing transverse magnetic field. We have also exploited the well-known bipartite entanglement (name as concurrence) and global entanglement tools to verify the occurrence of quantum phase transitions and the corresponding critical points. © Springer Science+Business Media New York 2016
URI
https://pr.ibs.re.kr/handle/8788114/3198
ISSN
0022-2291
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > Journal Papers (저널논문)
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