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Spin frustration and fermionic entanglement in an exactly solved hybrid diamond chain with the localized Ising spins and mobile electrons

Authors
  • Torrico, J.
  • Rojas, M.
  • Pereira, M. S. S.
  • Strecka, J.
  • Lyra, M. L.
Type
Preprint
Publication Date
Sep 04, 2015
Submission Date
Sep 04, 2015
Identifiers
DOI: 10.1103/PhysRevB.93.014428
Source
arXiv
License
Yellow
External links

Abstract

The strongly correlated spin-electron system on a diamond chain containing localized Ising spins on its nodal lattice sites and mobile electrons on its interstitial sites is exactly solved in a magnetic field using the transfer-matrix method. We have investigated in detail all available ground states, the magnetization processes, the spin-spin correlation functions around an elementary plaquette, fermionic quantum concurrence and spin frustration. It is shown that the fermionic entanglement between mobile electrons hopping on interstitial sites and the kinetically-induced spin frustration are closely related yet independent phenomena. In the ground state, quantum entanglement only appears within a frustrated unsaturated paramagnetic phase, while thermal fluctuations can promote some degree of quantum entanglement above the non-frustrated ground states with saturated paramagnetic or classical ferrimagnetic spin arrangements.

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