| Autor: |
Tenório, Antônio S. F., Montenegro-Filho, R. R., Coutinho-Filho, M. D. |
| Rok vydání: |
2016 |
| Předmět: |
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| Zdroj: |
Phys. Rev. B 80, 054409 (2009) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevB.80.054409 |
| Popis: |
We present the ground state phase diagram of $q = 1/2$ quantum-rotor chains with competing interactions (frustration) calculated through cluster variational mean field approaches. We consider two interaction patterns, named F$_1$ and F$_2$ models, between the quantum-rotor momentum and position operators, which follow exchange patterns of known one-dimensional spin-1/2 systems with a ferrimagnetic state in their phase diagrams. The spin-1/2 F$_1$ model is known as the diamond chain and is related to the azurite compound, while the spin-1/2 F$_2$ model was recently shown to present a frustration-induced condensation of magnons. We provide a detailed comparison between the quantum-rotor phase diagrams, in single- and multi-site mean-field approaches, and known results for the spin-1/2 models, including exact diagonalization and density matrix renormalization group data for these systems, as well as phase diagrams of the associated classical models. |
| Databáze: |
arXiv |
| Externí odkaz: |
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