Modulated phase of a Potts model with competing interactions on a Cayley tree

Ganikhodjaev, Nasir and Temir, Seyit and Akin, Hasan (2010) Modulated phase of a Potts model with competing interactions on a Cayley tree. In: IIUM Research, Innovation & Invention Exhibition (IRIIE 2010), 26 - 27 January 2010, Kuala Lumpur.

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Abstract

We study the phase diagram for Potts model on a Cayley tree with competing nearest-neighbor interactions J1, prolonged next-nearest-neighbor interactions Jp and one-level next-nearest-neighbor interactions Jo. Vannimenus proved that the phase diagram of Ising model with Jo = 0 contains a modulated phase, as found for similar models on periodic lattices, but the multi critical Lifshitz point is at zero temperature. Later Mariz et al. generalized this result for Ising model with Jo ≠ 0 and recently Ganikhodjaev et al. proved similar result for the three-state Potts model with Jo = 0. We consider Potts model with Jo ≠ 0 and show that for some values of Jo the multi critical Lifshitz point be at non-zero temperature. We also prove that as soon as the same-level interaction Jo is non zero, the paramagnetic phase found at high temperatures for Jo = 0 disappears, while Ising model does not obtain such property. To perform this study, an iterative scheme similar to that appearing in real space renormalization group frameworks is established; it recovers, as particular case, previous work by Ganikhodjaev et al. for Jo = 0. At vanishing temperature, the phase diagram is fully determined for all values and signs of J1,Jp and Jo. At finite temperatures several interesting features are exhibited for typical values of Jo /J1.

Item Type:	Conference or Workshop Item (Poster)
Additional Information:	4430/13888
Uncontrolled Keywords:	Potts model · Cayley tree · Phase diagram · Next-nearest-neighbour · Modulated phase
Subjects:	Q Science > QA Mathematics
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science > Department of Computational and Theoretical Sciences
Depositing User:	Prof. Nasir Ganikhodjaev
Date Deposited:	07 Feb 2012 13:02
Last Modified:	09 Apr 2012 08:35
URI:	http://irep.iium.edu.my/id/eprint/13888

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