Lahtinen, V. and Kells, G. and Carollo, Angelo and Stitt, Time and Vala, Jiri and Pachos, Jiannis K. (2008) Spectrum of the non-abelian phase in Kitaev’s honeycomb lattice model. Annals of Physics, 323 (9). pp. 2286-2310. ISSN 0003-4916

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Abstract

The spectral properties of Kitaev’s honeycomb lattice model are investigated both analytically and numerically with the focus on the non-abelian phase of the model. After summarizing the fermionization technique which maps spins into free Majorana fermions, we evaluate the spectrum of sparse vortex configurations and derive the interaction between two vortices as a function of their separation. We consider the effect vortices can have on the fermionic spectrum as well as on the phase transition between the abelian and non-abelian phases. We explicitly demonstrate the 2n-fold ground state degeneracy in the presence of 2n well separated vortices and the lifting of the degeneracy due to their short-range interactions. The calculations are performed on an infinite lattice. In addition to the analytic treatment, a numerical study of finite size systems is performed which is in exact agreement with the theoretical considerations. The general spectral properties of the non-abelian phase are considered for various finite toroidal systems.

Item Type:	Article
Keywords:	Topological models; Non-abelian vortices; Kitaev’s model;
Academic Unit:	Faculty of Science and Engineering > Mathematical Physics
Item ID:	10573
Identification Number:	https://doi.org/10.1016/j.aop.2007.12.009
Depositing User:	Dr. Jiri Vala
Date Deposited:	22 Feb 2019 17:34
Journal or Publication Title:	Annals of Physics
Publisher:	Elsevier
Refereed:	Yes
URI:	https://www.sciencedirect.com/
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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