Spin-1 chain with spin-½ excitations in the bulk

Sen, Diptiman ; Surendran, Naveen (2007) Spin-1 chain with spin-½ excitations in the bulk Physical Review B: Condensed Matter and Materials Physics, 75 (10). 104411_1-104411_7. ISSN 1098-0121

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Official URL: http://prb.aps.org/abstract/PRB/v75/i10/e104411

Related URL: http://dx.doi.org/10.1103/PhysRevB.75.104411

Abstract

We present a spin-1 chain with a Hamiltonian which has three exactly solvable ground states. Two of these are fully dimerized, analogous to the Majumdar-Ghosh (MG) states of a spin-½ chain, while the third is of the Affleck-Kennedy-Lieb-Tasaki (AKLT) type. We use variational and numerical methods to study the low-energy excitations which interpolate between these ground states in different ways. In particular, there is a spin-½ excitation which interpolates between the MG and AKLT ground states; this is the lowest excitation of the system and it has a surprisingly small gap. We discuss generalizations of our model of spin fractionalization to higher spin chains and higher dimensions.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:45550
Deposited On:28 Jun 2011 05:44
Last Modified:18 May 2016 01:47

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