Shastry, Sriram B and Sen, Diptiman (1997) Majorana fermion representation for an antiferromagnetic spin-1/2 chain. In: Physical Review B, 55 (5). pp. 2988-2994.
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We study the one-dimensional Heisenberg antiferromagnet with s = 1/2 using a Majorana representation of the s = 1/2 spins. A simple Hartree-Fock approximation of the resulting model gives a bilinear fermionic description of the model. This description is rotationally invariant and gives power-law correlations in the ‘‘ground state’’ in a natural fashion. The excitations are a two-parameter family of particles, which are spin- 1 objects. These are contrasted to the ‘‘spinon’’ spectrum, and the technical aspects of the representation are discussed, including the problem of redundant states.
|Item Type:||Journal Article|
|Additional Information:||Copyright of this article belongs to American Physical Society.|
|Department/Centre:||Division of Physical & Mathematical Sciences > Centre for Theoretical Studies
Division of Physical & Mathematical Sciences > Physics
|Date Deposited:||16 Mar 2007|
|Last Modified:||19 Sep 2010 04:35|
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