Sarkar, S and Sen, D (2002) Field theoretical study of a spin-1/2 ladder with unequal chain exchanges. In: Physical Review, 65 (172408).
phy_rev.pdf - Published Version
We study the low-energy properties of a Heisenberg spin-1/2 zigzag ladder with different exchange constants on the two chains. Using a nonlinear sigma-model field theory and Abelian bosonization, we find that the excitations are gapless, with a finite spin-wave velocity, if the values of the chain exchanges are small. If the chain exchanges are large, the system is gapped, and the energy spectra of the kink and antikink excitations are different from each other.
|Item Type:||Journal Article|
|Additional Information:||Copyright of this article belongs to Elsevier Science.|
|Department/Centre:||Division of Physical & Mathematical Sciences > Centre for Theoretical Studies|
|Date Deposited:||21 Jul 2009 10:46|
|Last Modified:||19 Sep 2010 05:02|
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