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          Institute: MPI für Physik Komplexer Systeme     Collection: Phase transitions and critical phenomena     Display Documents



ID: 478839.0, MPI für Physik Komplexer Systeme / Phase transitions and critical phenomena
Field theoretical study of a spin-1/2 ladder with unequal chain exchanges
Authors:Sarkar, S.; Sen, D.
Language:English
Date of Publication (YYYY-MM-DD):2002
Title of Journal:Physical Review B
Volume:65
Sequence Number of Article:1722408
Review Status:not specified
Audience:Not Specified
Abstract / Description: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 -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. ©2002 The American Physical Society
External Publication Status:published
Document Type:Article
Communicated by:Heidrun Näther
Affiliations:MPI für Physik Komplexer Systeme/Visitors Program
Identifiers:URL:http://ojps.aip.org/getabs/servlet/GetabsServlet?p...
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