Field theoretical study of a spin-1/2 ladder with unequal chain exchanges

Sarkar, S.; Sen, D.

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Field theoretical study of a spin-1/2 ladder with unequal chain exchanges

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Sarkar, S.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Sarkar, S., & Sen, D. (2002). Field theoretical study of a spin-1/2 ladder with unequal chain exchanges. Physical Review B, 65: 1722408. Retrieved from http://ojps.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRBMDO000065000017172408000001&idtype=cvips&gifs=yes.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002B-38C1-6

Abstract

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