Abstract
The effect of the four-spin cyclic exchange interaction at eachplaquette in the S = 1/2 two-leg spin ladder is investigated atT = 0, focusing especially on the field-induced gap. Thestrong-rung-coupling approximation suggests that it yields a plateauat half of the saturation moment (m = 1/2) in the magnetizationcurve, which corresponds to a field-induced spin gap with aspontaneous breaking of the translational symmetry. A precise phasediagram at m = 1/2 is also presented, based on the levelspectroscopy analysis of the numerical data obtained by the Lanczosmethod. The boundary between the gapless and plateau phases isconfirmed to be of the Kosterlitz-Thouless (KT) universality class.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
