Staggered dimer order in S=1/2 quantum spin ladder system with four spin exchange

Details Staggered dimer order in S=1/2 quantum spin ladder system with four spin exchange Staggered dimer order in S=1/2 quantum spin ladder system with four spin exchange

2003-03-19

arxiv.org/abs/cond-mat/0303379v1

Physical Review B. 68, 134403 (2003)

Physics

Condensed Matter

Statistical Mechanics

Submitted to Phys. Rev. B, (REVTeX4)

Scientific paper

10.1103/PhysRevB.68.134403

We study the S=1/2 quantum spin ladder system with the four-spin exchange, using density matrix renormalization group method and an exact diagonalization method. Recently, the phase transition in this system and its universality class are studied. But there remain controversies whether the phase transition is second order type or the other type and the nature of order parameter. There are arguments that the massless phase appears. But this does not agree with our previous result. Analyzing DMRG data, we try a new approach in order to determine a phase which appears after the phase transition. We find that the edge state appears in the open boundary condition, investigating excitation energies of states with higher magnetizations.

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