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Dynamical transition from triplets to spinon excitations: A series expansion study of theJ1−J2−δspin-12chain
1999
Physical Review B (Condensed Matter)
We study the spin-half Heisenberg chain with alternating nearest neighbor interactions J_1(1+δ) and J_1(1-δ) and a uniform second neighbor interaction J_2=y (1-δ) by series expansions around the limit of decoupled dimers (δ=1). By extrapolating to δ=0 and tuning y, we study the critical point separating the power-law and spontaneously dimerized phases of the spin-half antiferromagnet. We then focus on the disorder line y=0.5, 0<δ< 1, where the ground states are known exactly. We calculate the
doi:10.1103/physrevb.59.9911
fatcat:4c7jifby3fci5l2ci6vfocyvai