Competition between dimerization and vector chirality in the spin- - Heisenberg chain with uniaxial single-ion anisotropy
arXiv:2408.11394 · doi:10.1103/PhysRevB.110.195129
Abstract
The spin- chain is a versatile prototypical platform for the study of competition between different kinds of magnetic orders, with the objective of obtaining a deeper understanding of the corresponding quantum phase transitions. In this work, we investigate the spin- chain with nearest-neighbor , next-nearest-neighbor , and uniaxial single-ion anisotropy terms in the absence of a magnetic field. For positive values of and , we find seven different phases in a rich phase diagram. Without frustration , a gapless Luttinger liquid phase remains stable for all . As increases, we observe three phases with distinct dimerized valence bond orders, which show an intricate competition with vector chiral order and incommensurate correlations. For large , regions of phase coexistence between the dimerized and vector chiral orders emerge. We present large-scale numerical data for the determination of transition lines, order parameters, and the nature of the phase transitions.
8 pages, 10 figures
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