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A. R. Pereira

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Preprint Oct 2026

A rigid commensurate host and a defect that switches: vacancies in the frustrated alternating spin-(1, 1/2) Heisenberg chain

The alternating spin-$(1,\tfrac12)$ Heisenberg chain with a frustrating next-nearest-neighbor coupling $J_2$ loses its Lieb--Mattis moment through a discontinuous transition to a singlet whose nature was left open. Using an SU(2)-symmetric density-matrix renormalization group, in which the total spin is a quantum-numbe...

R. C. Silva, R. C. Silva, A. R. Pereira · 0 citations

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