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This study identifies a novel critical line in transverse-field Ising chains where competing magnetic anisotropies generate vector chiral order without the finite-size drift typical of standard models. The discovery of quadratic low-energy excitations along this gapless line offers improved precision for mapping complex quantum phase transitions and dynamical behaviors. Such findings advance the theoretical understanding of unconventional magnetism and the interplay between anisotropy and external fields in isolated quantum systems.

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Foshan University Team Finds New Phases in Quantum Magnetism

Quantum ZeitgeistOctober 3, 20263 min read

Competition between magnetic anisotropies within an Ising chain has revealed a previously unobserved critical line exhibiting behaviour markedly different to standard models. Unlike conventional scenarios, this newly identified point displays no finite-size drift, offering improved precision for understanding complex systems. This discovery suggests unconventional magnetism can arise through competing interactions beyond established theoretical frameworks.

A transverse-field Ising chain featuring dimerised anisotropic Γ interactions has been investigated. Competition between Γ anisotropy and the transverse field exists both without and with Ising interactions. The study analyses vector chiral order alongside dynamical quantum phase transitions within this specific system. Theoretical modelling of the described Ising chain observes these phenomena. Dimerisation impacts the interplay between anisotropy and external…

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