Anisotropy-Induced Spin Parity Effects
arxiv(2024)
摘要
Spin parity effects refer to those special situations where a dichotomy in
the physical behavior of a system arises, solely depending on whether the
relevant spin quantum number is integral or half-odd integral. As is the case
with the Haldane conjecture in antiferromagnetic spin chains, their pursuit
often derives deep insights and invokes new developments in quantum condensed
matter physics. Here we put forth a simple and general scheme for generating
such effects in any spatial dimension through the use of anisotropic
interactions, and a setup within reasonable reach of state-of-the-art cold-atom
implementations. We demonstrate its utility through a detailed analysis of the
magnetization behavior of a specific one-dimensional spin chain model – an
anisotropic antiferromagnet in a transverse magnetic field, unraveling along
the way the quantum origin of finite-size effects observed in the magnetization
curve that had previously been noted but not clearly understood.
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