Antiferromagnetic order without recourse to staggered fields

Article

关键词: GROUND-STATE PROPERTIES;    LONG-RANGE ORDER;    SYMMETRY-BREAKING;    NEEL ORDER;    HEISENBERG ANTIFERROMAGNETS;    QUANTUM ANTIFERROMAGNETS;    TRIANGULAR LATTICE;    BROKEN SYMMETRY;    EXACT SPECTRA;    SPIN SYSTEMS;   

DOI  :  10.1103/PhysRevB.98.014416

来源: SCIE

【 摘 要 】

In the theory of antiferromagnetism, the staggered field-an external magnetic field that alternates in sign on atomic length scales-is used to select the classical Neel state from a quantum magnet but justification is missing. This work examines, within the decoherence framework, whether repeated local measurement can replace a staggered field. Accordingly, the conditions under which local decoherence can be considered a continuous measurement are studied. The dynamics of a small magnetic system is analyzed to illustrate that local decoherence can lead to (symmetry-broken) order similar to order resulting from a staggered field.

【 授权许可】

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