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中国物理学会期刊

一种具有次近邻相互作用的Transverse XY模型

CSTR: 32037.14.aps.38.645

A TRANSVERSE XY MODEL WITH NEXT NEAREST NEIGHBOUR INTERACTIONS

CSTR: 32037.14.aps.38.645
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  • 本文推广Transverse XY模型量子链至次近邻相互作用情况,考虑哈密顿量 H=g∑nσn2-∑n ((1+γ)/2σnxσn+1x+(1-γ)/2σnyσn+1y)-λ∑n ((1+β)/2σnxσn+2x+(1-β)/2σnyσn+2y)。当β=0以及γ≠0时,证明在临界点附近它对应于一自由费密场,从而属伊辛普适类。

     

    We generalize the transverse XY model to the case with NNN interactions. The Hamiltonian is H=g∑nσn2-∑n ((1+γ)/2σnxσn+1x+(1-γ)/2σnyσn+1y)-λ∑n ((1+β)/2σnxσn+2x+(1-β)/2σnyσn+2y). It is shown that the model with β=0 and γ≠0 isequivalent to the free fermion field in the vicinity of critical point, so that it belongs to the Ising universality class.

     

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