A TRANSVERSE XY MODEL WITH NEXT NEAREST NEIGHBOUR INTERACTIONS

XU BO-WEI; TANG KUN-FA

doi:10.7498/aps.38.645

Abstract
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.
Authors and contacts
XU BO-WEI,

TANG KUN-FA

1.
上海交通大学物理系
References

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Vol. 38, Issue 4 - 1989-02-20

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