Transverse-field Ising model
= Transverse-field Ising model
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The transverse-field Ising model is a quantum spin model with competing Ising exchange and a perpendicular field, for example $H=-J\sum_iX_iX_{i+1}-h\sum_iZ_i$. In one dimension its ordered and paramagnetic phases meet at $|h/J|=1$.