Qin, Jingbo; Jie, Quanlin; Fan, Zhuo - In: The European Physical Journal B - Condensed Matter and … 87 (2014) 12, pp. 1-8
We present an efficient implementation of the hierarchical mean-field theory with large block in quantum spin systems. The wave function is a product of the large block states. Each large block state is a superposition of products of small block states. Our result is very close to that of the...