Benchmarking the simplest slave-particle theory with Hubbard dimer
Yang Wei-Wei1, Luo Hong-Gang1, 2, Zhong Yin1, †
       

The heat capacity Cv in non-half-filled situation: exact diagonalization (full red line), the Z 2 slave-spin MF method (green circle), the slave-spin method with GC (blue triangle), and also the slave-spin method without GC (yellow diamond). The results are calculated with different U.