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

The heat capacity Cv in half-filled situation: exact diagonalization (full red line), the Z 2 slave-spin MF method (full green line), and the slave-spin method with GC (blue triangle). The results are calculated with different U.