Takuto Yamada   Takafumi Suzuki   Sei-ichiro Suga   
PHYSICA B-CONDENSED MATTER 525 91-93 2017年11月 [査読有り]
We investigate ground state energies and low-energy excitations of the S = 1/2 Kitaev-Heisenberg model on honeycomb lattices by using dimer series expansions. We find that dimer series expansions can approach the close vicinity of the Kitaev limit...