Benchmark of correlation matrix renormalization method in molecule calculations
作者：Han Zhang, Wen-Cai Lu, Yong-Xin Yao, Cai-Zhuang Wang and Kai-Ming Ho
關(guān)鍵字：correlation matrix renormalization method
論文來(lái)源：期刊
具體來(lái)源：Journal of Physics: Condensed Matter
發(fā)表時(shí)間：2019年
We report benchmark calculations of the correlation matrix renormalization (CMR) approach for 23 molecules in the well-established G2 molecule set. This subset represents molecules with spin-singlet ground state in a variety of chemical bonding and coordination environments. The QUAsi-atomic Minimal Basis-set Orbitals (QUAMBOs) are used as local orbitals in both CMR and full configuration interaction (FCI) calculations for comparison. The results obtained from the calculations are also compared with available experimental data. It is shown that the CMR method produces binding and dissociation energy curves in good agreement with the QUAMBO-FCI calculations as well as experimental results. The CMR benchmark calculations yield a standard deviation of 0.09 ? for the equilibrium bond length and 0.018 Hartree/atom for the formation energy, with a gain of great computational efficiency which scales like Hartree-Fock method.