New Convenient Way for Deriving Exponential Operators' Disentangling Formulas and Their Applications
Fan Hong-Yi, Liyun Hu · Communications in Theoretical Physics · 2009
We recommend a new convenient method for disentangling some exponential operators and derive a set of new operator identities. Especially, we derive the normal odering form of exp [fa † a + ga †2 + ka 2 ] without appealing to Lie algebra method. Application of these formulas in solving some dynamic Hamiltonian is presented.