Interactions not contained in the original Hamiltonian are generated by this unitary transformation. With an average field approximation, we can close the flow equations.
由于在幺正变换下产生了新的高阶相互作用项，利用平均场近似手段得到了系统参数随流参数变化的流方程。
Interactions not contained in the original Hamiltonian are generated by this unitary transformation. With an average field approximation, we can close the flow equations.
由于在幺正变换下产生了新的高阶相互作用项，利用平均场近似手段得到了系统参数随流参数变化的流方程。
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