The impurity Green's function Gf in the local non-Fermi liquid state is evaluated by means of the continuous-time quantum Monte Carlo method extended to the multichannel Anderson model. For N = M (where N and M are numbers of spin components and channels, respectively), Gf is expressed as-ImGf (ω + i0) = c - b|ω|1/2, and the zero-frequency value c depends only on N (= M). A corresponding impurity self-energy at low frequencies is composed of two parts: a resonance term related to c, and a non-Fermi liquid term proportional to |ω| 1/2. The characteristic energy scale is discussed in terms of the non-Fermi liquid term in the self-energy.
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