Existence of an Intermediate Metallic Phase at the SDW-CDW Crossover Region in the One-Dimensional Holstein-Hubbard Model at Half-Filling

Figure 3

Phase diagram in (𝛼,𝑈) plane determined by the peaks in 𝑑𝑡_eff/𝑑𝑈. The curve corresponding to 𝑈_eff=0 is also given by the dotted curve.