“…For molecular systems, some * Electronic address: ochi@phys.sci.osaka-u.ac.jp; Present address: Department of Physics, Osaka University, Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan recent works have shown a high potentiality of the TC method [8,10,11]. Optimization of the wave function with a help of Monte Carlo integration [9,12,13] and development of the canonical TC theory [14] are also remarkable recent innovation. For solid-states calculations, the TC method is shown to reproduce accurate band structures [15][16][17] and optical absorption spectra [18].…”