Robust analytic continuation combining the advantages of the sparse modeling approach and Padé approximation
Yuichi Motoyama,
Kazuyoshi Yoshimi,
Junya Otsuki
Abstract:Analytic continuation (AC) from the imaginary-time Green's function to the spectral function is a crucial process for numerical studies of the dynamical properties of quantum many-body systems. This process, however, is an ill-posed problem; that is, the obtained spectrum is unstable against the noise of the Green's function. Though several numerical methods have been developed, each of them has its own advantages and disadvantages. The sparse modeling (SpM) AC method, for example, is robust against the noise … Show more
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