irbasis: Open-source database and software for intermediate-representation basis functions of imaginary-time Green's function

Naoya Chikano, Kazuyoshi Yoshimi, Junya Otsuki, Hiroshi Shinaoka

Research output: Contribution to journalArticlepeer-review

Abstract

The open-source library, irbasis, provides easy-to-use tools for two sets of orthogonal functions named intermediate representation (IR). The IR basis enables a compact representation of the Matsubara Green's function and efficient calculations of quantum models. The IR basis functions are defined as the solution of an integral equation whose analytical solution is not available for this moment. The library consists of a database of pre-computed high-precision numerical solutions and computational code for evaluating the functions from the database. This paper describes technical details and demonstrates how to use the library.

Original languageEnglish
JournalUnknown Journal
Publication statusPublished - Jul 13 2018

Keywords

  • Imaginary-time Green's function
  • Many-body quantum theories
  • Matsubara

ASJC Scopus subject areas

  • General

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