Compressing Green's function using intermediate representation between imaginary-time and real-frequency domains
Year: 2017
Type: article
Abstract: Model-independent compact representations of imaginary-time data are presented in terms of the intermediate representation (IR) of analytical continuation. We demonstrate the efficiency of the IR through continuous-time quantum Monte Carlo calculations of an Anderson impurity model. We find that the IR yields a significantly compact form of various types of correlation functions. This allows the direct quantum Monte Carlo measurement of Green's functions in a compressed form, which considerably reduces the computational cost and memory usage. Furthermore, the present framework will provide general ways to boost the power of cutting-edge diagrammatic/quantum Monte Carlo treatments of many-body systems.
Institutions: Saitama University, Tohoku University, The University of Tokyo
Language: English
Topic: Quantum many-body systems
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: Construction of a unified theory for magnetism and superconductivity in strongly correlated electron systems, G3692789091, Innovative machine learning algorithm driven by violation of detailed balance condition, G520793423, G626432754, G7455115559, New era driven by quantum annealing for machine learning and computation, Fusion of Control/Quantum/Information Theories for Quantum Control Technology, First-principle studies of superlattice systems of 5d pyrochlores
OpenAlex ID: W2606574146