7 papers
Low-Scaling Many-Body Green's Function Calculations for Molecular Systems via Interacting-Bath Dynamical Embedding Theory
Christian Venturella, Jiachen Li, Tianyu Zhu
We present a molecular extension of our recently proposed Green's function embedding method, interacting-bath dynamical embedding theory (ibDET), for computing charged excitation e…
Resolving Finite-Size Errors in EOM-CCSD Band Gaps of Solids with Interacting-Bath Dynamical Embedding Theory
Jiachen Li, Christopher Hillenbrand, Christian Venturella +2
Periodic equation-of-motion coupled-cluster theory with single and double excitations (EOM-CCSD) has shown promise for quantitative calculations of band structures in solids. Howev…
Derivative Discontinuity in Many-Body Perturbation Theory and Chemical Potentials in Random Phase Approximation
Jiachen Li, Weitao Yang
We derive analytical expressions for chemical potentials within the random phase approximation (RPA), equivalently the energy functional evaluated using non interacting Green'…
LibppRPA: An Open-Source Library for Particle-Particle Random Phase Approximation
Jincheng Yu, Jiachen Li, Chaoqun Zhang +2
The accurate description of electron correlation and excitation energies remains a fundamental challenge in quantum chemistry. The particle-particle random phase approximation (ppR…
Unified Deep Learning Framework for Many-Body Quantum Chemistry via Green's Functions
Christian Venturella, Jiachen Li, Christopher Hillenbrand +3
Quantum many-body methods provide a systematic route to computing electronic properties of molecules and materials, but high computational costs restrict their use in large-scale a…
Energy-Specific Bethe-Salpeter Equation Implementation for Efficient Optical Spectrum Calculations
Christopher Hillenbrand, Jiachen Li, Tianyu Zhu
We present an energy-specific Bethe-Salpeter equation (BSE) implementation for efficient core and valence optical spectrum calculations. In energy-specific BSE, high-lying excitati…