Many references exist in the density functional theory (DFT) literature to the chemical
potential of the electrons in an atom or a molecule. The origin of this notion has been the …

Solving the time-dependent quantum many-body Schrödinger equation is a challenging
task, especially for states at a finite temperature, where the environment affects the …

A vibrational electronic-thermofield coupled cluster (VE-TFCC) approach is developed to
calculate thermal properties of non-adiabatic vibronic coupling systems. The thermofield …

Single-reference methods such as Hartree–Fock-based coupled cluster theory are well
known for their accuracy and efficiency for weakly correlated systems. For strongly …

State-average calculations based on a mixture of states are increasingly being exploited
across chemistry and physics as versatile procedures for addressing excitations of quantum …

Eigenvectors of the reduced Bardeen–Cooper–Schrieffer Hamiltonian have recently been
employed as a variational wavefunction ansatz in quantum chemistry. This wavefunction is a …

Wave function methods have offered a robust, systematically improvable means to study
ground-state properties in quantum many-body systems. Theories like coupled cluster and …

Geminal wavefunctions have been employed to model strongly-correlated electrons. These
wavefunctions represent products of weakly-correlated pairs of electrons and reasonable …

A comprehensive and detailed account is presented for the finite-temperature many-body
perturbation theory for electrons that expands in power series all thermodynamic functions …

Recently, ground state eigenvectors of the reduced Bardeen–Cooper–Schrieffer (BCS)
Hamiltonian, Richardson–Gaudin (RG) states, have been employed as a wavefunction …