223 citations · 888 across the 34 of their papers we have counts for
10 papers · 1 filter
Fock space embedding theory for strongly correlated topological phases
Ryan Requist, E. K. U. Gross
A many-body wave function can be factorized in Fock space into a marginal amplitude describing a set of strongly correlated orbitals and a conditional amplitude for the remaining w…
Model Hamiltonian for strongly-correlated systems: Systematic, self-consistent, and unique construction
Ryan Requist, E. K. U. Gross
An interacting lattice model describing the subspace spanned by a set of strongly-correlated bands is rigorously coupled to density functional theory to enable ab initio calculatio…
Approximate formula for the macroscopic polarization including quantum fluctuations
Ryan Requist, E. K. U. Gross
The many-body Berry phase formula for the macroscopic polarization is approximated by a sum of natural orbital geometric phases with fractional occupation numbers accounting for th…
From density functional to Kondo: magnetic impurities in nanotubes
Pier Paolo Baruselli, M. Fabrizio, A. Smogunov +2
Low-temperature electronic conductance in nanocontacts, scanning tunneling microscopy (STM), and metal break junctions involving magnetic atoms or molecules is a growing area with…
Induced gauge potentials in reduced density matrix dynamics
Ryan Requist
The combination of interactions and nonadiabaticity in many body systems is shown to induce magnetic gauge potentials in the equation of motion for the one-body reduced density mat…
Ferromagnetic Kondo effect in a triple quantum dot system
Pier Paolo Baruselli, Ryan Requist, Michele Fabrizio +1
We propose that a simple device of three laterally-coupled quantum dots, the central one contacted by metal leads, can realize the ferromagnetic Kondo model, which is characterized…
Time-dependent occupation numbers in reduced-density-matrix functional theory: Application to an interacting Landau-Zener model
Ryan Requist, Oleg Pankratov
We prove that if the two-body terms in the equation of motion for the one-body reduced density matrix are approximated by ground-state functionals, the eigenvalues of the one-body…
Adiabatic approximation in time-dependent reduced-density-matrix functional theory
Ryan Requist, Oleg Pankratov
With the aim of describing real-time electron dynamics, we introduce an adiabatic approximation for the equation of motion of the one-body reduced-density matrix (one-matrix). The…
The Kohn-Sham system in one-matrix functional theory
Ryan Requist, Oleg Pankratov
A system of electrons in a local or nonlocal external potential can be studied with 1-matrix functional theory (1MFT), which is similar to density functional theory (DFT) but takes…
Quantum Electrical Dipole in Triangular Systems: a Model for Spontaneous Polarity in Metal Clusters
Philip B. Allen, Alexander G. Abanov, Ryan Requist
Triangular symmetric molecules with mirror symmetry perpendicular to the 3-fold axis are forbidden to have a fixed electrical dipole moment. However, if the ground state is orbital…