148 citations · 668 across the 22 of their papers we have counts for
10 papers · 1 filter
Spin-constrained Hartree-Fock and the generator coordinate method for the 2-site Hubbard model
Stijn De Baerdemacker, Amir Ayati, Hugh G. A. Burton +3
We present a mathematical analysis of the spin-constrained Hartree-Fock solutions (CHF) of the 2-site Hubbard model. The analysis sheds light on the spin symmetry breaking process…
Spin polarization through Floquet resonances in a driven central spin model
Pieter W. Claeys, Stijn De Baerdemacker, Omar El Araby +1
Adiabatically varying the driving frequency of a periodically-driven many-body quantum system can induce controlled transitions between resonant eigenstates of the time-averaged Ha…
A variational method for integrability-breaking Richardson-Gaudin models
Pieter W. Claeys, Jean-Sébastien Caux, Dimitri Van Neck +1
We present a variational method for approximating the ground state of spin models close to (Richardson-Gaudin) integrability. This is done by variationally optimizing eigenstates o…
Block product density matrix embedding theory for strongly correlated spin systems
Klaas Gunst, Sebastian Wouters, Stijn De Baerdemacker +1
Density matrix embedding theory (DMET) is a relatively new technique for the calculation of strongly correlated systems. Recently, block product DMET (BPDMET) was introduced for th…
Read-Green resonances in a topological superconductor coupled to a bath
Pieter W. Claeys, Stijn De Baerdemacker, Dimitri Van Neck
We study a topological superconductor capable of exchanging particles with an environment. This additional interaction breaks particle-number symmetry and can be modelled by means…
Projected seniority-two orbital optimization of the Antisymmetric Product of one-reference orbital Geminal
Katharina Boguslawski, Paweł Tecmer, Peter A. Limacher +5
We present a new, non-variational orbital-optimization scheme for the Antisymmetric Product of one-reference orbital Geminal wave function. Our approach is motivated by the observa…