53 citations · 297 across the 28 of their papers we have counts for
7 papers · 1 filter
Renormalization of States and Quasiparticles in Many-body Downfolding
Annabelle Canestraight, Zhen Huang, Vojtech Vlcek
We explore the principles of many-body Hamiltonian complexity reduction via downfolding on an effective low-dimensional representation. We present a unique measure of fidelity betw…
Efficient Quasiparticle Determination beyond the Diagonal Approximation via Random Compression
Annabelle Canestraight, Xiaohe Lei, Khaled Ibrahim +1
Calculations of excited states in Green's function formalism often invoke the diagonal approximation, in which the quasiparticle states are taken from a mean-field calculation. Her…
On the unimportance of memory for the time non-local components of the Kadanoff-Baym equations
Cian C. Reeves, Yuanran Zhu, Chao Yang +1
The generalized Kadanoff-Baym ansatz (GKBA) is an approximation to the Kadanoff-Baym equations (KBE), that neglects certain memory effects that contribute to the Green's function a…
Dynamic Mode Decomposition for Extrapolating Non-equilibrium Green's Functions Dynamics
Cian C. Reeves, Jia Yin, Yuanran Zhu +3
The HF-GKBA offers an approximate numerical procedure for propagating the two-time non-equilibrium Green's function(NEGF). Here we compare the HF-GKBA to exact results for a variet…
Stochastic many-body calculations of moiré states in twisted bilayer graphene at high pressures
Mariya Romanova, Vojtech Vlcek
Atomistic first principles many-body computational studies were so far limited by the system size. In this work, we apply and expand the stochastic GW method allowing calculations…
Decomposition and embedding in the stochastic self-energy
Mariya Romanova, Vojtěch Vlček
We present two new developments for computing excited state energies within the approximation. First, calculations of the Green's function and the screened Coulomb interaction…
Stochastic Time-Dependent DFT with Optimally Tuned Range-Separated Hybrids: Application to Excitonic Effects in Large Phosphorene Sheets
Vojtech Vlcek, Roi Baer, Daniel Neuhauser
We develop a stochastic approach to time-dependent DFT with optimally-tuned range-separated hybrids containing non-local exchange, for calculating optical spectra. The attractive e…