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physics.comp-ph2024
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…
physics.comp-ph2023
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…