Zobrazeno 1 - 10
of 345
pro vyhledávání: '"Kaye, Jason P."'
We present an automatic, high-order accurate, and adaptive Brillouin zone integration algorithm for the calculation of the optical conductivity with a non-zero but small broadening factor $\eta$, focusing on the case in which a Hamiltonian in a downf
Externí odkaz:
http://arxiv.org/abs/2406.15466
Autor:
Kiese, Dominik, Strand, Hugo U. R., Chen, Kun, Wentzell, Nils, Parcollet, Olivier, Kaye, Jason
We present a generalization of the discrete Lehmann representation (DLR) to three-point correlation and vertex functions in imaginary time and Matsubara frequency. The representation takes the form of a linear combination of judiciously chosen expone
Externí odkaz:
http://arxiv.org/abs/2405.06716
We introduce cppdlr, a C++ library implementing the discrete Lehmann representation (DLR) of functions in imaginary time and Matsubara frequency, such as Green's functions and self-energies. The DLR is based on a low-rank approximation of the analyti
Externí odkaz:
http://arxiv.org/abs/2404.02334
We show that the amplitude mode in superconductors exhibits chirped oscillations under resonant excitation and that the chirping velocity increases as we approach the critical excitation strength. The chirped amplitude mode enables us to determine th
Externí odkaz:
http://arxiv.org/abs/2403.01589
We propose a simple and efficient method to calculate the electronic self-energy in dynamical mean-field theory (DMFT), addressing a numerical instability often encountered when solving the Dyson equation. Our approach formulates the Dyson equation a
Externí odkaz:
http://arxiv.org/abs/2310.01266
Publikováno v:
Phys. Rev. X 14, 031034 (2024)
We present a deterministic algorithm for the efficient evaluation of imaginary time diagrams based on the recently introduced discrete Lehmann representation (DLR) of imaginary time Green's functions. In addition to the efficient discretization of di
Externí odkaz:
http://arxiv.org/abs/2307.08566
Autor:
Sheng, Nan, Hampel, Alexander, Beck, Sophie, Parcollet, Olivier, Wentzell, Nils, Kaye, Jason, Chen, Kun
Several recent works have introduced highly compact representations of single-particle Green's functions in the imaginary time and Matsubara frequency domains, as well as efficient interpolation grids used to recover the representations. In particula
Externí odkaz:
http://arxiv.org/abs/2301.07764
Publikováno v:
SciPost Phys. 15, 062 (2023)
We present efficient methods for Brillouin zone integration with a non-zero but possibly very small broadening factor $\eta$, focusing on cases in which downfolded Hamiltonians can be evaluated efficiently using Wannier interpolation. We describe rob
Externí odkaz:
http://arxiv.org/abs/2211.12959
We present an efficient method for propagating the time-dependent Kohn-Sham equations in free space, based on the recently introduced Fourier contour deformation (FCD) approach. For potentials which are constant outside a bounded domain, FCD yields a
Externí odkaz:
http://arxiv.org/abs/2209.11027
Autor:
Nunez-Fernandez, Yuriel, Jeannin, Matthieu, Dumitrescu, Philipp T., Kloss, Thomas, Kaye, Jason, Parcollet, Olivier, Waintal, Xavier
Publikováno v:
Phys. Rev. X 12, 041018 (2022)
We use tensor network techniques to obtain high order perturbative diagrammatic expansions for the quantum many-body problem at very high precision. The approach is based on a tensor train parsimonious representation of the sum of all Feynman diagram
Externí odkaz:
http://arxiv.org/abs/2207.06135