44 citations · 46 across the 3 of their papers we have counts for
4 papers
Hyperfunction formulation of many body Green's functions and the Matsubara formalism
Roman Smit
We show that the single-particle Green's functions used in many body theory have an elegant description in the form of hyperfunctions. We summarize the necessary hyperfunction conc…
Quantum discontinuity fixed point and renormalization group flow of the SYK model
Roman Smit, Davide Valentinis, Jörg Schmalian +1
We determine the global renormalization group (RG) flow of the Sachdev-Ye-Kitaev (SYK) model. This flow allows for an understanding of the surprising role of critical slowing down…
Heat capacity of anisotropic Heisenberg antiferromagnet within the spin Hartree-Fock approach in quasi-1D Regime
R. Smit, P. Kopietz, O. Tsyplyatyev
We study the anisotropic quantum Heisenberg antiferromagnet for spin-1/2 that interpolates smoothly between the one-dimensional (1D) and the two-dimensional (2D) limits. Using the…
Magnon damping in the zigzag phase of the Kitaev-Heisenberg- model on a honeycomb lattice
R. L. Smit, S. Keupert, O. Tsyplyatyev +3
We calculate magnon dispersions and damping in the Kitaev-Heisenberg model with an off-diagonal exchange and isotropic third-nearest-neighbor interaction on a honeycomb l…