Speaker
Dr
Maksim Ulybyshev
(University of Würzburg)
Description
We report the results of Quantum Monte Carlo (QMC) simulations of graphene at large-scale lattices. In our study we accessed small enough temperatures and momenta to confirm the logarithmic divergence of the Fermi velocity at low energies in the non-perturbative regime. It appears that our QMC results lie in between predictions made by one-loop lattice perturbation theory (which substantially overestimates the effect) and Random Phase Approximation (RPA). We also probed the influence of short-range interactions on the long-range behavior of the Fermi velocity, by performing QMC calculations with the same long-range Coulomb tail but different cutoffs for the potentials at short distances.
Primary author
Dr
Maksim Ulybyshev
(University of Würzburg)
Co-authors
Dr
Savvas Zafeiropoulos
(University of Heidelberg, Germany)
Prof.
Fakher Assaad
(University of Würzburg, Germany)
