244 citations · 1.4k across the 40 of their papers we have counts for
40 papers
Emergent BEC mechanism in flat-band superconductors
V. Berger, I. S. Tupitsyn, B. Currie +3
The formation of bound bosonic pairs of fermions, followed by their Bose-Einstein (quasi) condensation (BEC), is a foundational mechanism of superconductivity. At low filling, flat…
Avoided Stoner instability at a single ordinary Van Hove point
I. S. Tupitsyn, B. Currie, A. V. Chubukov +3
When the Fermi surface and the Brillouin zone boundary touch at a Van Hove point, mean-field analysis predicts a ferromagnetic (Stoner) instability at finite for any coupl…
Numerically Exact Study of Flat-Band Superconductivity
I. S. Tupitsyn, B. Currie, B. V. Svistunov +2
Current theories of high-temperature superconductivity in flat-band systems predict a linear dependence of the transition temperature on the attractive interaction, …
Strange diffusivity of incoherent metal in half-filled two-dimensional Hubbard model
Youngmin Eom, Igor S. Tupitsyn, Nikolay V. Prokof'ev +3
We study charge transport across the metal-insulator crossover in the half-filled two-dimensional Hubbard model, with particular emphasis on precision control. The dynamic current-…
Dielectric losses in metals
I. S. Tupitsyn, N. V. Prokof'ev
Bethe-Salpeter equation (BSE) in the self-consistent Hartree-Fock (HF) basis is often used for describing complex many-body effects in material science applications. Its exact solu…
Interaction-enhanced nesting in Spin-Fermion and Fermi-Hubbard models
R. Rossi, F. Simkovic, M. Ferrero +4
The spin-fermion (SF) model postulates that the dominant coupling between low-energy fermions in near critical metals is mediated by collective spin fluctuations (paramagnons) peak…