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TT: Fachverband Tiefe Temperaturen
TT 4: Graphene, 2D and Twisted Materials
TT 4.12: Vortrag
Montag, 9. März 2026, 12:30–12:45, HSZ/0105
Polaritonic near-field effects on the metal-to-insulator transition of the Hubbard model — •Paul Fadler1, Marios Michael2, Katharina Lenk3, Michael Sentef1, and Martin Eckstein3 — 1Institute for Theoretical Physics, University of Bremen — 2Max-Planck-Institut für Physik komplexer Systeme, Dresden — 3Department of Physics, University of Hamburg
The influence of the dielectric environment on material properties has been studied theoretically mostly within two different contexts:
Within Coulomb engineering one uses electrostatic screening of the longitudinal electromagnetic field to renormalize interactions [1].
In contrast, within cavity material engineering one tries to shape the transverse electromagnetic field to produce desired material properties [2].
For certain settings, such as in the near-field of materials hosting phonon- or plasmon-polaritons, this separation is no longer possible as the longitudinal and transverse components of the electromagnetic field mix.
We investigate the resulting effect on the metal-to-insulator phase transition of a 2-D Hubbard model suspended above a polariton-hosting material using DMFT + GW treating the longitudinal and transverse fields consistently.
Lastly, we consider the gauge dependence introduced by our scheme for the Coulomb [3] and Weyl gauge [4].
[1] E. van Loon et al., npj 2D Mater. Appl. 7, 47 (2023)
[2] F. Schlawin et al., Appl. Phys. Rev. 9, 011312 (2022)
[3] K. Lenk et al., Phys. Rev. B 106, 245124 (2022)
[4] C. Eckhardt et al., Phys. Rev. Lett. 135, 156902 (2025)
Keywords: Mott transition; Hubbard model; Dynamical mean field theory; GW