Publication in Physical Review B highlighted as Editor's Suggestion
Recent paper "Tunable exciton polaritons in biased bilayer graphene" supervised by POLIMA visitor André Chaves, with the participation of Pedro Ninhos, Christos Tserkezis, N. Asger Mortensen and Nuno Peres, was chosen as one of the best contributions to the February issue of Physical Review B.
The paper, which was initiated during André Chaves' stay at POLIMA, describes theoretically how electrically tunable exciton polaritons can
be realised in a microcavity. A twisted graphene bilayer is placed inside a standard mirror cavity, and the coupling between bilayer excitons
and cavity photons is described in both a semiclassical and a fully quantum picture, both showing that the strong-coupling regime can be
achieved. By gating the bilayer, it is possible to precisely tune its excitonic response, thus providing an in situ control of the emergence of
polaritons in the system. The paper also suggests that filling the cavity with an epsilon-near-zero material further enhances the coupling
capabilities, as it lowers the required cavity quality factor. The efficiency of excitons in twisted bilayers of 2D materials is thus demonstrated
for explorations and applications of polaritons in a wide range of energies.
be realised in a microcavity. A twisted graphene bilayer is placed inside a standard mirror cavity, and the coupling between bilayer excitons
and cavity photons is described in both a semiclassical and a fully quantum picture, both showing that the strong-coupling regime can be
achieved. By gating the bilayer, it is possible to precisely tune its excitonic response, thus providing an in situ control of the emergence of
polaritons in the system. The paper also suggests that filling the cavity with an epsilon-near-zero material further enhances the coupling
capabilities, as it lowers the required cavity quality factor. The efficiency of excitons in twisted bilayers of 2D materials is thus demonstrated
for explorations and applications of polaritons in a wide range of energies.