37 citations · 177 across the 20 of their papers we have counts for
8 papers · 1 filter
Electrically tunable and enhanced nonlinearity of moiré exciton-polaritons in transition metal dichalcogenide bilayers
Kok Wee Song, Oleksandr Kyriienko
We develop a microscopic theory for nonlinear optical response of moiré exciton-polaritons in bilayers of transition metal dichalcogenides (TMDs). Our theory allows to study the tu…
Nonlinear Rydberg exciton-polaritons in CuO microcavities
Maxim Makhonin, Anthonin Delphan, Kok Wee Song +13
Rydberg excitons (analogues of Rydberg atoms in condensed matter systems) are highly excited bound electron-hole states with large Bohr radii. The interaction between them as well…
Interlayer superexchange in bilayer chromium trihalides
Kok Wee Song
We construct a microscopic model based on superexchange theory for a moiré bilayer in chromium trihalides (Cr, Br, I). In particular, we derive analytically the interlayer…
Microscopic theory of nonlinear phase space filling in polaritonic lattices
Kok Wee Song, Salvatore Chiavazzo, Oleksandr Kyriienko
We develop a full microscopic theory for a nonlinear phase space filling (NPSF) in strongly coupled two-dimensional polaritonic lattices. Ubiquitous in polaritonic experiments, the…
Theory for Coulomb scattering of trions in 2D materials
Kok Wee Song, Salvatore Chiavazzo, Ivan A. Shelykh +1
We develop a theoretical description of Coulomb interactions between trions (charged excitons) that define a nonlinear optical response in doped two-dimensional semiconductors. Fir…
Attractive trion-polariton nonlinearity due to Coulomb scattering
Kok Wee Song, Salvatore Chiavazzo, Ivan A. Shelykh +1
We theoretically investigate the nonlinearity of trion-polaritons in a two-dimensional material that arises from Coulomb interaction between quasiparticles. To evaluate the interac…
Crossover from weakly indirect to direct excitons in atomically thin films of InSe
Adrián Ceferino, Kok Wee Song, Samuel J. Magorrian +2
We perform a theory analysis of the spectra of the lowest energy and excited states of the excitons in few-layer atomically thin films of InSe taking into acco…
Excitonic Instabilities and Insulating States in Bilayer Graphene
Kok Wee Song, Yung-Ching Liang, Stephan Haas
The competing ground states of bilayer graphene are studied by applying renormalization group techniques to a bilayer honeycomb lattice with nearest neighbor hopping. In the absenc…