The research group focuses on the theoretical description of quantum many-body systems, with particular emphasis on light-matter interactions and emergent quasiparticles in driven and equilibrium settings. The group investigates phenomena such as exciton-polaritons, Fermi and Bose polarons, and mediated interactions, combining analytical methods with advanced numerical techniques. A central goal is to understand how strong correlations and non-equilibrium dynamics give rise to novel collective behavior in low-dimensional systems, including moiré materials and coupled cavity platforms. Through close collaboration with experimental groups, the research aims to provide predictive frameworks and physically models that can guide and interpret cutting-edge experiments in quantum fluids of light and solid-state systems.

Iliana graduated with honors ( "Mención Honorífica" ) and her article on the dynamics of intercavity polaritons and condensation in Physical Review A.
Congratulations, Iliana

Our work on room-temperature polariton condensate gets published in ACS Photonics! We demonstrated the key hallmarks of exciton-polariton condensation at room temperature in self-assembled perovskite microcavities, including nonlinear threshold behavior, spectral narrowing, macroscopic spatial coherence, and the spontaneous formation of quantized vortices.

In a collaboration with the theoretical groups of Prof. Víctor Romero-Rochín and Rosario Paredes IFUNAM, together with our experimental collegues from Heidelberg-Bonn, Prof. Martin Weitz, Julian Schmitt, Leon Kleebank and Frank Vewinger we have studied the critical behaviour of ideal BECs from a thermodynamic perspective.

Iliana’s bachelor’s project has been accepted in Physical Review A: Coupled cavities can lead to hybrid light–matter collective modes with their matter and light components spatially separated. This work was carried out in collaboration with the Quantum Fluids of Light Group at IFUNAM.

Grover's first PhD results have appeared on arXiv. The damping rate of moving charged polarons reveals the intrinsic nature of the ion–atom interaction and exhibits a power-law asymptotic behavior for fast impurities.

Enrique's and Genaro's bachelor's research results are now available on arXiv. In collaboration with Prof. Ardila, we studied how non-local interactions modify the many-body spectrum of impurities in a two-dimensional lattice. We find a rich polaronic structure, including unconventional quasiparticle branches and spectroscopically dark impurity states.

In Physical Review Applied: Strong coupling beyond the high-Q limit and linewidth narrowing in multi-exciton microcavities has been observed by the groups of Prof E. Cerda an P. Santos. Theory in collaboration with Prof. Yura Ruba. 

The group of J. Arlt has reported the observation of low-lying impurity states in a BEC. The theory in collaboration with groups of Prof.  G. Bruun and K. Nielsen

Moroni's third article appears as a Letter in J. Phys: Condensed Matter. 

The groups of Profs. J. Schmitt, M. Weitz, and F. Vewinger demonstrated the critical exponents of an ideal Bose–Einstein condensate. This work was supported by theoretical input from our colleagues at IFUNAM, R. Paredes and V. Romero-Rochín.

Our review on moiré excitons and exciton–polaritons has been published, in collaboration with Prof. D. Ruiz-Tijerina and the Quantum Fluids of Light Group at IFUNAM, led by Dr. Saúl Herrera.