2014/06/20 by Naotomo Takemura, Stéphane Trebaol, Michiel Wouters +4 · 1 citation
Physics and Astronomy · #Atomic physics #Biexciton #Bound state #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Exciton #Feshbach resonance #Molecule #Physics #Polariton #Quantum and electron transport phenomena #Quantum mechanics #Resonance (particle physics) #Strong Light-Matter Interactions #cond-mat.mes-hall
paper · pdf · doi:10.1038/nphys2999
published as Nature Physics 10, 500 (2014) · supplementary material included. available at http://www.nature.com/nphys/journal/v10/n7/full/nphys2999.html
openalex publication_date 2014/06/20 · arxiv created 2014/08/08 · arxiv updated 2015/04/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
A Feshbach resonance occurs when the energy of two interacting free particles comes to resonance with a molecular bound state. When approaching this resonance, dramatic changes in the interaction strength between the particles occur. Feshbach resonances have been an essential tool to control the atom interactions, which can even be switched from repulsive to attractive [1-4]. Thanks to Feshbach resonances many effects in ultracold atomic gases could be explored [5, 6]. Here we demonstrate a Feshbach resonance based on polariton spinor interactions that characterize the fundamental interaction process in polariton quantum systems. We show the clear enhancement of attractive interactions and the prompt change to repulsive interaction by tuning the energy of two polaritons with anti-parallel spins across the biexciton bound state energy. A mean field two-channel model quantitatively reproduces the experimental results. This observation paves the way for a new tool to tune the polariton interactions and to move forward into quantum correlated polariton physics.