Nanowerk October 16, 2023
An international team of researchers (Australia, Spain) has introduced a novel approach ‘quantum virial expansion,’ to uncover the complex quantum interactions in two-dimensional semiconductors. They showed that this constituted a perturbatively exact theory in the high-temperature or low-doping regime, where the electrons’ thermal wavelength was smaller than their interparticle spacing. They obtained exact analytic expressions for the photoluminescence and predicted new features such as a nontrivial shape of the attractive branch peak related to universal resonant exciton-electron scattering and an associated energy shift from the trion energy. The theory allowed them to formally unify the two distinct theoretical pictures that have been applied to this system, where they revealed that the predictions of the conventional trion picture correspond to a high-temperature and weak-interaction limit of Fermi-polaron theory. According to the researchers their results agree with recent experiments… read more. TECHNICAL ARTICLE
Schematic illustration of the key features… Credit: Phys. Rev. Lett. 131, 106901, 6 September 2023