Observation of the quantum confined ground state in InP quantum dots at 300 K

作者： H. Giessen , B. Fluegel , G. Mohs , N. Peyghambarian , J. R. Sprague

关键词: Quantum dot 、 Molecular physics 、 Chemistry 、 Condensed matter physics 、 Ground state 、 Femtochemistry 、 Electronic structure 、 Colloid 、 Absorption spectroscopy 、 Quantum

摘要: Colloidal suspensions of InP quantum dots (diameters 25 and 35 A) show steplike absorption spectra which are blue‐shifted by about 1 eV with respect to bulk material. Time resolved femtosecond spectroscopy at room temperature identifies the first confined state. The nonlinear bleaching signal rises within 300 fs persists longer than 200 ps.