2017-09-152017-08-10ALVES, Eyber Domingos. Dinâmica populacional em sistemas atômicos de dois e três níveis de energia. 2017. 70 f. Dissertação (Mestrado em Física) - Universidade Federal de Goiás, Goiânia, 2017.http://repositorio.bc.ufg.br/tede/handle/tede/7736In this work a description of the interaction between electromagnetic radiation and matter will be made. Two and three-level atomic systems will be addressed, which in turn is in the (Lambda) configuration.We will use the Dicke states to calculate the transition probability between the energetic levels for a 2-level ensemble of atoms interacting with a circularly polarized field. We will deduce the master equation for a two-level atom interacting with a thermal reservoir, observing the effects of irreversible spontaneous decay and loss of coherence between quantum states. Finally, we will study the phenomenon of Electromagnetically Induced Transparency (EIT) and Dark states.application/pdfAcesso Abertohttp://creativecommons.org/licenses/by-nc-nd/4.0/Estados escurosEITEquação mestraEstados de DickeDark statesMaster equationDicke statesFISICA::FISICA GERALDissertação