RESUMEN
In Diabetes Mellitus the loss of capacity to regulate immunity, the reduction of pulmonary functions and the pro-thrombotic state determine the severity of COVID-19.
Asunto(s)
Betacoronavirus , Infecciones por Coronavirus/complicaciones , Infecciones por Coronavirus/fisiopatología , Complicaciones de la Diabetes/fisiopatología , Neumonía Viral/complicaciones , Neumonía Viral/fisiopatología , COVID-19 , Infecciones por Coronavirus/inmunología , Complicaciones de la Diabetes/inmunología , Diabetes Mellitus/inmunología , Diabetes Mellitus/fisiopatología , Coagulación Intravascular Diseminada/etiología , Coagulación Intravascular Diseminada/inmunología , Coagulación Intravascular Diseminada/fisiopatología , Humanos , Modelos Biológicos , Neuroinmunomodulación , Pandemias , Neumonía Viral/inmunología , Síndrome de Dificultad Respiratoria/etiología , Síndrome de Dificultad Respiratoria/inmunología , Síndrome de Dificultad Respiratoria/fisiopatología , Factores de Riesgo , SARS-CoV-2 , Trombosis/etiología , Trombosis/inmunología , Trombosis/fisiopatologíaRESUMEN
We have investigated plasmonic excitations at the surface of Bi_{2}Se_{3}(0001) via high-resolution electron energy loss spectroscopy. For low parallel momentum transfer q_{â¥}, the loss spectrum shows a distinctive feature peaked at 104 meV. This mode varies weakly with q_{â¥}. The behavior of its intensity as a function of primary energy and scattering angle indicates that it is a surface plasmon. At larger momenta (q_{â¥}~0.04 Å^{-1}), an additional peak, attributed to the Dirac plasmon, becomes clearly defined in the loss spectrum. Momentum-resolved loss spectra provide evidence of the mutual interaction between the surface plasmon and the Dirac plasmon of Bi_{2}Se_{3}. The proposed theoretical model accounting for the coexistence of three-dimensional doping electrons and two-dimensional Dirac fermions accurately represents the experimental observations. The results reveal novel routes for engineering plasmonic devices based on topological insulators.