Effect of quantum confinement on the dielectric function of PbSe

2020-02-15 11:42:48

function dielectric dependent confinement PbSe

责任者: Hens, Z.;Vanmaekelbergh, D.;Kooij, E.S.;Wormeester, H.;Allan, G.;Delerue, C. 单位: Debye Inst., Utrecht Univ., Netherlands 来源出处: Physical Review Letters(Phys. Rev. Lett. (USA)),2004/01/16,92(2):026808-1 摘要: Monolayers of lead selenide nanocrystals of a few nanometers in height have been made by electrodeposition on a Au(111) substrate. These layers show a thickness-dependent dielectric function, which was determined using spectroscopic ellipsometry. The experimental results are compared with electronic structure calculations of the imaginary part of the dielectric function of PbSe nanocrystals. We demonstrate that the size-dependent variation of the dielectric function is affected by quantum confinement at well-identifiable points in the Brillouin zone, different from the position of the band-gap transition 关键词: Brillouin zones;dielectric function;electrodeposits;ellipsometry;energy gap;IV-VI semiconductors;lead compounds;monolayers;nanostructured materials;tunnelling spectra;thickness-dependent dielectric function;quantum confinement;nanocrystal monolayers;electrodeposition;spectroscopic ellipsometry;electronic structure calculations;imaginary dielectric function;Brillouin zone;band-gap transition;Lorentz oscillators;resonant tunneling spectroscopy;low-dimensional semiconductors;PbSe