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您的检索式：作者名="FENEBERG Martin"
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| 1 | Growth-induced Stacking Faults of ZnO Nanorods Probed by Spatial Resolved Cathodoluminescence显示文摘Low density ZnO nanorods are grown by modified chemical vapor deposition on silicon substrates using gold as a catalyst.We use high resolution photoiuminescence spectroscopy to gain the optical properties of these nanorods in large scale.The as-grown samples show sharp near-band-gap luminescence with a full width at half maximum of bound exciton peaks at about 300μeV,and the ratio of ultraviolet/yellow luminescence larger than 100.Highly spatial and spectral resolved scanning electron microscope-cathodoluminescence is performed to excite the ZnO nanorods in single rods or different positions of single rods with the vapour-solid grovth mechanism.The bottom of the nanorod has a 3.31-eV luminescence,which indicates that basal plane stacking faults are related to the defects that are created at the first stage of growth due to the misfit between ZnO and Si. | 谢涌 介万奇 王涛 WIEDENMANN Michael NEUSCHL Benjamin MADEL Manfred 王亚彬 FENEBERG Martin THONKE Klaus | 2012 | Chinese Physics Letters2012，29，7： | 0 |
| 2 | Delocalization of dark and bright excitons in flat-band materials and the optical properties of V_(2)O_(5)显示文摘The simplest picture of excitons in materials with atomic-like localization of electrons is that of Frenkel excitons,where electrons and holes stay close together,which is associated with a large binding energy.Here,using the example of the layered oxide V_(2)O_(5),we show how localized charge-transfer excitations combine to form excitons that also have a huge binding energy but,at the same time,a large electron-hole distance,and we explain this seemingly contradictory finding.The anisotropy of the exciton delocalization is determined by the local anisotropy of the structure,whereas the exciton extends orthogonally to the chains formed by the crystal structure.Moreover,we show that the bright exciton goes together with a dark exciton of even larger binding energy and more pronounced anisotropy.These findings are obtained by combining first principles many-body perturbation theory calculations,ellipsometry experiments,and tight binding modelling,leading to very good agreement and a consistent picture.Our explanation is general and can be extended to other materials. | Vitaly Gorelov Lucia Reining Martin Feneberg Rüdiger Goldhahn AndréSchleife Walter R.L.Lambrecht Matteo Gatti | 2022 | npj Computational Materials2022，，1： | 0 |
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