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RISS 인기검색어
- 검색키워드
- 저자 : P. J. Klar (검색결과 2 건)
- 무료
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Energy Transfer and Dynamics of the Mn 3d5 Luminescence in Low Dimensional (Zn,Mn)S Nanostructures
W. Heimbrodt,L. Chen,T. Niebling,P. J. Klar,D. Stichtenoth,C. Ronning 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
ZnS:Mn nanostructures with different morphology, i.e. wires and belts, have been studied by time resolved photoluminescence. The temporal evolution of the internal Mn2+(3d5) luminescence is measured over 4 orders of magnitude in intensity. The decay behavior shows a clear dependence on the morphology of the nanostructure, in particular, on the ratio between the average Mn ion - killer center distance and the characteristic lateral size of the nanostructure. The non-exponential transients observed can be well described in the framework of a F¨orster-transfer at reduced dimensionality. We present an important step in resolving a longstanding controversy in the literature regarding the lifetime of the internal Mn2+ emission in ZnS nanoparticles.
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Optical and Magnetic Properties of MBE-Grown Manganese Sulfide Layers
W. Heimbrodt,L. Chen,H.-A. Krug Von Nidda,A. Loidl,P. J. Klar,L. David,K. A. Prior 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
Metastable zinc-blende MnS layers of various thicknesses from 1:8 nm to 8:6 nm have been grown by molecular beam epitaxy on (100) GaAs between ZnSe cladding layers. We studied the dependences of the optical and the magnetic properties on the layer thickness. On the one hand, the non-exponential decay of the Mn internal transition is found to be faster for thick erlayer,which is a size effect and not caused by the interfaces. On the other hand, the Neel-temperature is not altered with decreasing layer thickness, but the phase-transition-induced shift of the internal Mn transitions is smaller for thinnerMnSlayers. Thisisexplainedbythedominatingin uenceofMn ions at the interface, which possess a reduced number of Mn neighbors. SQUID measurements in a weak external magnetic eld conrm the optical observations in zero field. However, applying a strong magnetic field reveals the metamagnetic character of these zinc-blende MnS layers. An antiferromagnetic-to-erromagnetic phase transitionis found with increasing external field. Metastable zinc-blende MnS layers of various thicknesses from 1:8 nm to 8:6 nm have been grown by molecular beam epitaxy on (100) GaAs between ZnSe cladding layers. We studied the dependences of the optical and the magnetic properties on the layer thickness. On the one hand, the non-exponential decay of the Mn internal transition is found to be faster for thick erlayer,which is a size effect and not caused by the interfaces. On the other hand, the Neel-temperature is not altered with decreasing layer thickness, but the phase-transition-induced shift of the internal Mn transitions is smaller for thinnerMnSlayers. Thisisexplainedbythedominatingin uenceofMn ions at the interface, which possess a reduced number of Mn neighbors. SQUID measurements in a weak external magnetic eld conrm the optical observations in zero field. However, applying a strong magnetic field reveals the metamagnetic character of these zinc-blende MnS layers. An antiferromagnetic-to-erromagnetic phase transitionis found with increasing external field.
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