Journal
NANO LETTERS
Volume 16, Issue 2, Pages 1081-1085Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b04217
Keywords
Crystal phase quantum dot; nanowire; InP; two-photon cascaded emission; type II transition
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Funding
- European Research Council under the European Union's Seventh Framework Programme/ERC Grant [307687]
- NanoNextNL of the Government of The Netherlands
- Polish Ministry of Science and Higher Education [IP 2012064572]
- Villum Fonden [00007368] Funding Source: researchfish
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We report the first comprehensive experimental and theoretical study of the optical properties of single crystal phase quantum dots in InP nanowires. Crystal phase quantum dots are defined by a transition in the crystallographic lattice between zinc blende and wurtzite segments and therefore offer unprecedented potential to be controlled with atomic layer accuracy without random alloying. We show for the first time that crystal phase quantum dots are a source of pure single-photons and cascaded photon-pairs from type II transitions with excellent optical properties in terms of intensity and line width. We notice that the emission spectra consist often of two peaks close in energy, which we explain with a comprehensive theory showing that the symmetry of the system plays a crucial role for the hole levels forming hybridized orbitals. Our results state that crystal phase quantum dots have promising quantum optical properties for single photon application and quantum optics.
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