Picosecond Dynamics of Excitonic Magnetic Polarons in Colloidal Diffusion-Doped Cd1–xMnxSe Quantum Dots

ACS Nano ◽  
2015 ◽  
Vol 9 (11) ◽  
pp. 11177-11191 ◽  
Author(s):  
Heidi D. Nelson ◽  
Liam R. Bradshaw ◽  
Charles J. Barrows ◽  
Vladimir A. Vlaskin ◽  
Daniel R. Gamelin
Keyword(s):  
Quantum Dots ◽  
Magnetic Polarons ◽  
Colloidal Diffusion

scholarly journals Robust magnetic polarons in type-II (Zn,Mn)Te/ZnSe magnetic quantum dots

2010 ◽  
Vol 82 (19) ◽  
Author(s):  
I. R. Sellers ◽  
R. Oszwałdowski ◽  
V. R. Whiteside ◽  
M. Eginligil ◽  
A. Petrou ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Type Ii ◽  
Magnetic Polarons ◽  
Magnetic Quantum Dots

Optically Controlled Nanomagnets

2009 ◽  
Vol 1208 ◽  
Author(s):  
Sebastian Mackowski ◽  
Tak Gurung ◽  
Grzegorz Karczewski ◽  
Howard E Jackson ◽  
Leigh Smith
Keyword(s):  
Quantum Dots ◽  
Laser Light ◽  
Local Magnetic Field ◽  
Circularly Polarized ◽  
Magnetic Polarons ◽  
Doped Quantum Dots ◽  
Light Excitation ◽  
Imaging And Spectroscopy ◽  
Mn Concentration ◽  
Magnetically Doped

AbstractWe report on single dot photoluminescence imaging and spectroscopy at B=0T on magnetically doped CdMnTe self-assembled quantum dots with average Mn concentration of several percent. Quasi-resonant excitation with circularly polarized laser leads to formation of magnetic polarons with magnetization induced by the laser light. In this case all quantum dots are polarized in the same direction. In contrast, when the dots are populated using above the barrier excitation, with randomly polarized excitons, the resultant magnetization is random and varies from dot to dot. These experiments demonstrate a way to control the magnetization of magnetically doped quantum dots by means of light excitation. In addition, they point towards extremely long spin memory times in these structures, reaching hundreds of microseconds, making CdMnTe quantum dots promising candidates for local magnetic field sources on the nanoscale.

scholarly journals Reentrant formation of magnetic polarons in quantum dots

2012 ◽  
Vol 86 (16) ◽  
Author(s):  
J. M. Pientka ◽  
R. Oszwałdowski ◽  
A. G. Petukhov ◽  
J. E. Han ◽  
Igor Žutić
Keyword(s):  
Quantum Dots ◽  
Magnetic Polarons

Optically controlled magnetization of zero-dimensional magnetic polarons in CdMnTe self-assembled quantum dots

2004 ◽  
Vol 241 (3) ◽  
pp. 656-659 ◽  
Author(s):  
S. Mackowski ◽  
T. Gurung ◽  
T. A. Nguyen ◽  
H. E. Jackson ◽  
L. M. Smith ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Magnetic Polarons ◽  
Self Assembled

Conventional versus unconventional magnetic polarons: ZnMnTe/ZnSe and ZnTe/ZnMnSe quantum dots

2014 ◽  
Author(s):  
B. Barman ◽  
Y. Tsai ◽  
T. Scrace ◽  
J. R. Murphy ◽  
A. N. Cartwright ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Magnetic Polarons

Nanostructure of semiconductor quantum dots in a borosilicate glass matrix by complementary use of HREM and AEM

1990 ◽  
Vol 48 (4) ◽  
pp. 728-729
Author(s):  
M.J. Kim ◽  
L.C. Liu ◽  
S.H. Risbud ◽  
R.W. Carpenter
Keyword(s):  
Quantum Dots ◽  
Borosilicate Glass ◽  
Glass Matrix ◽  
Optical Switching ◽  
Response Times ◽  
Fast Response ◽  
Processing Technique ◽  
Internal Stresses ◽  
Electron Hole ◽  
Spatial Dimensions

When the size of a semiconductor is reduced by an appropriate materials processing technique to a dimension less than about twice the radius of an exciton in the bulk crystal, the band like structure of the semiconductor gives way to discrete molecular orbital electronic states. Clusters of semiconductors in a size regime lower than 2R {where R is the exciton Bohr radius; e.g. 3 nm for CdS and 7.3 nm for CdTe) are called Quantum Dots (QD) because they confine optically excited electron- hole pairs (excitons) in all three spatial dimensions. Structures based on QD are of great interest because of fast response times and non-linearity in optical switching applications.In this paper we report the first HREM analysis of the size and structure of CdTe and CdS QD formed by precipitation from a modified borosilicate glass matrix. The glass melts were quenched by pouring on brass plates, and then annealed to relieve internal stresses. QD precipitate particles were formed during subsequent "striking" heat treatments above the glass crystallization temperature, which was determined by differential thermal analysis.

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