Coupling of quantum states in a single CdSe/ZnSe quantum dot molecule

Xiong, Hongwei; Chen, Z.H.; Hyomi, K.; Souma, I.; Zhang, Y.N.; Sun, Liaoxin; Ren, Qijun; Bai, Lihui; Huang, Shaohua; Wang, F.Z.; Murayama, Akihiro; Oka, Y.; Shen, S. C.

doi:10.1016/j.jlumin.2005.12.062

Cited by 4 publications

(2 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In comparison with organic fluorephores, quantum dots (QDs) have unique optical and electronic properties, such as narrow and symmetrical fluorescence peak, tunable emission wavelength according to their size and material composition, very high levels of brightness and photostability, which is making them very suitable in this area [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

CdTe QDs-based prostate-specific antigen probe for human prostate cancer cell imaging

Dong

Guo

Wang

et al. 2009

Journal of Luminescence

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

CdTe QDs-based prostate-specific antigen probe for human prostate cancer cell imaging

Dong

Guo

Wang

et al. 2009

Journal of Luminescence

View full text Add to dashboard Cite

“…QDs have been intensively investigated in bio-probe applications [8] due to their advantages such as tunable size-dependent emission with high photoluminescence quantum yields (QYs), broad excitation spectra and narrow emission bandwidths. In particular, ligand-protected QDs such as CdSe have been increasingly explored as analytical tools in many biological fields since the seminar works from Alivisatos and coworkers [9] and Chan and Nie [10].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of CdSe/CdS with a simple non-TOP-based route

Yang

Chen

2007

Journal of Luminescence

View full text Add to dashboard Cite

Dynamics of exciton-spin injection, transfer, and relaxation in self-assembled quantum dots of CdSe coupled with a diluted magnetic semiconductor layer ofZn0.80Mn0.20Se

et al. 2007

Self Cite

View full text Add to dashboard Cite

We study the dynamics of exciton-spin injection, transfer, and relaxation in self-assembled quantum dots ͑QDs͒ of CdSe coupled with a diluted magnetic semiconductor ͑DMS͒ layer of Zn 0.80 Mn 0.20 Se, where spinpolarized excitons can be injected from the DMS into the QDs. The degree of circular polarization P of excitonic photoluminescence ͑PL͒ at 5 T in the coupled QDs exhibits a rapid increase with increasing delay time, up to +0.3 at 25 ps after the pulse excitation of the DMS by a linearly polarized light. This development of a positive P value directly reflects the spin-injection dynamics from the DMS, since the intrinsic polarization of the QD excitons due to Zeeman splitting is P ϳ −0.1 when only the QDs are selectively excited. The P value gradually decays with time after reaching its maximum, as a result of the exciton-spin relaxation with a time constant of 800 ps in the QDs. Time-resolved circularly polarized PL spectra immediately after the pulse excitation directly show the exciton-energy dependence of the spin-injection dynamics in the QD ensemble, where two-dimensional-like QDs with higher exciton energies show higher receptivity to the spin-polarized excitons than three-dimensional-like dots with lower exciton energies. A rate equation analysis reveals all time constants responsible for the spin-injection dynamics. We deduce a time constant of 10 ps for the spin injection. The spin-injection efficiency of 0.94 is also obtained, which corresponds to the ratio between the number of the spin-polarized excitons responsible for the rise of the positive P value in the QD emission and the total number of the excitons injected from the DMS. Moreover, we observe that interdot exciton transfer significantly affects the P value within the QD emission band after the fast spin injection, in addition to the spin relaxation within the QDs.

show abstract

Coupling of quantum states in a single CdSe/ZnSe quantum dot molecule

Cited by 4 publications

References 20 publications

CdTe QDs-based prostate-specific antigen probe for human prostate cancer cell imaging

CdTe QDs-based prostate-specific antigen probe for human prostate cancer cell imaging

Synthesis of CdSe/CdS with a simple non-TOP-based route

Dynamics of exciton-spin injection, transfer, and relaxation in self-assembled quantum dots of CdSe coupled with a diluted magnetic semiconductor layer ofZn0.80Mn0.20Se

Contact Info

Product

Resources

About