Room-temperature spin coherence in zinc blende CdSe quantum dots studied by time-resolved Faraday ellipticity

AbstractWe use a time-resolved technique with three laser pulses (pump, orientation and probe) to study the photocharging dynamics with picosecond resolution on a long timescale ranging from ps to ms in CdS colloidal quantum dots. The detection is based on measuring the coherent spin dynamics of electrons, allowing us to distinguish the type of carrier in the dot core (electron or hole). We find that although initially negative photocharging happens because of fast hole trapping on surface states, eventually it evolves to positive photocharging due to electron trapping and hole detrapping. The positive photocharging lasts up to hundreds of microseconds at room temperature.

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Photooxidation and Photobleaching of Single CdSe/ZnS Quantum Dots Probed by Room-Temperature Time-Resolved Spectroscopy

The Journal of Physical Chemistry B ◽

10.1021/jp012018h ◽

2001 ◽

Vol 105 (35) ◽

pp. 8281-8284 ◽

Cited By ~ 290

Author(s):

Wilfried G. J. H. M. van Sark ◽

Patrick L. T. M. Frederix ◽

Dave J. Van den Heuvel ◽

Hans C. Gerritsen ◽

Ageeth A. Bol ◽

...

Keyword(s):

Quantum Dots ◽

Room Temperature ◽

Time Resolved ◽

Time Resolved Spectroscopy ◽

Temperature Time

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Erratum: “Narrow luminescence lines from self-assembled CdSe quantum dots at room temperature” [Appl. Phys. Lett. 78, 297 (2001)]

Applied Physics Letters ◽

10.1063/1.1377866 ◽

2001 ◽

Vol 78 (23) ◽

pp. 3749-3749

Author(s):

Z. H. Zheng ◽

K. Okamoto ◽

H. C. Ko ◽

Y. Kawakami ◽

Sg. Fujita

Keyword(s):

Quantum Dots ◽

Room Temperature ◽

Cdse Quantum Dots ◽

Self Assembled

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Room-Temperature Organic Negative Differential Resistance Device Using CdSe Quantum Dots as the ITO Modification Layer

Chinese Physics Letters ◽

10.1088/0256-307x/32/11/117301 ◽

2015 ◽

Vol 32 (11) ◽

pp. 117301 ◽

Cited By ~ 1

Author(s):

Bo Jiao ◽

Li-Juan Yao ◽

Chun-Fang Wu ◽

Hua Dong ◽

Xun Hou ◽

...

Keyword(s):

Quantum Dots ◽

Negative Differential Resistance ◽

Room Temperature ◽

Differential Resistance ◽

Cdse Quantum Dots

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Spin relaxation in zinc blende and wurtzite CdSe quantum dots

Chemical Physics Letters ◽

10.1016/j.cplett.2010.03.081 ◽

2010 ◽

Vol 491 (4-6) ◽

pp. 187-192 ◽

Cited By ~ 20

Author(s):

Vanessa M. Huxter ◽

Jeongho Kim ◽

Shun S. Lo ◽

Anna Lee ◽

P. Sreekumari Nair ◽

...

Keyword(s):

Quantum Dots ◽

Spin Relaxation ◽

Cdse Quantum Dots ◽

Zinc Blende

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Hot injection versus room temperature synthesis of CdSe quantum dots: A differential spectroscopic and bioanalyte sensing efficacy evaluation

Colloids and Surfaces A Physicochemical and Engineering Aspects ◽

10.1016/j.colsurfa.2016.01.002 ◽

2016 ◽

Vol 494 ◽

pp. 162-169 ◽

Cited By ~ 21

Author(s):

Irshad Ahmed Mir ◽

Kishan Das ◽

Kamla Rawat ◽

H.B. Bohidar

Keyword(s):

Quantum Dots ◽

Room Temperature ◽

Cdse Quantum Dots ◽

Efficacy Evaluation ◽

Temperature Synthesis ◽

Room Temperature Synthesis ◽

Hot Injection

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ELECTRON SPIN COHERENCE IN SINGLY CHARGED QUANTUM DOTS

International Journal of Modern Physics B ◽

10.1142/s0217979209062396 ◽

2009 ◽

Vol 23 (12n13) ◽

pp. 2813-2825

Author(s):

D. R. YAKOVLEV ◽

A. GREILICH ◽

M. BAYER ◽

I. A. YUGOVA

Keyword(s):

Quantum Dots ◽

Electron Spin ◽

Zeeman Splitting ◽

Mode Locking ◽

Spin Coherence ◽

Time Resolved ◽

Pump Probe ◽

Spin Dephasing ◽

Rotation Technique ◽

Singly Charged

Electron spin coherence is examined experimentally and theoretically in singly charged ( In , Ga ) As / GaAs quantum dots. Time-resolved pump-probe Faraday rotation technique is used to examine fine structure and Zeeman splitting of excitons and resident electrons. Spin dephasing and spin coherence times of resident electrons have been measured in the regime of mode-locking of spin coherency.

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