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Coherent Precession of an Individual 5/2 Spin
M Goryca1, M Koperski1, P Wojnar2
1Institute of Experimental Physics, University of Warsaw, ul. Hoża 69, 00-681 Warszawa, Poland.
Physical Review Letters
|December 11, 2014
Summary
We observed coherent spin precession in a single manganese ion (Mn2+) within a cadmium telluride quantum dot. This reveals complex spin dynamics and potential for strain sensing applications.
Area of Science:
- Quantum dots
- Spintronics
- Solid-state physics
Background:
- Individual magnetic ions in quantum dots offer unique spintronic properties.
- Understanding large-spin dynamics is crucial for quantum information processing.
Purpose of the Study:
- To directly observe and characterize the coherent spin precession of a single Mn2+ ion.
- To investigate the influence of magnetic fields and crystal strain on spin dynamics.
Main Methods:
- Time-resolved pump-probe absorption spectroscopy on a single CdTe quantum dot.
- Utilizing a magnetic field to probe spin precession.
Main Results:
- Direct observation of coherent spin precession for an individual Mn2+ ion (spin 5/2).
- Revealed nonsinusoidal state occupation evolution and beatings due to strain-induced energy level differences.
- Demonstrated sensitivity of large-spin impurity to crystal strain.
Conclusions:
- The study provides direct insight into large-spin coherent dynamics in quantum dots.
- The Mn2+ ion in CdTe quantum dots can serve as a sensitive local probe for crystal strain.
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