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Published Online July 31, 2003
Science DOI: 10.1126/science.1086963

Reports

Submitted on May 19, 2003
Accepted on July 3, 2003

Coherent Spin Transfer Between Molecularly Bridged Quantum Dots

Min Ouyang 1 David D. Awschalom 1*

1 Department of Physics and Center for Spintronics and Quantum Computing, University of California, Santa Barbara, CA 93106, USA.

* To whom correspondence should be addressed. E-mail: awsch{at}physics.ucsb.edu.

Femtosecond time-resolved Faraday rotation spectroscopy reveals the instantaneous transfer of spin coherence through conjugated molecular bridges spanning quantum dots of different size over a broad range of temperature. The room temperature spin transfer efficiency is approximately 20%, showing that conjugated molecules can be used not only as interconnections for the hierarchical assembly of functional networks but also as efficient spin channels. The results suggest that this class of structures may be useful as two-spin quantum devices operating at ambient temperatures and offer promising opportunities for future versatile molecule-based spintronic technologies.


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Science. ISSN 0036-8075 (print), 1095-9203 (online)