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Originally published in Science Express on 31 July 2003
Science 22 August 2003:
Vol. 301. no. 5636, pp. 1074 - 1078
DOI: 10.1126/science.1086963
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Reports

Coherent Spin Transfer Between Molecularly Bridged Quantum Dots

Min Ouyang and David D. Awschalom*

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 ~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 may offer promising opportunities for future versatile molecule-based spintronic technologies.

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

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