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Phys. Rev. Lett. 101, 047601 (2008) [4 pages]

Quenching Spin Decoherence in Diamond through Spin Bath Polarization

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Susumu Takahashi1,*, Ronald Hanson2,3, Johan van Tol4, Mark S. Sherwin1, and David D. Awschalom3
1Department of Physics and Center for Terahertz Science and Technology, University of California, Santa Barbara, California 93106, USA
2Kavli Institute of Nanoscience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands
3Department of Physics and Center for Spintronics and Quantum Computation, University of California, Santa Barbara, California 93106, USA
4National High Magnetic Field Laboratory, Florida State University, Tallahassee Florida 32310, USA

Received 8 April 2008; published 23 July 2008

See accompanying Physics Synopsis

We experimentally demonstrate that the decoherence of a spin by a spin bath can be completely eliminated by fully polarizing the spin bath. We use electron paramagnetic resonance at 240 GHz and 8 T to study the electron-spin coherence time T2 of nitrogen-vacancy centers and nitrogen impurities in diamond from room temperature down to 1.3 K. A sharp increase of T2 is observed below the Zeeman energy (11.5 K). The data are well described by a suppression of the flip-flop induced spin bath fluctuations due to thermal electron-spin polarization. T2 saturates at ∼250  μs below 2 K, where the polarization of the electron-spin bath exceeds 99%.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.047601
DOI:
10.1103/PhysRevLett.101.047601
PACS:
76.30.Mi, 03.65.Yz

*susumu@iqcd.ucsb.edu

 
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