Spin incoherence of donor electrons near c-Si(111)/SiO2 interface defects

ORAL

Abstract

Electron and nuclear spins of phosphorous ($^{31}$P) donors in crystalline silicon have been investigated extensively in recent years as they both have extremely long quantum mechanical coherence times which makes them extremely interesting candidates for quantum information and spin-electronics applications [1]. Existing silicon quantum computer concepts [2] propose to use $^{31}$P qubits close to the silicon surface. We present here a study of how microscopic defects at the oxide layer of the silicon surface influence the spin coherence times (T$_{1}$ and T$_{2}$ times) of the $^{31}$P qubits. Using pulsed electrically detected magnetic resonance spectroscopy [3], we show that due to the interaction of the $^{31}$P qubits with the interface states, the previously known, extremely long bulk coherence times are drastically shortened [4]. \\[4pt] [1] J. J. L.Morton, et al., Nature \textbf{455}, 1085 (2008). \\[0pt] [2] B. E. Kane, Nature 393, 133 (1998). \\[0pt] [3] A. R. Stegner, et al., \textit{Nature Physics} 2, 835 (2006). \\[0pt] [4] S.-Y. Paik, et al., arXiv:cond-mat/0905.0416 (2009).

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Authors

  • Seoyoung Paik

    Department of Physics and Astronomy, University of Utah

  • Sang -Yun Lee

    Department of Physics and Astronomy, University of Utah, USA, Department of Physics and Astronomy, University of Utah

  • John Poate

    Brigham Young University, Los Alamos National Laboratory, Department of Physics and Astronomy, University of Utah, USA, MV Systems, Inc., USA, Helmholtz-Zentrum Berlin fuer Materialien und Energie, Abteilung Silizium-Photovoltaik, Germany, Colorado School of Mines, Department of Physics, USA, Georgia Institute of Technology, Arizona State University, Physics Department of Babolsar University, Iran, Physics Department, New Mexico State University, Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ, 85287-1604, USA, Department of Electrical Engineering, University of Arkansas, Fayetteville, AR 72701, USA, Department of Physics, Arizona State University, Tempe, AZ, 85287-1504, USA, Colorado State University, University of Wisconsin, NSF ERC for Extreme Ultraviolet Science and Technology, Colorado State University, BYU-Provo, Michigan Technical University and Pierre Auger Collaboration, University of Colorado, Colorado School of Mines, Department of Physics, Colorado State University, Department of Physics, Cornell University, NASA, University of Massachusetts at Amherst, University of Massachusetss at Amherst, APS President, Harvard University, Society of Physics Students, Duke University, Computer Science, Brigham Young University, Chemistry \& Biochemistry, Brigham Young University, University of Arizona, University of Utah, Kansas State Univ., Bethel University, University of New Mexico, Stanford University, JILA, University of Colorado at Boulder, NIST, JILA, University of Colorado at Boulder, National Renewable Energy Laboratory, University of Denver, University of Colorado, Boulder, NREL, Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ, 85287- 1604, USA, DU, ERI, Eleanor Roosevelt Institute (ERI), Cerro Tololo Interamerican Observatory, Utah State University, Center for Atmospheric and Space Sciences, Sciprint.org, University of Colorado at Boulder, JILA and University of Colorado, Kirchhoff Institute for Physics, University of Heidelberg, Utah Valley University, University of New South Wales, San Francisco State University, Weber State University, Cambridge University, Department of Physics and Astronomy, University of Utah, Kansas State University, Columbia University, NY, University of Colorado/JILA, Vice-President for Research and Technology Transfer, Colorado School of Mines

  • Dane R. McCamey

    Department of Physics and Astronomy, University of Utah

  • Christoph Boehme

    University of Utah, Department of Physics and Astronomy, University of Utah