Electron spin coherence in Si

A. M. Tyryshkin, S. A. Lyon, T. Schenkel, J. Bokor, J. Chu, W. Jantsch, F. Schäffler, J. L. Truitt, S. N. Coppersmith, M. A. Eriksson

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

We discuss pulsed electron spin resonance measurements of electrons in Si and determine the spin coherence from the decay of the spin echo signals. Tightly bound donor electrons in isotopically enriched 28Si are found to have exceptionally long spin coherence. Placing the donors near a surface or interface is found to decrease the spin coherence time, but it is still in the range of milliseconds. Unbound two-dimensional electrons have shorter coherence times of a few microseconds, though still long compared to the Zeeman frequency or the typical time to manipulate a spin with microwave pulses. Longer spin coherence is expected in two-dimensional systems patterned into quantum dots, but relatively small dots will be required. Data from dots with a lithographic size of 400 nm do not yet show longer spin coherence.

Original languageEnglish (US)
Pages (from-to)257-263
Number of pages7
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume35
Issue number2
DOIs
StatePublished - Dec 1 2006

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

Keywords

  • Quantum computing
  • Spin coherence
  • Spin relaxation
  • Spin resonance

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