Readout schemes for phosphorous donor electron and nuclei in silicon

Phosphorous exists only as a single isotope 31P with a nuclear spin I=1/2. Built as donor impurity into a crystalline silicon host environment, it forms a localized single electron donor state. Both the 31P nucleus and the donor electron have extremely long coherence times which is why they have been proposed as spin quantum information carriers (qubits) but also as classical bits for spin memory and spin electronic applications.

Our work is concerned with the investigation of electrical single electron or nuclear spin measurement concepts as the implementation of the so far hypothetical 31P based spin technologies will require reliable microscopic readout procedures for individual spins in order to the retrieve spin information stored in the 31P spin memory.

Sketches of (a) the band diagram and (b) the geometry of gate controlled 31P readout devices.

Plot of the electrical current change along the interface of a 31P doped monocrystalline silicon sample to a silicon dioxide layer as a function of time and magnetic field after a coherent very short microwave excitation at t=0.

Our recent results on this topic:

D. R. McCamey*, J. van Tol, G. W. Morley, and C. Boehme* Electronic Spin Storage in an Electrically Readable Nuclear Spin Memory with a Lifetime >100 Seconds
Science 330, 1652 (2010).

S.-Y. Paik, S.-Y. Lee, W. J. Baker, D. R. McCamey*,  and C. Boehme* T1- and T2-spin relaxation time limitations of phosphorous donor electrons near crystalline silicon to silicon dioxide interface defects
Phys. Rev. B 81, 075214 (2010). also on arXiv:cond-mat/0905.0416.

G. W. Morley*, D. R. McCamey, H. A. Seipel, L.-C. Brunel, J. van Tol, C. Boehme*

Long spin coherence in silicon with an electrical spin trap readout
Phys. Rev. Lett. 101, 207602 (2008),
also on arXiv:cond-mat/0806.3431 (2008).

A. R. Stegner*, C. Boehme*, H. Huebl, M. Stutzmann, K. Lips, M. S. Brandt,

Electrical detection of 31P spin quantum states
, Nature Physics 2, 835 (2006).
also on arXiv – quant-ph: 0607178 (2006).

Principal Investigator: Christoph Boehme, Department of Physics and Astronomy, University of Utah,
115 S 1400 E, Salt Lake City, UT 84112-0830, phone 801.581.6806 fax 801.581.4801,
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