Electric-field control of a hydrogenic donor's spin in a semiconductor

ORAL

Abstract

The orbital wave function of an electron bound to a single donor in a semiconductor can be modulated by an applied AC electric field, which affects the electron spin dynamics via the spin-orbit interaction. Numerical calculations of the spin dynamics of a single hydrogenic donor (Si) using a real-space multi-band $k\cdot p$ formalism show that in addition to breaking the high symmetry of the hydrogenic donor state, the g-tensor has a strong nonlinear dependence on the applied fields. By explicitly integrating the time dependent Schr\"odinger equation it is seen that Rabi oscillations can be obtained for electric fields modulated at sub-harmonics of the Larmor frequency. The Rabi frequencies obtained from sub-harmonic modulation depend on the magnitudes of the AC and DC components of the electric field. For a purely AC field, the highest Rabi frequency is obtained when E is driven at the 2nd sub-harmonic of the Larmor frequency. Apart from suggesting ways to measure g-tensor anisotropies and nonlinearities, these results also suggest the possibility of direct frequency domain measurements of Rabi frequencies.

*C.E.P. would like to acknowledge an NSF NIRT. M.E.F. would like to acknowledge an ONR MURI.

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Authors

  • Amrit De

    • Department of Physics and Astronomy, University of Iowa
    • Department of Physics and Astronomy,University of Iowa

  • Craig Pryor

    • Department of Physics and Astronomy, University of Iowa
    • Department of Physics and Astronomy,University of Iowa
    • Dept. of Physics, University of Iowa.
    • University of Iowa
    • Dept. of Physics and Astronomy, University of Iowa

  • M. E. Flatt\'e

    • Department of Physics and Astronomy, University of Iowa
    • Optical Science and Technology Center and Department of Physics and Astronomy, University of Iowa
    • Dept. of Physics, University of Iowa.
    • University of Iowa
    • Department of Physics and Astronomy University of Iowa
    • OSTC and Department of Physics and Astronomy, University of Iowa
    • Dept. of Physics, University of Iowa, Iowa City, IA 52242