Ultrafast Manipulation of Electron Spin Coherence

A technique is developed with the potential for coherent all-optical control over electron spins in semiconductors on femtosecond time scales. The experiments show that optical “tipping” pulses can enact substantial rotations of electron spins through a mechanism dependent on the optical Stark effect. These rotations were measured as changes in the amplitude of spin precession after optical excitation in a transverse magnetic field and approach π/2 radians. A prototype sequence of two tipping pulses indicates that the rotation is reversible, a result that establishes the coherent nature of the tipping process.

[1]  D. Awschalom,et al.  Spin precession and the optical Stark effect in a semiconductor-doped glass , 2001 .

[2]  D. Awschalom,et al.  Exciton spin polarization in magnetic semiconductor quantum wires , 2000 .

[3]  I. Smorchkova,et al.  Persistent photoconductivity in ii-vi magnetic two-dimensional electron gases , 1999 .

[4]  Jay Gupta,et al.  Spin coherence in semiconductor quantum dots , 1999 .

[5]  D. Awschalom,et al.  Resonant Spin Amplification in n-Type GaAs , 1998 .

[6]  D. DiVincenzo,et al.  Quantum computation with quantum dots , 1997, cond-mat/9701055.

[7]  Jeremy J. Baumberg,et al.  OPTICAL SPIN RESONANCE AND TRANSVERSE SPIN RELAXATION IN MAGNETIC SEMICONDUCTOR QUANTUM WELLS , 1997 .

[8]  Mlynek,et al.  Time-resolved two-dimensional spectroscopy of optically driven atomic sublevel coherences. , 1991, Physical review letters.

[9]  T. Kachlishvili.  On some magnetic field induced effects in 2-D Cd1−xMnxTe , 1991 .

[10]  Mlynek,et al.  Light-shift-induced spin echoes in a J=1/2 atomic ground state. , 1990, Physical review. A, Atomic, molecular, and optical physics.

[11]  Laser-induced exciton splitting. , 1989, Physical review letters.

[12]  M. Combescot,et al.  Excitonic Stark shift: A coupling to "semivirtual" biexcitons. , 1988, Physical review letters.

[13]  A. VonLehmen,et al.  Phonon sideband of quasi-two-dimensional excitons in GaAs quantum wells. , 1987 .

[14]  C. cohen-tannoudji,et al.  Dressed-atom description of resonance fluorescence and absorption spectra of a multi-level atom in an intense laser beam , 1977 .

[15]  C. cohen-tannoudji,et al.  Experimental Study of Zeeman Light Shifts in Weak Magnetic Fields , 1972 .

[16]  H. Carr,et al.  The Principles of Nuclear Magnetism , 1961 .