Ultrafast Coherent Electron Spin Flip in a Modulation-Doped CdTe Quantum Well

Carey Phelps (1) , Timothy Sweeney (1) , R. Cox (2) , Hailin Wang (1)

1 OSU - Oregon State University
2 NEEL - NPSC - Nanophysique et Semiconducteurs

We report the experimental realization of coherent electron spin flip in a modulation-doped CdTe quantum well. Coherent spin rotation is realized with an off-resonant laser pulse, which induces a polarization-dependent optical Stark shift in the trion resonance. Complete electron spin flip is made possible by a laser pulse designed to avoid excessive excitations of nearby exciton resonances and minimizes detrimental many-body effects. These results demonstrate an effective approach for ultrafast optical spin control in a complex spin system.

Domaines: Systèmes mésoscopiques et effet Hall quantique [cond-mat.mes-hall]

Carey Phelps, Timothy Sweeney, R. Cox, Hailin Wang. Ultrafast Coherent Electron Spin Flip in a Modulation-Doped CdTe Quantum Well. Physical Review Letters, 2009, 102, pp.237402. ⟨10.1103/PhysRevLett.102.237402⟩. ⟨hal-00999763⟩