Hole spin quantum beats in quantum-well structures

Abstract

We report experimental and theoretical investigations of the quantized hole states in a magnetic field. We observe spin quantum beats in the time-resolved photoluminescence of N-modulation-doped ${\mathrm{G}\mathrm{a}\mathrm{A}\mathrm{s}/\mathrm{A}}_x{\mathrm{Ga}}_{1-x}\mathrm{As}$ quantum wells in a magnetic field perpendicular to the growth direction. The measurement of these quantum beats, which originate from the Larmor precession of heavy-hole spins, yields the accurate determination of the transverse heavy-hole Landé g factor. We find $|g_{h,\perp }|=0.04\mathrm{}\pm 0.01,$ in good agreement with the theoretical calculations based on the k⋅p theory in the five level model.