Using a Tunable Quantum
Wire To Measure the Large out-of-Plane Spin Splitting of Quasi Two-Dimensional
Holes in a GaAs Nanostructure
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Abstract
The out-of-plane <i>g</i>-factor <i>g</i><sub>⊥</sub><sup>*</sup> for
quasi two-dimensional (2D) holes in a (100) GaAs heterostructure is
studied using a variable width quantum wire. A direct measurement
of the Zeeman splitting is performed in a magnetic field applied perpendicular
to the 2D plane. We measure an out-of-plane <i>g</i>-factor
up to <i>g</i><sub>⊥</sub><sup>*</sup> = 5, which is larger than previous optical
studies of <i>g</i><sub>⊥</sub><sup>*</sup> and is approaching the long predicted but
never experimentally verified out-of-plane <i>g</i>-factor
of 7.2 for heavy holes