Using a Tunable Quantum Wire To Measure the Large out-of-Plane Spin Splitting of Quasi Two-Dimensional Holes in a GaAs Nanostructure

Abstract

The out-of-plane <i>g</i>-factor <i>g</i>_⊥^* 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>_⊥^* = 5, which is larger than previous optical studies of <i>g</i>_⊥^* and is approaching the long predicted but never experimentally verified out-of-plane <i>g</i>-factor of 7.2 for heavy holes