Hole spin dynamics and hole $g$ factor anisotropy in coupled quantum well systems

Abstract

Due to its p-like character, the valence band in GaAs-based heterostructures offers rich and complex spin-dependent phenomena. One manifestation is the large anisotropy of Zeeman spin splitting. Using undoped, coupled quantum wells (QWs), we examine this anisotropy by comparing the hole spin dynamics for high- and low-symmetry crystallographic orientations of the QWs. We directly measure the hole $g$ factor via time-resolved Kerr rotation, and for the low-symmetry crystallographic orientations (110) and (113a), we observe a large in-plane anisotropy of the hole $g$ factor, in good agreement with our theoretical calculations. Using resonant spin amplification, we also observe an anisotropy of the hole spin dephasing in the (110)-grown structure, indicating that crystal symmetry may be used to control hole spin dynamics.

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• Dimensional reduction of the Luttinger Hamiltonian and g-factors of holes in symmetric two-dimensional semiconductor heterostructures
• Ultrafast pseudospin quantum beats in multilayer WSe${}_2$ and MoSe${}_2$
• The in-plane anisotropy of the hole $g$ factor in CdTe/(Cd,Mg)Te quantum wells studied by spin-dependent photon echoes
• Asymmetric $g$ tensor in low-symmetry two-dimensional hole systems
• Spin dynamics and magneto-optical response in charge-neutral tunnel-coupled quantum dots
• Reliable modeling of weak antilocalization for accurate spin-lifetime extraction