Published in PRL: Isotropic and Anisotropic g-Factor Corrections in GaAs Quantum Dots


The spin splitting defines the energy of the spin qubit and is one of the fundamental properties of a spin in a B-field. Here, we measure and separate the isotropic and anisotropic corrections to the g-factor in two GaAs devices, finding good agreement with recent theory. Beyond the well established Rashba and Dresselhaus terms, we also identify a momentum-square-dependent Zeeman term g_43 and a (smaller) term from the penetration into the AlGaAs barrier g_P (see Figure).

Collaboration between Basel (exp.& th.), RIKEN (theory) and UCSB (2DEG).

Camenzind, Svab et al., Phys. Rev. Lett. 127, 057701 (Jul 29, 2021)