Two-body Wigner molecularization in asymmetric quantum dot spin qubits

Abstract

Coulomb interactions strongly influence the energy spectrum and wave functions of few electrons or holes in single quantum dots. Indeed, for weak confinement potentials, the Coulomb repulsion splits apart the particles, leading to the formation of Wigner molecules. Here, the authors discuss how the confinement anisotropy favors the molecularization and compare the impact on readout and exchange interactions for spin qubits in different semiconductor materials.