title: Hole spin relaxation in InAs/GaAs quantum dot molecules.
abstract: We calculate the spin-orbit induced hole spin relaxation between Zeeman sublevels of vertically stacked InAs quantum dots. The widely used Luttinger-Kohn Hamiltonian, which considers coupling of heavy- and light-holes, reveals that hole spin lifetimes (T1) of molecular states significantly exceed those of single quantum dot states. However, this effect can be overcome when cubic Dresselhaus spin-orbit interaction is strong. Misalignment of the dots along the stacking direction is also found to be an important source of spin relaxation.
authors.affiliation: Departament de Química Física i Analítica, Universitat Jaume I, Castelló de la Plana, Spain.
authors.forename: C
authors.initials: C
authors.lastname: Segarra
authors.forename: J I
authors.initials: JI
authors.lastname: Climente
authors.forename: F
authors.initials: F
authors.lastname: Rajadell
authors.forename: J
authors.initials: J
authors.lastname: Planelles