title: Antibonding ground states in InAs quantum-dot molecules.
abstract: Coherent tunneling between two InAs quantum dots forms delocalized molecular states. Using magnetophotoluminescence spectroscopy we show that when holes tunnel through a thin barrier, the lowest energy molecular state has bonding orbital character. However, as the thickness of the barrier increases, the molecular ground state changes character from a bonding orbital to an antibonding orbital, confirming recent theoretical predictions. We explain how the spin-orbit interaction causes this counterintuitive reversal by using a four-band k.p model and atomistic calculations that account for strain.
authors.affiliation: Naval Research Laboratory, Washington, DC 20375, USA. doty@udel.edu
authors.forename: M F
authors.initials: MF
authors.lastname: Doty
authors.forename: J I
authors.initials: JI
authors.lastname: Climente
authors.forename: M
authors.initials: M
authors.lastname: Korkusinski
authors.forename: M
authors.initials: M
authors.lastname: Scheibner
authors.forename: A S
authors.initials: AS
authors.lastname: Bracker
authors.forename: P
authors.initials: P
authors.lastname: Hawrylak
authors.forename: D
authors.initials: D
authors.lastname: Gammon