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 dot p model and atomistic calculations that account for strain.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 28, 2009
- Accession Number
- ADA549964
Entities
People
- Allan S. Bracker
- D. Gammon
- J. I. Climente
- M. F. Doty
- M. Korkusinski
- M. Scheibner
- P. Hawrylak
Organizations
- United States Naval Research Laboratory