Tuning the tunnel coupling of quantum dot molecules with longitudinal magnetic fields

Details Tuning the tunnel coupling of quantum dot molecules with longitudinal magnetic fields Tuning the tunnel coupling of quantum dot molecules with longitudinal magnetic fields

2008-11-20

arxiv.org/abs/0811.3321v1

Appl. Phys. Lett. 93, 223109 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figs; accepted by Applied Physics Letters. After it is published it will be found at http://apl.aip.org/

Scientific paper

10.1063/1.3040058

We show that the energy splitting between the bonding and antibonding molecular states of holes in vertically stacked quantum dots can be tuned using longitudinal magnetic fields. With increasing field, the energy splitting first decreases down to zero and then to negative values, which implies a bonding-to-antibonding ground state transition. This effect is a consequence of the enhancement of the valence band spin-orbit interaction induced by the magnetic field, and it provides a flexible mechanism to switch the molecular ground state from bonding to antibonding.

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