Vertically coupled double quantum dots in magnetic fields

Details Vertically coupled double quantum dots in magnetic fields Vertically coupled double quantum dots in magnetic fields

1999-01-24

arxiv.org/abs/cond-mat/9901254v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

to be published in Phys. Rev. B15

Scientific paper

10.1103/PhysRevB.59.5817

Ground-state and excited-state properties of vertically coupled double quantum dots are studied by exact diagonalization. Magic-number total angular momenta that minimize the total energy are found to reflect a crossover between electron configurations dominated by intra-layer correlation and ones dominated by inter-layer correlation. The position of the crossover is governed by the strength of the inter-layer electron tunneling and magnetic field. The magic numbers should have an observable effect on the far infra-red optical absorption spectrum, since Kohn's theorem does not hold when the confinement potential is different for two dots. This is indeed confirmed here from a numerical calculation that includes Landau level mixing. Our results take full account of the effect of spin degrees of freedom. A key feature is that the total spin, $S$, of the system and the magic-number angular momentum are intimately linked because of strong electron correlation. Thus $S$ jumps hand in hand with the total angular momentum as the magnetic field is varied. One important consequence of this is that the spin blockade (an inhibition of single-electron tunneling) should occur in some magnetic field regions because of a spin selection rule. Owing to the flexibility arising from the presence of both intra-layer and inter-layer correlations, the spin blockade is easier to realize in double dots than in single dots.

Affiliated with

Also associated with

No associations

Rating

Vertically coupled double quantum dots in magnetic fields does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Vertically coupled double quantum dots in magnetic fields, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Vertically coupled double quantum dots in magnetic fields will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-637355