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The two lowest single-particle hole states in two vertically coupled quntum dots (CQDs) are investigated by using the six-band KP model. A bonding-antibonding ground-state transition is observed with interdot distance increasing. This result is counterintuitive, for the antibonding molecular ground state has never been observed in natural diatomic molecules. By comparing the wavafunction component of hole, we verify that the reordering of bonding and antibonding orbitals with interdot distance increasing is caused by spin-orbit interaction of holes.
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Keywords:
- coupled quantum dots /
- antibonding ground-state /
- six-band KP model /
- spin-orbit interaction
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[1] Wu S Q, Chen J F, Zhao G P 2004 Acta Phys. Sin. 61 087203 (in Chinese) [吴绍全, 陈佳峰, 赵国平 2012 61 087203]
[2] Holleitner A W, Blick R H, Httel A K, Eberl K, Kotthaus J P 2002 Science. 297 70
[3] Bayer M, Hawrylak P, Hinzer K, Fafard S, Korkusinski M, Wasilewski Z R, Stern O, Forchel A 2001 Science. 291 451
[4] Krenner H J, Sabathil M, Clark E C, Kress A, Schuh D, Bichler M, Abstreiter G, Finley J J 2005 Phys. Rev. Lett. 94 057402
[5] Doty M F, Climente J I, Greilich A, Yakes M, Bracker A S, Gammon D 2010 Phys. Rev. B 81 035308
[6] Yakimov A I, Bloshkin A A, Dvurechenskii A V 2008 Phys. Rev. B 78 165310
[7] Bester G, Zunger A, Shumway J 2005 Phys. Rev. B 71 075325
[8] Climente J I, Korkusinski M, Goldoni G, Hawrylak P 2008 Phys. Rev. B 78 115323
[9] Jask'olski W, Zieli'nski M, Bryant G W, Aizpurua J 2006 Phys. Rev. B 74 195339
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