Hole-spin mixing in InAs quantum dot molecules

Physical Review B - Condensed Matter and Materials Physics

Volumn 81, Issue 3, 2010, Pages

  Doty, M F ^a,b   Climente, J I ^c   Greilich, A ^b   Yakes, M ^b   Bracker, A S ^b   Gammon, D ^b  

^a UNIVERSITY OF DELAWARE   (United States)

^b NAVAL RESEARCH LABORATORY   (United States)

^c UNIVERSITAT JAUME I   (Spain)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 77954826237     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.81.035308     Document Type: Article

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36. For the particular QDM shown in Fig. the dark exciton lies 202 μ eV below the bright exciton.
37. We observe that the coupling of the atomic ground state of the bottom dot with the first atomic excited state of the top dot leads to a larger anticrossing than the coupling of the two ground states. This is also consistent with a lateral misalignment of the dots, as the first atomic excited state has a p -like envelope function that could couple more easily to a misaligned bottom dot than the s -like envelope of the atomic ground state.
38. For sufficiently strong tunneling they may even replace HH as the ground state, see Ref..
39. The misalignment modifies not only the magnitude of the spin-flip tunneling rate but also that of the spin-conserving one. Therefore, for a given barrier thickness and lateral offset, the states with opposite pseudospin may not intersect. This is why in Fig. inset we only plot segments.
40. We note that the k p theory with the inclusion of lateral offsets predicts two anticrossings with different magnitudes. Recent data suggests that this is observed in certain samples. We anticipate further exploration of this anticrossing asymmetry in a future publication.
41. S h would be even closer to ± 1 / 2 if we included strain in our model, further reducing the LH contribution to the low-lying spinors.
42. Due to the strong tunneling of LHs, the corresponding antibonding states are much higher in energy and have negligible influence on the spin mixing.