Figure 1

(Color online) Square of the first two electron and first two hole wave functions of an $\mathrm{In}\mathrm{Ga}\mathrm{As}∕\mathrm{Ga}\mathrm{As}$ quantum dot as a function of electric field at an interdot separation $d=7.9\mathrm{nm}$.Reuse & Permissions

Figure 2

Single particle electron (upper panel) and hole (lower panel) eigenvalues as a function of electric field for $d=7.9\mathrm{nm}$ with respect to the GaAs valence band maximum. We indicate the localization of the MOs on top and bottom dot by $e_T$, $e_B$,$h_T$,$h_B$.Reuse & Permissions

Figure 3

(Color online) Transition energies for $d=7.9\mathrm{nm}$ as a function of electric field in different approximations. (a) Single particle transition energies ${\epsilon }_g$. (b) Direct electron-hole Coulomb matrix elements between MOs $J_{e,h}$. (c) Transition energies including electron-hole Coulomb interaction ${\epsilon }_g^{i,j}+J_{e,h}^{i,j}$, but without correlation effects. (d) Final correlated exciton results. The bidot products ($e_T{h}_T$, etc.) are given whenever the MO states (given on the right) are strongly dominated by one of these products. The position of the single-particle tuning field $F_{\mathrm{SPT}}$, where the single-particle wave functions are equally distributed over both dots, and the maximum entanglement field $F_{S\max }$ are marked in panel (c).Reuse & Permissions

Figure 4

(Color online) Occupation probabilities given as the bidot products $e_T{h}_T$ or $e_T{h}_B$ or $e_B{h}_T$ and $e_B{h}_B$ as a function of the electric field for the first four exciton states ∣1⟩ (a), ∣2⟩ (b), ∣3⟩ (c), and ∣4⟩ (d) for $d=7.9\mathrm{nm}$.Reuse & Permissions

Figure 5

(Color online) Entropy of entanglement for the first four exciton states as a function of electric field applied along the [001] direction.Reuse & Permissions

Figure 6

Oscillator strength of the first four transitions (first 16 transitions including spin) as a function of electric field. The single particle tuning field $F_{\mathrm{SPT}}$ and the field of maximum entanglement $F_{S\max }$ are marked. The arrows are merely a guide to the eye for the weak transitions ∣3⟩ and ∣4⟩.Reuse & Permissions

Figure 7

(Color online) Formation of the highly entangled excitonic states at the critical field $F_{S\max }$ $(-5.4\mathrm{kV}∕\mathrm{cm})$. (a) Single particle electron and hole levels in the dot-localized basis. (b) Simple differences between the single particle electron and hole energies from (a). (c) Adding electron-hole direct Coulomb interaction to (b). (d) Adding electron and hole hopping the the levels from (c).Reuse & Permissions