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An exciton is a bound state of an electron and an electron hole which are attracted to each other by the electrostatic Coulomb force.
Once phosphorylated, PKB is in its active form and phosphorylates TBC1D4, which inhibits the GAP domain or the GTPase-activating domain associated with TBC1D4, allowing for Rab protein to change from its GDP to GTP bound state.
However, while this "toy model" is superficially convincing, the Ehrenfest theorem seems to suggest that since the electronic motion in the direction is that of a bound state that confines it to the 2D surface, the time-averaged electric field (i.e., including that of the potential that binds it to the 2D surface) that the electron experiences must be zero!