Schematic representation of the QDSLW geometry and the corresponding potential profiles of electrons and holes. A superlattice of 20 quantum dots (InP barriers) embedded in the central part of a 300-nm-long rod of InP nanowire.
Comparison of the exciton-dominated optical-absorption spectrum and joint density of states in an ideal 1D QDSLW and in a plain 1D QW.
Size dependence of the exciton dominant optical-absorption spectra in the QDSLW. The radius of the cylindrical QDSLW is , 3.6, and 4.5 nm, respectively.
Optical absorption in the QDSLW in the presence of a dc field along the wire with different field strengths. With the field strength increasing, the main exciton peak shift to the lower-energy side and its magnitude decreases and the minor peak next to the main exciton peak increases and redshifts.
Optical absorption in the QDSLW in the presence of a terahertz field along the wire. (a) Different frequencies , 11, and 20 meV, with field strength fixed at ; (b) Different field strengths , 30, 50, and , with frequency fixed at . Autler-Townes splitting of the exciton peak and one-photon and two-photon gain spectra at different field strengths.
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