Figure 2
From: Intrinsic radiative lifetime derived via absorption cross section of one-dimensional excitons
Micro-PL and micro-PLE spectra of the 100-period T-shaped quantum wires at 5 K.
(a) shows the PL spectrum at an excitation energy of 1.696 eV, illustrating that the emission peak from the T-wires is very sharp and strong; in contrast, the peaks from the arm and stem wells are very weak, indicating that most of the photo-generated carriers flow into the wires rapidly within their lifetime. (b) shows the PLE spectrum of the T-wires at excitation energies from 1.550 eV to 1.696 eV. The energy levels of the T-wire structure are clearly demonstrated, such as the wire state (1.582 eV), wire continuum states (greater than 1.592 eV), arm state (1.603 eV), arm continuum states (greater than 1.620 eV), stem state (1.636 eV) and stem continuum states (greater than 1.660 eV). The right vertical axis measures the absorption rate of the T-wires calibrated by the continuum state of the arm well indicated by the arrow (0.7%). Arb. unit is an abbreviation of arbitrary unit.
