Fig. 4: Quantum-confined states in 1L-WSe2.
From: Strain fingerprinting of exciton valley character in 2D semiconductors
a Extracted energy positions vs. strain for sharp peaks in 1L-WSe2 (device 3), color-coded by gauge factor. The inset shows a PL line cut from the unstrained device. Note several sharp features with FWHM up to 4 times narrower compared to \({{{{\rm{X}}}}}_{{{{\rm{KK}}}}}^{0}\) (Supplementary Fig. S10). b Polarization-resolved emission of the peak P4 for three different directions of excitation polarization (grey, red, blue). The emission exhibits a preferred direction (black arrow), and is independent of the excitation polarization. c Top: SEM image of the membrane reveals several sub-μm folds along the emission direction of P4; Bottom: a cartoon depicting localized emission from an exciton trapped in a sharp potential.
