“…As a result, the energy separation between the two bands increased from 38 to 73 meV when L decreased from 42 to 8 nm, as shown in Figure c. According to previous studies, the magnitude of the valley splitting ( i.e ., energy separation of the two bands) of PbSe QDs is intrinsically determined by the size and shape of QDs and nanorods. − Also, the energy separation of 38 meV before the appearance of FRET agrees well with the L-valley splitting of ∼30 meV previously reported for PbSe QDs with a diameter of 5.2 nm, strongly supporting the current assignment of splitting. However, in the present study the energy separation increased with decreasing L without changing the size and shape of the QDs.…”