Fig. 4: Temperature-dependent PL and origin of narrow IX lines.
From: Localized interlayer excitons in MoSe2–WSe2 heterostructures without a moiré potential
a PL of the narrow IX lines in the DC region as a function of temperature shows the width of individual lines are increasing by 9 K and disappear completely by 17 K. The signal in the DC region includes narrow emission on top of a wider PL plateau. The wider emission persists to higher temperature (see Supplementary Fig. 6) that is consistent with previous temperature-dependent measurements on R-type heterostructures. b Temperature-dependent PL from the hBN separated region shows the narrow lines are widening by 9 K which is in good agreement with the DC region’s temperature-dependent PL. The hBN separated IX signal disappears fully by 13 K and does not have a wider PL plateau. c Spectrally integrated PL shows IX emission in the hBN separated region disappears completely by 19 K whereas the signal from the DC region is approximately constant. d Depiction of the IX energy as a function of position in the moiré, for DC region (black) and hBN separated (Sep.) region (green). Both regions exhibit a weak extrinsic trapping potential denoted by the fluctuations. The DC region has both moiré trapping and extrinsic fluctuations.
