Extended Data Fig. 2: Identifying monolayer and bulk WSe2.
From: Attosecond clocking of correlations between Bloch electrons
a, Optical microscopy picture of the exfoliated sample on a diamond substrate. The monolayer part of the WSe2 crystal is indicated by the red dashed line. Circles (diameter corresponds to the NIR spot size in focus) show the spots used for the monolayer (blue) and bulk (orange) measurements presented in the main text. b, Photoluminescence (red colour map) and transmission (blue colour map) of the sample using a continuous-wave laser with a centre wavelength of 532 nm. c, Schematic cross-section of the WSe2 sample consisting of a bulk and monolayer (ML) part next to each other on a diamond substrate. The incident light (NIR and THz) hits the sample from the WSe2 side. Remaining NIR and THz radiation as well as the emitted HSB radiation are transmitted through the diamond substrate.
