Fig. 1
From: Observation of topologically protected states at crystalline phase boundaries in single-layer WSe2
Atomic structure of mixed-phase single-layer WSe2. a Calculated unit cells and side-view sketches of the 1T′ and 1H phases of single-layer WSe2. Se (W) atoms are depicted in blue (orange). b RHEED pattern of single-layer 1T′/1H-mixed-phase WSe2. Red and white arrows indicate diffraction stripes from 1T′ and 1H phases, respectively. c Core-level XPS spectrum of single-layer 1T′/1H mixed-phase WSe2. Insets show zoom-in of the Se (blue) and W (orange) peaks for the 1T′ (dT’, fT’) and 1H (dH, fH) phases. d Atomically resolved STM image of single-layer 1T′-WSe2. The unit cell is indicated in blue (Vs = +500 mV, It = 1 nA). e Side and top view close-up of the 1T′-WSe2 STM image with a sketch of calculated 1T′-WSe2 (only upper-layer Se atoms are depicted in top view)
