Fig. 1: Scanning tunneling microscopy of graphene covered 1T-TaS2.
From: Proximity induced charge density wave in a graphene/1T-TaS2 heterostructure
a Schematic of the device and STM measurement setup. b Cartoon showing a single star-of-David (red) in 1T-TaS2. The black arrows denote the displacement of Ta atoms towards a central Ta atom. c The transition temperatures between the incommensurate CDW (ICCDW), nearly commensurate CDW (NCCDW), and commensurate CDW (CCDW) phases of 1T-TaS2. d Cartoon showing a monolayer graphene layer on top of 1T-TaS2. Here, the angle between the graphene layer and 1T-TaS2 is 13.9° to form a commensurate unit cell (cyan) for DFT calculations. e An STM topography image of graphene-covered 1T-TaS2 measured at 77 K using a tunneling set point of I = 150 pA, Vb = 250 mV. Each bright spot corresponds to a star of David with a measured CDW wavelength of 1.2 nm. This can also be seen in the 2D-FFT of the topography data (inset). f An STM topography image and its 2D FFT (inset) of a bulk 1T-TaS2 sample measured at 77 K using a tunneling set point of I = 150 pA, Vb = 500 mV. The crystals in panels b and d were plotted using VESTA49.
