Fig. 1 1T-TaS2 single crystals with reduced thickness.

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Fig. 1 1T-TaS2 single crystals with reduced thickness. 1T-TaS2 single crystals with reduced thickness. (A) Crystal structure of the layered 1T-TaS2, where the planes of tantalum (Ta) atoms are surrounded by sulfur (S) atoms in an octahedral arrangement. The top view of the crystal structure shows a David-star cluster, where 12 Ta atoms within the layer move toward a 13th central Ta atom. Also shown is the optical microscope image of a typical nano-thick crystal device. (B) Schematic pictures of a Ta atom network in the CCDW (left), hexagonal NCCDW (middle), and ICCDW (right) phases. The dark blue circles represent the Ta atoms displaced from their undistorted lattice coordinates, forming the David-star clusters. (C) Temperature (T) dependence of the resistivity (ρ) for bulk and nano-thick crystals of 1T-TaS2. The solid and broken lines represent the ρ in the cooling and warming cycle, respectively. The notation sc-NCCDW represents supercooled NCCDW. (D) Temperature-thickness phase diagram of 1T-TaS2 nano-thick crystals upon cooling at 1 K/min. Masaro Yoshida et al. Sci Adv 2015;1:e1500606 Copyright © 2015, The Authors