Fig. 1: Large-scale and high-quality monolayer 1T NbSe2 with “Star of David” (SOD) CDW pattern. | Nature Communications

Fig. 1: Large-scale and high-quality monolayer 1T NbSe2 with “Star of David” (SOD) CDW pattern.

From: Direct identification of Mott Hubbard band pattern beyond charge density wave superlattice in monolayer 1T-NbSe2

Fig. 1

a Large-scale STM image of MBE-grown NbSe2 islands on BLG/SiC(0001), showing ML 1T-NbSe2 island with edge length 120 nm at the center. b Side view of schematic atomic model of ML 1T-NbSe2 on BLG/SiC(0001) substrate. c Zoomed-in image of dashed black square in a showing both CDW pattern and atomic resolution of ML 1T-NbSe2 surface. Inset shows FFT image. d Zoomed-in image showing basis vector of CDW unit cell (with unit vectors b1 and b2) and atomic lattice of Top-Se layer (with unit vectors a1 and a2); the SOD (green star) was imaged as six top Se atoms (brown dots). e Top view of atomic model of NbSe2, showing SOD pattern and rhombus unit cell. f SOD model showing 13 Nb atoms at three different equivalent sites with six-fold symmetry. Central Nb atom (Nb1) labeled with schematic \(d_{z^2}\) orbital to indicate spatial distribution. Scanning parameters: a bias voltage VB = −1.5 V, tunneling current It = 20 pA; c and d, VB = −1.5 V, It = 500 pA.

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