Fig. 2: Long-ranged CO revealed by STM. | Nature Communications

Fig. 2: Long-ranged CO revealed by STM.

From: Discovery of a long-ranged charge order with 1/4 Ge1-dimerization in an antiferromagnetic Kagome metal

Fig. 2

a, b Typical dI/dV maps for the Fe3Ge and Ge2 layers of sample #2, both including a single-unit-cell-height step. Insets of (a and b) show their fast Fourier transform (FFT) images, with the Bragg spots of underlying lattice and CO spots labeled as qa and q2a, respectively. c, d Enlarged images of the areas enclosed by the orange boxes in (a and b), respectively. e Illustration of the CO patterns near a single-unit-cell-height step. The orange circles represent the charge maxima, each black hexagon represents a minimal unit of the CO. Green lines in (c–e) track the chains with CO modulation, which shifts half unit-cell across the step edges. f, g Representative dI/dV spectra collected in the sample regions with or without CO in Fe3Ge and Ge2 layers of samples #1 and #2, respectively. Measurement conditions: (a) Vb = 0.3 V, It = 300 pA, ΔV = 20 mV; (b) Vb = 0.2 V, It = 300 pA, ΔV = 30 mV; (f, g) Vb = 100 mV, It = 100pA, ΔV = 2 mV.

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