Fig. 4: Resolving CDW pattern in Mott insulator gap. | Nature Communications

Fig. 4: Resolving CDW pattern in Mott insulator gap.

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

Fig. 4

a Area of 1T-NbSe2; AA′ is the line along which line dI/dV spectra were obtained. b Line dI/dV spectra captured along six CDW periods (AA′ in a) showing Mott gap between UHB and LHB. c Zoomed-in line dI/dV spectra in b, showing residual conductance within the gap, lacking periodicity. d Bias-dependent images showing CDW pattern clearly in Mott insulator gap. Energy positions are labeled in c, tunneling parameters: a −1.5 V, 10 pA; b −1.5 V, 1 nA; c −0.1 V, 0.5 nA before turning off feedback loop.

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