We investigated the energy gap of the incommensurate charge density wave (CDW) in $1T\text{−}{\mathrm{VSe}}_2$ using scanning tunneling microscopy/scanning tunneling spectroscopy. We found that the dip structure observed near 0 mV in the tunneling spectrum for the CDW state was absent just above the CDW transition temperature. Moreover, we observed a spatial variation of the tunneling spectrum, which suggests that the periodic modulation of the electronic local density of states due to the CDW is inverted near $E_{\mathrm{F}}$. Based on these results, we conclude that the incommensurate CDW gap in ${\mathrm{VSe}}_2$ opens near $E_{\mathrm{F}}$.

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• Charge density waves
• Transition metal dichalcogenides
• Scanning tunneling microscopy
• Scanning tunneling spectroscopy