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| Paper IPM / Physic / 17975 |
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Topological semimetals have emerged as quantum materials including Dirac, Weyl, and nodal line semimetals, and so on. Dirac nodal line (DNL) semimetals possess topologically nontrivial bands crossing along a line or a loop and are considered precursor states for other types of semimetals. Here, we combine scanning tunneling microscopy/spectroscopy (STM/S) measurements and density functional theory (DFT) calculations to investigate a twist angle tuning of electronic structure in two-dimensional DNL semimetal Au$_2$Ge. Theoretical calculations show that two bands of Au$_2$Ge touch each other in $\Gamma$-M and $\Gamma$-K paths, forming a DNL. A significant transition of electronic structure occurs by tuning the twist angle from 30 to 24-degree between monolayer Au$_2$Ge and Au(111), as confirmed by STS measurements and DFT calculations. The disappearing of DNL state is a direct consequence of symmetry breaking.
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