Epitaxial DyTe_{2-δ} films on MgO show a Te-deficiency supercell attributed via DFT to Fermi surface nesting that periodically occupies the Te square net and opens a gap.
Revealing Charge Density Wave Formation in the LaTe_2 System by Angle Resolved Photoemission Spectroscopy
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abstract
We present the first direct study of charge density wave (CDW) formation in quasi-2D single layer LaTe_2 using high-resolution angle resolved photoemission spectroscopy (ARPES) and low energy electron diffraction (LEED). CDW formation is driven by Fermi surface (FS) nesting, however characterized by a surprisingly smaller gap (50meV) than seen in the double layer RTe_3 compounds, extending over the entire FS. This establishes LaTe_2 as the first reported semiconducting 2D CDW system where the CDW phase is FS nesting driven. In addition, the layer dependence of this phase in the tellurides and the possible transition from a stripe to a checkerboard phase is discussed.
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cond-mat.mtrl-sci 1years
2023 1verdicts
UNVERDICTED 1representative citing papers
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Supercell formation in epitaxial rare-earth ditelluride thin films
Epitaxial DyTe_{2-δ} films on MgO show a Te-deficiency supercell attributed via DFT to Fermi surface nesting that periodically occupies the Te square net and opens a gap.