Angle-resolved photoemission spectroscopy study of the charge density wave order in layered semiconductor EuTe4

Abstract

Layered tellurides have been extensively studied as a platform for investigating the Fermi surface (FS) nesting-driven charge density wave (CDW) states. EuTe4, one of quasi-two-dimensional (quasi-2D) binary rare-earth tetratellurides CDW compounds, with unconventional hysteretic transition, is currently receiving much attention. Here, the CDW modulation vector, momentum and temperature dependence of CDW gaps in EuTe4 are investigated using angle-resolved photoemission spectroscopy. Our results reveal that (i) a FS nesting vector q ~ 0.67 b* drives the formation of CDW state, (ii) a large anisotropic CDW gap is fully open in the whole FS, and maintains a considerable size even at 300 K, leading to appearance of semiconductor properties, (iii) an abnormal non-monotonic increase of CDW gap in magnitude as a function of temperature, (iv) an extra, larger gap opens at a higher binding energy due to the interaction between the different orbits of the main bands.

5 pages, 4 figures

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Cited by in corpus (7)

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• Coexistence of interacting charge density waves in a layered semiconductor
• Large moiré superstructure of stacked incommensurate charge density waves
• Enhanced thermopower in a magnetic semiconductor EuTe4 with multiple charge-density-wave instabilities/
• Bidirectional ultrafast control of charge density waves via phase competition
• Observation of momentum dependent charge density wave gap in EuTe4
• Nesting-driven antiferromagnetic order in Kondo lattice CePd5Al2