Optical properties of the charge-density-wave compound<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>CeTe</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>

Lee, K. E.; Lee, C. I.; Oh, Hyoung‐Chul; Jung, Moonyoung; Min, Baehyun; Im, H.J.; Iizuka, Toshiaki; Lee, Y. S.; Kimura, S.

doi:10.1103/physrevb.78.134408

Cited by 5 publications

(4 citation statements)

References 13 publications

(22 reference statements)

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“…The reduction of the CDW gap near the  point can be explained by the imperfect nesting near this momentum region, which has also been observed in other RETe3 CDW materials [41,42]. The large CDW gap observed in CeSbTe is comparable to CeTe2 (with a half gap ~0.2 eV) [47,48] and CeTe3…”

Section: Resultssupporting

confidence: 52%

“…The reduction of the CDW gap near the point can be explained by the imperfect nesting near this momentum region, which has also been observed in other RETe 3 CDW materials [41,42]. The large CDW gap observed in CeSbTe is comparable to CeTe 2 (with a half gap~0.2 eV) [47,48] and CeTe 3 (with a half gap~0.2 eV) [40,49], indicating that their CDW orders share much in common. The large CDW gap also provides a natural explanation for the robustness of the CDW order even at high temperatures.…”

Section: Resultsmentioning

confidence: 52%

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Charge density wave and weak Kondo effect in a Dirac semimetal CeSbTe

Fang

et al. 2021

Sci. China Phys. Mech. Astron.

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Using angle-resolved photoemission spectroscopy (ARPES) and low-energy electron diffraction (LEED), together with densityfunctional theory (DFT) calculation, we report the formation of charge density wave (CDW) and its interplay with the Kondo effect and topological states in CeSbTe. The observed Fermi surface (FS) exhibits parallel segments that can be well connected by the observed CDW ordering vector, indicating that the CDW order is driven by the electron-phonon coupling (EPC) as a result of the nested FS. The CDW gap is large (~0.3 eV) and momentum-dependent, which naturally explains the robust CDW order up to high temperatures. The gap opening leads to a reduced density of states (DOS) near the Fermi level (E F ), which correspondingly suppresses the many-body Kondo effect, leading to very localized 4f electrons at 20 K and above. The topological Dirac cone at the X point is found to remain gapless inside the CDW phase. Our results provide evidence for the competition between CDW and the Kondo effect in a Kondo lattice system. The robust CDW order in CeSbTe and related compounds provide an opportunity to search for the long-sought-after axionic insulator.

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Section: Resultssupporting

confidence: 52%

Section: Resultsmentioning

confidence: 52%

Charge density wave and weak Kondo effect in a Dirac semimetal CeSbTe

Fang

et al. 2021

Sci. China Phys. Mech. Astron.

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“…2(c) and 2(d). The CDW gaps are found to open only partially in some part of the FS, which is consistent with the semimetallic nature of RTe 2 [17,27,28]. The overall similarity of the FS/CE maps of CeTe 2 and PrTe 2 , as well as those of LaTe 2 [15], implies that the contribution of the R 4f (R = Ce, Pr) electrons to the states at E F is minor.…”

Section: Resultssupporting

confidence: 64%

Angle-resolved and resonant photoemission spectroscopy study of the Fermi surface reconstruction in the charge density wave systemsCeTe2andPrTe2

et al. 2015

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The electronic structures of a charge density wave (CDW) system RTe 2 (R = Ce, Pr) have been investigated by employing angle-resolved photoemission spectroscopy (ARPES) and the first-principles band structure method. The R 4f hybridization peak (4f n c m−1 ) in the R 4f PES spectrum is located deeper in PrTe 2 than in CeTe 2 and R 4f spectral intensity near E F is much weaker in PrTe 2 than in CeTe 2 , implying the importance of the hybridization between Ce 4f and Te(1) 5p electrons. For both CeTe 2 and PrTe 2 , the metallic states crossing the Fermi level (E F ) are observed below the CDW transition temperature, indicating the existence of the partially ungapped Fermi surfaces (FSs). The zigzag features having the fourfold rotational symmetry are observed near the X point in the FS of CeTe 2 , but not in the FS of PrTe 2 . The tight-binding model calculations show that the zigzag FS features in CeTe 2 can be described as the CDW-induced FS reconstruction due to the 4 × 4 CDW supercell structure. The effect of the linear dichroism is observed in ARPES, suggesting that the E F -crossing states have mainly the in-plane orbital character. The photon-energy maps for the near-E F states exhibit the straight vertical dispersions for both CeTe 2 and PrTe 2 , demonstrating the dominant two-dimensional character in RTe 2 (R = Ce, Pr).

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“…Second, the opening of the CDW gaps occurs only partially in some part of the FS, which is consistent with the semimetallic nature of CeTe 2 . 2,18,19 Recently, Johannes and Mazin 20 showed that the FS nesting does not necessarily produce a peak in the susceptibility χ (q) that leads to the CDW instability. given wave vector q ("nesting") or from the parallel bands spanned by a q vector ("volume effects").…”

Section: Experimental and Calculational Detailsmentioning

confidence: 99%

Fermi surface reconstruction in CeTe2induced by charge density waves investigated via angle resolved photoemission

et al. 2012

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Electronic structures of a charge-density wave (CDW) system CeTe 2−x Sb x (x = 0, 0.05) have been investigated by employing angle-resolved photoemission spectroscopy (ARPES) and the first-principles electronic and phonon band-structure methods. The observed Fermi surface (FS) agrees very well with the calculated FS for the undistorted CeTe 2 both in shapes and sizes. The metallic states crossing the Fermi level (E F ) are observed in ARPES even in the CDW state. The carriers near E F have mainly the Te(1) 5p character, with a negligible contribution from Ce 4f states. The supercell (shadow) bands and the corresponding very weak FSs are found to arise from band folding due to the interaction of Te(1) layers with Ce-Te(2) layers. We found that the CDW modulation vector is along -X (Q CDW ≈ X), which is not coincident with the most prominent FS nesting vector.

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Optical properties of the charge-density-wave compoundCeTe2

Cited by 5 publications

References 13 publications

Charge density wave and weak Kondo effect in a Dirac semimetal CeSbTe

Charge density wave and weak Kondo effect in a Dirac semimetal CeSbTe

Angle-resolved and resonant photoemission spectroscopy study of the Fermi surface reconstruction in the charge density wave systemsCeTe2andPrTe2

Fermi surface reconstruction in CeTe2induced by charge density waves investigated via angle resolved photoemission

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