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The growing charge-density-wave order in CuTe lightens and speeds up electrons

Author

Listed:
  • I-Ta Wang

    (National Taiwan University
    National Taiwan University
    National Taiwan University (NTU-MST)
    Academia Sinica)

  • Ta-Lei Chou

    (National Taiwan University
    National Taiwan University)

  • Chih-En Hsu

    (Tamkang University)

  • Zhujialei Lei

    (National Taiwan University)

  • Li-Min Wang

    (National Taiwan University)

  • Ping-Hui Lin

    (National Synchrotron Radiation Research Center)

  • Chih-Wei Luo

    (National Yang Ming Chiao Tung University)

  • Chun-Wei Chen

    (National Taiwan University (NTU-MST)
    Academia Sinica
    National Taiwan University)

  • Chia-Nung Kuo

    (National Cheng Kung University)

  • Chin Shan Lue

    (National Cheng Kung University
    National Science and Technology Council
    National Cheng Kung University)

  • Cheng-Hsuan Chen

    (National Taiwan University)

  • Hung-Chung Hsueh

    (Tamkang University)

  • Ming-Wen Chu

    (National Taiwan University
    National Taiwan University)

Abstract

Charge density waves (CDWs) are pervasive orders in solids that usually enhance the effective mass (m*) and reduce the Fermi velocity ( $${v}_{{{{\rm{F}}}}}$$ v F ) of carriers. Here, we report on the inverse — a reduced m* and an enhanced $${v}_{{{{\rm{F}}}}}$$ v F correlated with the growth of the CDW order in CuTe with gapped, practically linearly dispersing bands — reminiscent of emergent CDW-gapped topological semimetals. Using momentum-dependent electron energy-loss spectroscopy (q-EELS), we simultaneously capture m* and $${v}_{{{{\rm{F}}}}}$$ v F of the CDW-related, practically linearly dispersing electrons by plasmon dispersions across the transition (335 K, TCDW), with m* of 0.28 m0 (m0, the electron rest mass) and $${v}_{{{{\rm{F}}}}}$$ v F of ~ 0.005c (c, the speed of light) at 300 K. With the growth of the CDW order-parameter strength toward 100 K, the electrons become lighter and move faster by ~ 20%. Thorough inspection below TCDW unveils the essential role of the increasing opening of the CDW gap. CuTe is a rich platform for the exploration of CDW/correlation physics with q-EELS established as a useful probe for this type of physics.

Suggested Citation

  • I-Ta Wang & Ta-Lei Chou & Chih-En Hsu & Zhujialei Lei & Li-Min Wang & Ping-Hui Lin & Chih-Wei Luo & Chun-Wei Chen & Chia-Nung Kuo & Chin Shan Lue & Cheng-Hsuan Chen & Hung-Chung Hsueh & Ming-Wen Chu, 2024. "The growing charge-density-wave order in CuTe lightens and speeds up electrons," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-53653-z
    DOI: 10.1038/s41467-024-53653-z
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    References listed on IDEAS

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    1. J. Gooth & B. Bradlyn & S. Honnali & C. Schindler & N. Kumar & J. Noky & Y. Qi & C. Shekhar & Y. Sun & Z. Wang & B. A. Bernevig & C. Felser, 2019. "Axionic charge-density wave in the Weyl semimetal (TaSe4)2I," Nature, Nature, vol. 575(7782), pages 315-319, November.
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