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

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 () and Ming-Wen Chu ()
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I-Ta Wang: National Taiwan University
Ta-Lei Chou: 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)
Chia-Nung Kuo: National Cheng Kung University
Chin Shan Lue: National Cheng Kung University
Cheng-Hsuan Chen: National Taiwan University
Hung-Chung Hsueh: Tamkang University
Ming-Wen Chu: National Taiwan University

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-53653-z

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