| Autor: |
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 |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
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| Zdroj: |
Nature Communications, Vol 15, Iss 1, Pp 1-9 (2024) |
| Druh dokumentu: |
article |
| ISSN: |
2041-1723 |
| DOI: |
10.1038/s41467-024-53653-z |
| Popis: |
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. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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