期刊
STRUCTURAL DYNAMICS-US
卷 9, 期 1, 页码 -出版社
AIP Publishing
DOI: 10.1063/4.0000132
关键词
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资金
- National Science Foundation through the JILA Physics Frontiers Center [PHY-1734006]
- Gordon and Betty Moore Foundation EPiQS [GBMF4538]
- National Natural Science Foundation of China [11888101, 11674371]
- Ministry of Science and Technology of China [2016YFA0401000]
In this study, a novel inverted CDW state was discovered in 1T-TaSe2 by using a femtosecond laser to manipulate charge-lattice orders and couplings. The unique properties of this state, such as increased density of states, high metallicity, and altered electron-phonon couplings, were revealed through time- and angle-resolved photoemission spectroscopy and time-dependent density functional theory.
Charge density wave (CDW) order is an emergent quantum phase that is characterized by periodic lattice distortion and charge density modulation, often present near superconducting transitions. Here, we uncover a novel inverted CDW state by using a femtosecond laser to coherently reverse the star-of-David lattice distortion in 1T-TaSe2. We track the signature of this novel CDW state using time- and angle-resolved photoemission spectroscopy and the time-dependent density functional theory to validate that it is associated with a unique lattice and charge arrangement never before realized. The dynamic electronic structure further reveals its novel properties that are characterized by an increased density of states near the Fermi level, high metallicity, and altered electron-phonon couplings. Our results demonstrate how ultrafast lasers can be used to create unique states in materials by manipulating charge-lattice orders and couplings. (C) 2022 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
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