期刊
NEW JOURNAL OF PHYSICS
卷 22, 期 10, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/abbca5
关键词
plasmon; topological semimetal; high resolution electron energy loss spectroscopy
资金
- National Natural Science Foundation of China [11874404, 11634016]
- National Key R&D Program of China [2016YFA0302400, 2017YFA0303600, 2016YFA0300600]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDB30000000, XDB33000000]
- Youth Innovation Promotion Association of Chinese Academy of Sciences [2016008]
- BAQIS Research Program [Y18G09]
- Beijing Natural Science Foundation [Z180008]
- High Magnetic Field Laboratory of Anhui Province
In many realistic topological materials, more than one kind of fermions contribute to the electronic bands crossing the Fermi level, leading to various novel phenomena. Here, using momentum-resolved inelastic electron scattering, we investigate the plasmons and their evolution across the phase transition in a type-II Weyl semimetal MoTe2, in which both Weyl fermions and trivial electrons contribute to the Fermi surface in theT(d)phase. One plasmon mode in the 1T ' phase at high temperature and two plasmon modes in the topologicalT(d)phase at low temperature are observed. Combining with first-principles calculations, we show that all the plasmon modes are dominated by the interband correlations between the inverted bands of MoTe2. Especially in theT(d)phase, since the electronic bands split due to inversion symmetry breaking and spin-orbit coupling, the plasmon modes manifest the interband correlation between the topological Weyl fermions and the trivial electrons. Our work emphasizes the significance of the interplay between different kinds of carriers in plasmons of topological materials.
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