| Observation of Shubnikov-de Haas Oscillations in Large-Scale Weyl Semimetai WTe2 Films |
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| 作者姓名： | 陈业全 陈勇达 宁纪爱 陈立明 庄文卓 何亮 张荣 徐永兵 王学锋 |
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| 作者单位： | Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials |
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| 基金项目： | the National Key R&D Program of China(Grant Nos.2017YFA0206304 and 2016YFA0300803);the National Natural Science Foundation of China(Grant Nos 61822403,11874203,11774160,61427812 and U1732159);the Fundamental Research Funds for the Central Universities(Grant Nos 021014380080 and 021014380113);the Natural Science Foundation of Jiangsu Province of China(Grant No BK20192006);Collaborative Innovation Center of Solid-State Lighting and Energy-Saving Elec tronics. |
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| 摘 要： | Topological Weyl semimetal WTe2 with large-scale Him form has a promising prospect for new-generation spintronic devices.However,it remains a hard task to suppress the defect states in large-scale WTe2 films due to the chemical nature.Here we significantly improve the crystalline quality and remove the Te vacancies in WTe2 films by post annealing.We observe the distinct Shubnikov-de Haas quantum oscillations in WTe2 films.The nontrivial Berry phase can be revealed by Landau fan diagram analysis.The Hall mobility of WTe2 films can reach 1245cm^2V^-1s^-1 and 1423cm^2V^-1s^-1 for holes and electrons with the carrier density of 5× 10^19 cm^-3 and 2 × 10^19 cm^-3,respectively.Our work provides a feasible route to obtain high-quality Weyl semimetal films for the future topological quantum device applications.
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| 关 键 词： | QUANTUM nontrivial REMOVE |
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