| Strain Tunable Berry Curvature Dipole,Orbital Magnetization and Nonlinear Hall Effect in WSe2 Monolayer |
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| 作者姓名： | 秦茂森 朱鹏飞 叶兴国 徐文正 宋振豪 梁晶 刘开辉 廖志敏 |
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| 作者单位： | State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics |
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| 基金项目： | Supported by the National Key Research and Development Program of China(Grant Nos.2018YFA0703703 and 2016YFA0300802);the National Natural Science Foundation of China(Grant Nos.91964201,61825401,and 11774004)。 |
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| 摘 要： | The electronic topology is generally related to the Berry curvature,which can induce the anomalous Hall effect in time-reversal symmetry breaking systems.Intrinsic monolayer transition metal dichalcogenides possesses two nonequivalent K and K’ valleys,having Berry curvatures with opposite signs,and thus vanishing anomalous Hall effect in this system.Here we report the experimental realization of asymmetrical distribution of Berry curvature in a single valley in monolayer WSe2 via applying uniaxial strain to break C3v symmetry.As a result,although the Berry curvature itself is still opposite in K and K’ valleys,the two valleys would contribute equally to nonzero Berry curvature dipole.Upon applying electric field E,the emergent Berry curvature dipole D would lead to an out-of-plane orbital magnetization M ∝ D·E,which further induces an anomalous Hall effect with a linear response to E2,known as nonlinear Hall effect.We show the strain modulated transport properties of nonlinear Hall effect in monolayer WSe2 with moderate hole-doping by gating.The second-harmonic Hall signals show quadratic dependence on electric field,and the corresponding orbital magnetization per current density M/J can reach as large as 60.In contrast to the conventional Rashba-Edelstein effect with in-plane spin polarization,such current-induced orbital magnetization is along the out-of-plane direction,thus promising for high-efficient electrical switching of perpendicular magnetization.
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| 关 键 词： | BERRY CURVATURE MAGNETIZATION |
Strain Tunable Berry Curvature Dipole,Orbital Magnetization and Nonlinear Hall Effect in WSe_2 Monolayer |
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| Mao-Sen Qin,Peng-Fei Zhu,Xing-Guo Ye,Wen-Zheng Xu,Zhen-Hao Song,Jing Liang,Kaihui Liu,Zhi-Min Liao.Strain Tunable Berry Curvature Dipole,Orbital Magnetization and Nonlinear Hall Effect in WSe2 Monolayer[J].Chinese Physics Letters,2021(1):99-104. |
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| Authors: | Mao-Sen Qin Peng-Fei Zhu Xing-Guo Ye Wen-Zheng Xu Zhen-Hao Song Jing Liang Kaihui Liu Zhi-Min Liao |
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| Affiliation: | (State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics,School of Physics,Peking University,Beijing 100871,China) |
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