excitons;
nonlinear optical response;
spin Hall effect;
2ND-HARMONIC GENERATION;
OPTICAL-SPECTRA;
D O I:
10.1088/2053-1583/ab4171
中图分类号:
T [工业技术];
学科分类号:
08 ;
摘要:
We propose and analyze a mechanism for inducing spin Hall currents in ordinary (1H phase) monolayer transition metal dichalcogenides (TMDs) due to the nonlinear process of optical rectification. The photo-induced spin current is proportional to the light intensity, and originates from the intrinsic spin-orbit coupling in TMDs. The spin current spectrum is strongly influenced by electron-hole interactions, i.e. excitonic effects, analogous to the optical absorption. Remarkably, excitons change the temperature dependence of the induced spin current, to the point that the current direction can even be reversed by varying the temperature. This peculiar excitonic behavior is shown to emerge from the relative strength of two distinct mechanisms contributing to the optical response, i.e. a purely interband part and a mixed inter/intraband contribution. Our findings pave the path to the generation of dc spin currents in ordinary TMDs without external static electric or magnetic fields.
机构:
CUNY City Coll, Brooklyn, NY 11210 USA
CUNY, Grad Sch, New York, NY USA
CUNY, Univ Ctr, New York, NY 10021 USACUNY City Coll, Brooklyn, NY 11210 USA
Kezerashvili, Roman Ya
Tsiklauri, Shalva M.
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机构:
CUNY, Borough Manhattan Community Coll, New York, NY 10021 USACUNY City Coll, Brooklyn, NY 11210 USA
机构:
Peking Univ, Sch Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R ChinaPeking Univ, Sch Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China
Ding, Dongdong
Qu, Zhuangzhuang
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机构:
Peking Univ, Sch Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R ChinaPeking Univ, Sch Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China
Qu, Zhuangzhuang
Han, Xiangyan
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机构:
Peking Univ, Sch Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R ChinaPeking Univ, Sch Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China
Han, Xiangyan
Han, Chunrui
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机构:
Chinese Acad Sci, Inst Microelect, Beijing 100029, Peoples R China
Univ Chinese Acad Sci, Beijing 100049, Peoples R ChinaPeking Univ, Sch Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China
Han, Chunrui
Zhuang, Quan
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机构:
Southern Univ Sci & Technol, Shenzhen Inst Quantum Sci & Engn SIQSE, Shenzhen 518055, Peoples R China
Inner Mongolia Minzu Univ, Nano Innovat Inst NII, Inner Mongolia Key Lab Carbon Nanomat, Tongliao 028000, Peoples R ChinaPeking Univ, Sch Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China
Zhuang, Quan
Yu, Xiang-Long
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机构:Peking Univ, Sch Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China
Yu, Xiang-Long
Niu, Ruirui
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Peking Univ, Sch Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R ChinaPeking Univ, Sch Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China
Niu, Ruirui
Wang, Zhiyu
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机构:
Peking Univ, Sch Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R ChinaPeking Univ, Sch Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China
Wang, Zhiyu
Li, Zhuoxian
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机构:
Peking Univ, Sch Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R ChinaPeking Univ, Sch Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China
Li, Zhuoxian
Gan, Zizhao
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机构:
Peking Univ, Sch Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R ChinaPeking Univ, Sch Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China
Gan, Zizhao
Wu, Jiansheng
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机构:
Southern Univ Sci & Technol, Shenzhen Inst Quantum Sci & Engn SIQSE, Shenzhen 518055, Peoples R China
Int Quantum Acad, Shenzhen 518048, Peoples R ChinaPeking Univ, Sch Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China
Wu, Jiansheng
Lu, Jianming
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机构:
Peking Univ, Sch Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R ChinaPeking Univ, Sch Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China