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Article: Nonlinear optics in the electron-hole continuum in 2D semiconductors: two-photon transition, second harmonic generation and valley current injection
Title | Nonlinear optics in the electron-hole continuum in 2D semiconductors: two-photon transition, second harmonic generation and valley current injection |
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Authors | |
Keywords | 2D semiconductors Nonlinear optics Electron-hole continuum Two-photon transition Second-harmonic generation |
Issue Date | 2019 |
Publisher | Elsevier B.V. and Science China Press. |
Citation | Science Bulletin, 2019, v. 64 n. 15, p. 1036-1043 How to Cite? |
Abstract | We investigate two-photon transitions to the electron-hole scattering continuum in monolayer transition-metal dichalcogenides, and identify two contributions to this nonlinear optical process with opposite circularly polarized valley selection rules. In the non-interacting limit, the competition between the two contributions leads to a crossover of the selection rule with the increase of the two-photon energy. With the strong Coulomb interaction between the electron and hole, the two contributions excite electron-hole scattering states in orthogonal angular momentum channels, while the strength of the transition can be substantially enhanced by the interaction. Based on this picture of the two-photon transition, the second harmonic generation (SHG) in the electron-hole continuum is analyzed, where the Coulomb interaction is shown to greatly alter the relative strength of different cross-circular polarized SHG processes. Valley current injection by the quantum interference of one-photon and two-photon transition is also investigated in the presence of the strong Coulomb interaction, which significantly enhances the injection rate. |
Persistent Identifier | http://hdl.handle.net/10722/277123 |
ISSN | 2023 Impact Factor: 18.8 2023 SCImago Journal Rankings: 2.807 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Gong, P | - |
dc.contributor.author | Yu, H | - |
dc.contributor.author | Wang, Y | - |
dc.contributor.author | Yao, W | - |
dc.date.accessioned | 2019-09-20T08:44:54Z | - |
dc.date.available | 2019-09-20T08:44:54Z | - |
dc.date.issued | 2019 | - |
dc.identifier.citation | Science Bulletin, 2019, v. 64 n. 15, p. 1036-1043 | - |
dc.identifier.issn | 2095-9273 | - |
dc.identifier.uri | http://hdl.handle.net/10722/277123 | - |
dc.description.abstract | We investigate two-photon transitions to the electron-hole scattering continuum in monolayer transition-metal dichalcogenides, and identify two contributions to this nonlinear optical process with opposite circularly polarized valley selection rules. In the non-interacting limit, the competition between the two contributions leads to a crossover of the selection rule with the increase of the two-photon energy. With the strong Coulomb interaction between the electron and hole, the two contributions excite electron-hole scattering states in orthogonal angular momentum channels, while the strength of the transition can be substantially enhanced by the interaction. Based on this picture of the two-photon transition, the second harmonic generation (SHG) in the electron-hole continuum is analyzed, where the Coulomb interaction is shown to greatly alter the relative strength of different cross-circular polarized SHG processes. Valley current injection by the quantum interference of one-photon and two-photon transition is also investigated in the presence of the strong Coulomb interaction, which significantly enhances the injection rate. | - |
dc.language | eng | - |
dc.publisher | Elsevier B.V. and Science China Press. | - |
dc.relation.ispartof | Science Bulletin | - |
dc.rights | This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. | - |
dc.subject | 2D semiconductors | - |
dc.subject | Nonlinear optics | - |
dc.subject | Electron-hole continuum | - |
dc.subject | Two-photon transition | - |
dc.subject | Second-harmonic generation | - |
dc.title | Nonlinear optics in the electron-hole continuum in 2D semiconductors: two-photon transition, second harmonic generation and valley current injection | - |
dc.type | Article | - |
dc.identifier.email | Yu, H: yuhongyi@hku.hk | - |
dc.identifier.email | Yao, W: wangyao@hku.hk | - |
dc.identifier.authority | Yu, H=rp02112 | - |
dc.identifier.authority | Yao, W=rp00827 | - |
dc.description.nature | postprint | - |
dc.identifier.doi | 10.1016/j.scib.2019.03.023 | - |
dc.identifier.scopus | eid_2-s2.0-85064088446 | - |
dc.identifier.hkuros | 305605 | - |
dc.identifier.volume | 64 | - |
dc.identifier.issue | 15 | - |
dc.identifier.spage | 1036 | - |
dc.identifier.epage | 1043 | - |
dc.identifier.isi | WOS:000483302600003 | - |
dc.publisher.place | United States | - |
dc.identifier.issnl | 2095-9273 | - |