| アイテムタイプ |
学術雑誌論文 / Journal Article(1) |
| 公開日 |
2024-08-08 |
| タイトル |
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タイトル |
Enhancement of valley selective excitation by a linearly polarized two-color laser pulse |
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言語 |
en |
| 言語 |
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言語 |
eng |
| 資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
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資源タイプ |
journal article |
| 著者 |
Arqum Hashmi
Otobe Tomohito
Yamada Shunsuke
Yabana Kazuhiro
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| 抄録 |
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内容記述タイプ |
Abstract |
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内容記述 |
Here we proposed the valley selective excitations via a two-color (ω + 2ω) laser ?eld, made by superimposing two linearly polarized pulses at frequencies ω and 2ω. We have studied the intensity ratio between a few-cycle pulse of ω and 2ω laser, and its enhancement factor by employing the time-dependent ?first-principle calculations. The valley polarization depends on the carrier envelope phases (CEPs) of pulses and the intensity ratio Iω/I2ω. We found that the two-color ?field enhances the valley polarization as much as 1.2 times larger than the single-color pulse. The maximum valley asymmetry is achieved for the intensity ratio Iω/I2ω of 36. In our previous work, we found that the asymmetric vector potential induces the valley polarization (Phys. Rev. B 105,115403 (2022)). In this work, we ?found that the asymmetry of the electric ?field modulates the valley polarization. Our two-color scheme offers a new path toward the optical control of valley pseudospins. |
| 書誌情報 |
Physical Review B
巻 107,
号 23,
p. 235403-1-235403-9,
発行日 2023-06
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| 出版者 |
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出版者 |
アメリカ物理学会 |
| ISSN |
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収録物識別子タイプ |
ISSN |
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収録物識別子 |
2469-9950 |
| DOI |
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識別子タイプ |
DOI |
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関連識別子 |
10.1103/PhysRevB.107.235403 |
