応用光学 シリコンナノワイヤの電圧調整可能な円形光加熱効果
Sajal Dhara1, Eugene J Mele2, Ritesh Agarwal1
1Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA.
Science (New York, N.Y.)
|August 15, 2015
まとめ
研究者は,光のキラリティを使用してシリコンで光電流を生成する新しい方法を示しています. シリコンナノワイヤのこの円形の光電磁効果 (CPGE) は,新しい電子機能の可能性を秘めています.
科学分野:
- 凝縮物質物理学
- 材料科学
- ナノテクノロジー
背景:
- トポロジカルな電子帯構造は,スピン軌道相互作用から生じる.
- 純粋な軌道メカニズムは,スピン変性を破らずに類似のダイナミクスを達成し,軽元素の材料でのアプリケーションを可能にします.
- 円形光電効果 (CPGE) は,光学刺激のキラリティに依存する光電流を生成する.
研究 の 目的:
- シリコンナノワイヤでのCPGE生成を調査する.
- CPGEの純粋な軌道メカニズムを探求する.
- 電場とバイアス電圧を使用してCPGEの制御を実証する.
主な方法:
- シリコンナノワイヤへの金属接触におけるインターバンド移行の理論分析.
- 地元の逆対称性を破るための電場の適用.
- 電場を制御するためにバイアス電圧の調節.
主要な成果:
- CPGEは,シリコンナノワイヤの金属コンタクトでのインターバンドトランジションから生じることが示されています.
- 電気フィールドによる局所的な逆対称性破壊は,CPGE生成の鍵です.
- バイアス電圧は,CPGEのサインと大きさを効果的に制御します.
結論:
- 純粋な軌道メカニズムは,シリコンでキラリティに依存する光電流の生成を可能にします.
- このアプローチは,スピン変性破裂を回避し,軽い要素の材料に適しています.
- 発見は,新しいシリコンベースの機能を従来の電子機器と統合するための道を切り開きます.
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