在[110]方向应力作用下,L-谷分裂诱导的 Ge 纳米线光增益变化

IF 2.3 4区 物理与天体物理 Q3 PHYSICS, APPLIED Applied Physics Express Pub Date : 2024-01-24 DOI:10.35848/1882-0786/ad1db6
Xin Li, Ning Hou and Wen Xiong
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引用次数: 0

摘要

通过有效质量k-p理论计算了[110]方向应力作用下Ge纳米线的电子结构,结果表明八个等效L-valleys将被分成四重退化的L1-valleys和L2-valleys。随着应力的增加,L1-valleys 和 L2-valleys的电子水平会分别向Γ谷靠近和远离Γ谷,从而导致Γ谷填充率和增益峰强度在应力为 2.5 GPa 左右时出现上升拐点。此外,我们还证明,考虑到自由载流子吸收损耗,小直径的正净增益峰值是很容易获得的。
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The optical gain variation of Ge nanowires induced by L-valley splitting under the [110] direction stress
The electronic structures of Ge nanowires under the [110] direction stress are calculated via effective-mass k·p theory, and the results manifest eight equivalent L-valleys will be split into fourfold degenerate L1-valleys and L2-valleys. With increasing stress, the electron levels at the L1-valleys and L2-valleys can be pushed close to and away from those at the Γ-valley, respectively, which causes the appearance of a rising inflection point in the Γ-valley filling ratio and gain peak intensity at around 2.5 GPa stress. Moreover, we prove the positive net peak gain with small diameters is apt to be obtained considering the free-carrier absorption loss.
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来源期刊
Applied Physics Express
Applied Physics Express 物理-物理:应用
CiteScore
4.80
自引率
8.70%
发文量
310
审稿时长
1.2 months
期刊介绍: Applied Physics Express (APEX) is a letters journal devoted solely to rapid dissemination of up-to-date and concise reports on new findings in applied physics. The motto of APEX is high scientific quality and prompt publication. APEX is a sister journal of the Japanese Journal of Applied Physics (JJAP) and is published by IOP Publishing Ltd on behalf of the Japan Society of Applied Physics (JSAP).
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