Mobility and conductivity of laser-generated e-h plasmas in direct-gap nanowires

IF 2.5 3区 物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Photonics and Nanostructures-Fundamentals and Applications Pub Date : 2024-04-07 DOI:10.1016/j.photonics.2024.101259
Jeremy R. Gulley, Rachel Cooper, Ethan Winchester
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Abstract

This article examines the role of field strength, frequency, and many-body scattering during the ultrafast optoelectronic response in a direct-gap semiconductor nanowire using numerical simulation. Following resonant laser excitation, an AC or bias DC field perturbs the 1D e-h plasma as it relaxes by carrier-phonon and Coulomb scattering. For bias DC fields, the laser-excited carrier distributions evolve to a static non-equilibrium from which a stable DC mobility is calculated. Carrier-phonon collisions contain the e-h carriers near energy minima for fields of 0.5 kV/cm or less, while the Coulomb collisions redistribute some electrons across the Brillouin zone where they drift into other band structure energy minima and are there contained by phonon scattering. This behavior results in carrier mobilities with a field-strength dependence specific to a 1D solid. For AC probe fields, the analyze the resulting frequency-dependent conductivity for frequencies between the plasmon frequency and interband resonance. In all cases, we compare results to standard-conductivity models by calculating distribution-averaged collision rates and times, and show how, unlike in the bulk, these quantities for the nanowire are strongly dependent on both field magnitude and frequency.

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直接隙纳米线中激光产生的电子-氢等离子体的迁移率和导电性
本文通过数值模拟研究了场强、频率和多体散射在直接隙半导体纳米线超快光电响应过程中的作用。共振激光激发后,交流或偏置直流电场会扰动一维电子等离子体,使其通过载流子-声子和库仑散射发生弛豫。对于偏置直流电场,激光激发的载流子分布演变为静态非平衡,并由此计算出稳定的直流迁移率。在 0.5 kV/cm 或更小的电场中,载流子-声子碰撞将电子-载流子控制在能量极小值附近,而库仑碰撞则将一些电子重新分配到布里渊区,在那里它们漂移到其他带状结构能量极小值,并被声子散射所控制。这种行为导致载流子迁移率与一维固体特有的场强相关性。对于交流探针场,我们分析了等离子频率和带间共振频率之间随频率变化的电导率。在所有情况下,我们通过计算分布平均碰撞率和碰撞时间,将结果与标准电导率模型进行比较,并展示了纳米线的这些量如何与块体不同,强烈依赖于场的大小和频率。
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来源期刊
CiteScore
5.00
自引率
3.70%
发文量
77
审稿时长
62 days
期刊介绍: This journal establishes a dedicated channel for physicists, material scientists, chemists, engineers and computer scientists who are interested in photonics and nanostructures, and especially in research related to photonic crystals, photonic band gaps and metamaterials. The Journal sheds light on the latest developments in this growing field of science that will see the emergence of faster telecommunications and ultimately computers that use light instead of electrons to connect components.
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