Determination of 2DEG parameters in LED heterostructures with three quantum wells In-=SUB=-x-=/SUB=-Ga-=SUB=-1-x-=/SUB=-N/GaN by terahertz time-domain spectroscopy (THz-TDs)

IF 0.9 4区物理与天体物理 Q4 PHYSICS, CONDENSED MATTER

Physics of the Solid State Pub Date : 2023-01-01 DOI:10.21883/pss.2023.02.55399.503

Burmistrov E. R., Avakyants L. P.

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Abstract

Terahertz time-domain spectroscopy (THz-TDs) has been used to record the resonant frequencies of plasmon oscillations excited in samples of heterostructures with three InxGa1-xN/GaN quantum wells (QWs) by laser pulses with a duration of 130 fs in the temperature range from 90 to 170 K. Fast Fourier transform (FFT) of the time dependence of the electric field of THz-pulses made it possible to obtain the frequency spectra of the power and phase shift of THz-radiation, the interpretation of which made it possible to estimate the pulse relaxation time, mobility and effective mass of two-dimensional electron gas (2DEG) in the heterostructures. Using a series of frequency spectra of the power and phase shift of THz-radiation, the temperature dependences of the effective mass and relaxation time of the 2DEG pulse were obtained. Mobility value 2DEG obtained by the THz-TDs is in good agreement with the data of Hall measurements. Keywords: heterostructures, pulse relaxation time, 2DEG, terahertz radiation, terahertz spectroscopy.

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三量子阱in -=SUB=-x-=/SUB=- ga -=SUB=-1-x-=/SUB=- n /GaN的LED异质结构中2DEG参数的太赫兹时域光谱测定

用太赫兹时域光谱(THz-TDs)记录了在90 ~ 170 K温度范围内，持续时间为130 fs的激光脉冲在具有三个InxGa1-xN/GaN量子阱(QWs)的异质结构样品中激发等离子激元振荡的共振频率。对太赫兹脉冲电场的时间依赖性进行快速傅里叶变换(FFT)，可以获得太赫兹辐射功率和相移的频谱，对其进行解释，可以估计异质结构中二维电子气体(2DEG)的脉冲弛豫时间、迁移率和有效质量。利用太赫兹辐射的功率和相移的一系列频谱，得到了2DEG脉冲的有效质量和弛豫时间与温度的关系。thz - td得到的迁移率值2DEG与霍尔测量数据吻合较好。关键词:异质结构，脉冲弛豫时间，2DEG，太赫兹辐射，太赫兹光谱。

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来源期刊

Physics of the Solid State 物理-物理：凝聚态物理

CiteScore

1.70

自引率

0.00%

发文量

审稿时长

2-4 weeks

期刊介绍： Presents the latest results from Russia’s leading researchers in condensed matter physics at the Russian Academy of Sciences and other prestigious institutions. Covers all areas of solid state physics including solid state optics, solid state acoustics, electronic and vibrational spectra, phase transitions, ferroelectricity, magnetism, and superconductivity. Also presents review papers on the most important problems in solid state physics.