共查询到19条相似文献,搜索用时 31 毫秒
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在有效质量近似下,分析了GaAs/GaAlAs量子阱结构中有限深势阱(FPB)和理想的无限深势阱(IPB)的粒子的基态能级,得到零电场下等效宽度与阱真实宽度之间的显式表达式,发现结果与前人的数据吻合得很好,进一步的分析表明,该公式在非零电场下仍然适用,并从波函数角度进行了论证。 相似文献
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一维超晶格的子能带和光跃迁 总被引:1,自引:0,他引:1
用有效质量理论讨论了无限势阱和有限势阱中一维量子阱和超晶格的子能带和光跃迁.计算了势阶宽度W_x和W_y不同比值下,无限势阱中空穴的无量纲量子能级以及有限势阱中的两组空穴子带.讨论了准—维情形(W_x《W_y)和一维情形(W_x≈W_y)下量子能级的性质和光跃迁的选择规律. 相似文献
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本文采用Kronig-Penney模型及无限深势阱等效法对方势阱结构的子带能级及其Stark效应进行了理论推导和数值计算,并与其它近似法作了比较,实验上,研究了GaAs/AlGaAs方阱结构的子带吸收及其Stark效应分析了实验结构。 相似文献
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在包络波函数近似下自洽计算了非对称双势垒结构(DBS)中的电子态,并正确得到了积累区和中央势阶中准束缚能级Eac、Ewe随偏压变化的反交叉过程.结果首次揭示了如果适当选取DBS的入射垒厚度,随着外加电场不断增加,在过共振区积累层势阱和中央势阱会统一成一个大三角势阱的基态能级Ecom,Ecom具有很好的二维性,这表明在过共振区DBS在入射端积累区中只存在二维电子. 相似文献
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耦合量子阱和超晶格中的Stark效应及电场感生的局域化 总被引:1,自引:0,他引:1
薛舫时 《固体电子学研究与进展》1990,10(3):262-270
本文使用单带双谷模型和隧道谐振方法计算了电场作用下耦合量子阱和超晶格中的电子态.计算中考虑了能谷的非抛物线性和Г,Х两个能谷的贡献.算得的耦合量子阱能级同实验结果之间吻合良好,并且得出在某些电场下两个阱中的不同能级之间可能产生耦合.对超晶格的计算同样得到了同实验吻合的电场作用下的局域化及电子的带间跃迁能量.在GaAs/AlAs超晶格中还算得了适当电场下的有趣的Г-Х混和现象. 相似文献
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从玻尔 -索末菲量子化条件出发 ,以抛物线势阱为模型 ,建立了硅 MOS结构表面反型层中二维电子气能级 E满足的超越方程 ,并从该方程得到了能级 E的解析表达式。该式能够非常简单地确定出抛物线型势阱中的能级 ,而不需要数值求解薛定谔方程 相似文献
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采用球壳结构和渐变有限深谐振子势阱模型,利用镜像电荷的方法分析了不同介电常数下,界面效应对半导体量子点异质结中类氢杂质电子束缚能级的扰动情况.通过计算考虑到杂质对电子的束缚作用前后的电子的基态能,可以看出对于处在弱受限情况下的量子点,异质结厚度在小于10 nm时,界面效应对类氢杂质电子束缚能级的影响明显.当异质结壳层厚度增大的时候,界面效应的影响将逐渐减弱,受扰动的基态能也逐渐减小,最后不同Airy函数零点值所对应的基态能趋向于某一固定值,此时界面效应可以忽略. 相似文献
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采用包络函数方法在四带k·p模型基础上计算了晶格匹配的量子阱 InP/Ca_(0.47)In_(0.53)As/InP中束缚电子能级及波函数,讨论了表面势垒层厚度对量子阱中束缚电子能级、波函数以及相应于电子基态能级与重空穴基态能级间的荧光谱峰位置的影响.文中也讨论了在势阱与势垒边界处的不同衔接条件对量子阱中束缚电子能级计算结果的影响. 相似文献
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《Microwave Theory and Techniques》1957,5(3):174-174
We are all indebted to Ted Saad for his three years of tireless work as editor of our magazine. It does not take more than a brief glance through these pages to see what an exhausting time-consuming job it must be to both edit and coordinate the material for such a highly technical and valuable publication. 相似文献
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量子阱参数如势阱宽度、势垒高度和阱中的掺杂浓度决定了阱中的能级分布及光学吸收,它和量子阱红外探测器(QWIP)的响应波长、暗电流、响应率、探测率等特性参数密切相关.为了使设计的QWIP达到预期的各种性能指标,对其各参量进行了精心设计.运用量子阱的第一激发态与势垒的高度接近时产生共振效应,进行了量子阱的优化设计,得出垒高和阱宽的关系.另外,根据器件光谱响应的要求,利用传输矩阵法计算出相应的量子阱参数.此设计方法在GaAs/AlGaAs长波-长波双色QWIP中得到了较好的验证. 相似文献
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Liu H C Luo H Ban D Wachter M Song C Y Wasilewski Z R Buchanan M Aers G C SpringThorpe A J Cao J C Feng S L Williams B S Hu Q 《半导体学报》2006,27(4):627-634
For eventually providing terahertz science with compact and convenient devices,terahertz (1~10THz) quantum-well photodetectors and quantum-cascade lasers are investigated. The design and projected detector performance are presented together with experimental results for several test devices,all working at photon energies below and around optical phonons. Background limited infrared performance (BLIP) operations are observed for all samples (three in total) ,designed for different wavelengths. BLIP temperatures of 17,13, and 12K are achieved for peak detection frequencies of 9.7THz(31μm) ,5.4THz(56μm) ,and 3.2THz(93μm) ,respectively. A set of THz quantum-cascade lasers with identical device parameters except for doping concentration is studied. The δ-doping density for each period varies from 3.2 × 1010 to 4. 8 × 1010cm-2. We observe that the lasing threshold current density increases monotonically with doping concentration. Moreover, the measurements for devices with different cavity lengths provide evidence that the free carrier absorption causes the waveguide loss also to increase monotonically. Interestingly the observed maximum lasing temperature is best at a doping density of 3.6 × 1010cm-2. 相似文献
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Liu H C Luo H Ban D Wchter M Song C Y Wasilewski Z R Buchanan M Aers G C SpringThorpe A J Cao J C Feng S L Williams B S Hu Q 《半导体学报》2006,27(4)
For eventually providing terahertz science with compact and convenient devices,terahertz (1~10THz) quantum-well photodetectors and quantum-cascade lasers are investigated. The design and projected detector performance are presented together with experimental results for several test devices,all working at photon energies below and around optical phonons. Background limited infrared performance (BLIP) operations are observed for all samples (three in total) ,designed for different wavelengths. BLIP temperatures of 17,13, and 12K are achieved for peak detection frequencies of 9.7THz(31μm) ,5.4THz(56μm) ,and 3.2THz(93μm) ,respectively. A set of THz quantum-cascade lasers with identical device parameters except for doping concentration is studied. The δ-doping density for each period varies from 3.2 × 1010 to 4. 8 × 1010cm-2. We observe that the lasing threshold current density increases monotonically with doping concentration. Moreover, the measurements for devices with different cavity lengths provide evidence that the free carrier absorption causes the waveguide loss also to increase monotonically. Interestingly the observed maximum lasing temperature is best at a doping density of 3.6 × 1010cm-2. 相似文献