摘要
运用Larsen的微扰方法,研究纤锌矿Al_(y)Ga_(1-y)N/Al_(x)Ga_(1-x)N三角量子阱与GaN/Al_(x)Ga_(1-x)N方量子阱中磁极化子回旋频率与回旋质量随流体静压力、外磁场强度及组分的变化关系。在理论推导中,计入声子频率、介电常数、电子有效质量对压力P和坐标z的依赖性,并考虑其各向异性。结果显示,在外磁场强度不变的情况下,随着流体静压力的增加,在纤锌矿Al_(y)Ga_(1-y)N/Al_(0.3)Ga_(0.7)N三角量子阱与GaN/Al_(0.3)Ga_(0.7)N方量子阱中磁极化子回旋频率逐渐减小,回旋质量逐渐增大。在纤锌矿Al_(y)Ga_(1-y)N/Al_(0.3)Ga_(0.7)N三角量子阱与GaN/Al_(0.3)Ga_(0.7)N方量子阱(压力为定值)中,磁极化子回旋频率随外磁场强度的增大而增大;三角阱(方阱)中的磁极化子回旋质量随外磁场强度的增大逐渐增大。当组分作为变量时,随着组分的变化,Al_(y)Ga_(1-y)N/Al_(x)Ga_(1-x)N三角阱中磁极化子的回旋频率与回旋质量变化较大而GaN/Al_(x)Ga_(1-x)N方阱中的变化较小。Al_(y)Ga_(1-y)N/Al_(x)Ga_(1-x)N三角量子阱中的磁极化子回旋频率比GaN/Al_(x)Ga_(1-x)N方量子阱中的小,而三角量子阱中的磁极化子回旋质量比方量子阱中的大。
Larsen’s perturbation method was used to study the change of magnetopolaron cyclotron frequency and cyclotron mass with hydrostatic pressure,external magnetic field intensity and compositions in Al_(y)Ga_(1-y)N/Al_(x)Ga_(1-x)Ntriangle quantum well(QW)and GaN/Al_(x)Ga_(1-x)N square QW.The dependence of phonon frequency,dielectric constant,electron effective mass on pressure P and coordinate z were taken into account in the theoretical derivation,and their anisotropy were considered.The results showed that the magnetopolaron cyclotron frequency decreased and the cyclotron mass increased with the increase of hydrostatic pressure in wurtzite Al_(y)Ga_(1-y)N/Al_(0.3)Ga_(0.7)N triangle QW and GaN/Al_(0.3)Ga_(0.7)N square QW under the constant external magnetic field intensity.With the increase of external magnetic field intensity,cyclotron frequency and cyclotron mass of magnetopolaron increased gradually in wurtzite Al_(y)Ga_(1-y)N/Al_(0.3)Ga_(0.7)N triangle QW and GaN/Al_(0.3)Ga_(0.7)N square QW(pressure is a fixed value).When the composition was a variable,the cyclotron frequency and the cyclotron mass of the magnetopolaron in the Al_(y)Ga_(1-y)N/Al_(x)Ga_(1-x)N triangle QW changed greatly while the changes in the GaN/Al_(x)Ga_(1-x)N square QW were smaller with the increase of the composition.The cyclotron frequency of the magnetopolaron in Al_(y)Ga_(1-y)N/Al_(x)Ga_(1-x)N triangle QW was smaller than that of the magnetopolaron in GaN/Al_(x)Ga_(1-x)N square QW,and the magnetopolaron in triangle QW had a larger cyclotron mass than that in square QW.
作者
赵博
赵凤岐
ZHAO Bo;ZHAO Feng-qi(College of Physics and Electronic Information,Inner Mongolia Normal University,Hohhot 010022,China)
出处
《内蒙古师范大学学报（自然科学版）》
CAS
2021年第3期189-196,共8页
Journal of Inner Mongolia Normal University(Natural Science Edition)
基金
国家自然科学基金资助项目(11664031,11264027)。
关键词
三角量子阱
流体静压力
磁极化子
回旋频率
triangular quantum well
hydrostatic pressure
magnetopolaron
cyclotron frequency
