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The interband magnetoreflection spectra of n-type Pb_(1-x)Sn_xTe single crystals have beenstudied for the first time for alloy composition x= 0.2 in temperature range 10-50 K with Fa-raday configuration which is induced by CW CO_s laser.The peak positions correspond totransitions from Landau levels in the L_1~6 valence band to the L_3~(6') conduction band. The peak positions are fit for the transition energies calculated using the model of R· pperturbation theory. The band parameters such as...

The interband magnetoreflection spectra of n-type Pb_(1-x)Sn_xTe single crystals have beenstudied for the first time for alloy composition x= 0.2 in temperature range 10-50 K with Fa-raday configuration which is induced by CW CO_s laser.The peak positions correspond totransitions from Landau levels in the L_1~6 valence band to the L_3~(6') conduction band. The peak positions are fit for the transition energies calculated using the model of R· pperturbation theory. The band parameters such as band-edge effective mass,g factor, aniso-tropy factor and energy gap have been obtained.It is found that the contribution of far-bandsto effective mass is considerable,and larger than that to g factor especially for longitudinaleffective mass,which would be as large as 30%.The conduction-valence bands symmetry is des-troyed and anisotropy factor is decreased, which is about 10 for x=0.2 due to far bands in-teraction.

用选支连续CO_2激光器为光源,首次对x=0.2 组分的n型Pb_(1-x)Sn_xTe 单晶进行了法拉第构象下圆偏振光的磁光反射光谱的测量.样品温度在10—50K范围内,磁光反射谱的振荡峰值对应L_1~6价带到L_3~(6')导带朗道能级间的跃迁. 采用k·p微扰理论模型,用上述峰位,经过拟合计算得到了该模型下此x值处能带边有效质量、g因子、各向异性因子、能隙等参数.结果发现,远带对有效质量贡献较大,特别是对纵向有效质量的贡献可达到30%,并带来一定程度的导带、价带不对称.相比之下,远带对g因子则影响很小.x=0.2时各向异性因子为10的量级,并随能隙而变化,远带作用使它有所降低.

 
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