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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.
For the first time, the magneto-optical reflectivity spectra of circularly polarized light with Faraday’s conformation were measured for the n-type Pb_ (1-x) Sn_xTe single crystal with x = 0.2 by using continuous carbon dioxide laser as the light source. , The oscillation peak of magneto-optical reflection spectrum corresponds to the transition from L_1 ~ 6 valence band to the Londo band of L_3 ~ (6 ’) conduction band. Using the k · p perturbation theory model, The effective energy, g-factor, anisotropy factor, energy gap and other parameters of the energy band at this value of x are calculated and found that the far-band contributes more to the effective mass, especially the contribution to the effective mass in the longitudinal direction Up to 30%, and bring a certain degree of conduction band, the price band asymmetry.In contrast, the far zone has little effect on the g factor.X = 0.2 when the anisotropy factor is on the order of 10, Gap and change, the role of the far so that it has decreased.