PIEZO-ELECTROREFLECTANCE IN GE GAAS AND SI
PIEZO-ELECTROREFLECTANCE IN GE GAAS AND SI
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DOI：
10.1103/physrev.172.816
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发表时间：
1968-01-01
期刊：
影响因子：
--
通讯作者：
CARDONA, M
中科院分区：
文献类型：
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作者：
POLLAK, FH;CARDONA, M
研究了静态单轴压缩沿着[001]、[110]和[111]方向对Ge和GaAs的E0、E0 + Δ 0、E1和E1 + Δ 1电反射峰以及Si的E0 ′电反射峰的影响。根据应力引起的Ge和GaAs的E0，E0 + Δ 0峰的分裂和位移，确定了k= 0价带顶的流体静力学和剪切形变势。我们还观察到这些峰的能量的非线性应力依赖性，这是由应力诱导的上应力分裂价带和自旋轨道分裂带之间的耦合。由这种相互作用引起的应力引起的强度变化的理论将被提出，并与实验结果进行比较。根据Ge和GaAs的E1和E1 + Δ 1峰的应力依赖性，确定了Ge和GaAs的Λ 1导带和Λ 3价带的流体静力学和剪切形变势。我们把观察到的应力引起的这些峰强度的变化归因于Λ 3轨道价带的带内分裂。实验结果与我们的理论计算进行了比较。Si的E0 ′电反射峰对[001]应力的依赖性似乎表明[100]临界点是这种结构的原因。然而，我们也观察到了[111]应力的大的偏振相关强度变化，这是我们无法根据上述任务解释的。
We have investigated the effect of static uniaxial compression along the [001],[110], and [111] directions on the E 0, E 0+ Δ 0, E 1, and E 1+ Δ 1 electroreflectance peaks of Ge and GaAs, and the E 0′ electroreflectance peaks of Si. From the stress-induced splittings and shifts of the E 0, E 0+ Δ 0 peaks of Ge and GaAs, the hydrostatic and shear deformation potentials of the k= 0 valence-band maximum have been determined. We have also observed a nonlinear stress dependence of the energies of these peaks, which is caused by the stress-induced coupling between the upper stress-split valence band and the spin-orbit split band. A theory for the stress-induced variations in intensity caused by this interaction will be presented and compared with the experimental results. The hydrostatic and shear deformation potentials of the Λ 1-conduction and Λ 3-valence bands of Ge and GaAs have been determined from the stress dependence of the E 1 and E 1+ Δ 1 peaks of these materials. We have attributed the observed stress-induced changes in intensity of these peaks to the intraband splitting of the Λ 3-orbital valence bands. The experimental results are compared with our theoretical calculations. The stress dependence of the E 0′ electroreflectance peaks of Si for [001] stress seems to indicate that [100] critical points are responsible for this structure. However, we have also observed large polarization-dependent intensity changes for [111] stress, which we have not been able to explain on the basis of the above assignment.