Magnetotransport in p-type Ge quantum well narrow wire arrays

Magnetotransport in p-type Ge quantum well narrow wire arrays
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p型Ge量子阱窄线阵列中的磁输运

DOI:
10.1063/1.4919053
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发表时间:
2015
影响因子:
4
通讯作者:
Newton P
Newton P
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Newton P

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我们报告了包含 20nm p-Ge 量子阱的 SiGe 异质结构的磁输运测量,迁移率为 800 000 cm{sup 2} V{sup -1} s{sup -1}。通过干法刻蚀宽度在1.0μm到3.0μm之间的导线阵列,我们能够测量量子阱的横向耗尽厚度、内建电势和相位相干长度。尽管在 ν = 22 的填充因子下观察到了明确定义的 Shubnikov-de Haas 振荡,但傅里叶分析并未显示任何 Rashba 相关的自旋分裂。对于低于 ν = 9 的填充因子,观察到交换增强的自旋分裂。边界散射效应分析表明,孔气体的横向耗尽距离蚀刻为 0.5 ±0.1 μm锗表面。发现内建电势为 0.25±0.04V,横向传输的能垒大于空穴限制能。这些导线在 1.7K 时获得了 3.5±0.5μm 的大相位相干长度。
We report magnetotransport measurements of a SiGe heterostructure containing a 20 nm p-Ge quantum well with a mobility of 800 000 cm{sup 2} V{sup −1} s{sup −1}. By dry etching arrays of wires with widths between 1.0 μm and 3.0 μm, we were able to measure the lateral depletion thickness, built-in potential, and the phase coherence length of the quantum well. Fourier analysis does not show any Rashba related spin-splitting despite clearly defined Shubnikov-de Haas oscillations being observed up to a filling factor of ν = 22. Exchange-enhanced spin-splitting is observed for filling factors below ν = 9. An analysis of boundary scattering effects indicates lateral depletion of the hole gas by 0.5 ± 0.1 μm from the etched germanium surface. The built-in potential is found to be 0.25 ± 0.04 V, presenting an energy barrier for lateral transport greater than the hole confinement energy. A large phase coherence length of 3.5 ± 0.5 μm is obtained in these wires at 1.7 K.
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