Ferroelectric control of Rashba spin orbit coupling at the GeTe(111)/InP(111) interface,Nanoscale

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Ferroelectric control of Rashba spin orbit coupling at the GeTe(111)/InP(111) interface
Nanoscale ( IF 5.8 ) Pub Date : 2017-10-25 00:00:00 , DOI: 10.1039/c7nr05550a
Yu-Hua Meng _{1,

2,

3,

4,

5} , Wei Bai _{1,

2,

3,

4,

5} , Heng Gao _{6,

7,

8,

9} , Shi-Jing Gong _{1,

2,

3,

4,

5} , Ji-Qing Wang _{1,

2,

3,

4,

5} , Chun-Gang Duan _{1,

2,

3,

4,

5} , Jun-Hao Chu _{1,

2,

3,

4,

5}

Affiliation

GeTe is a prototypical compound of a new class of multifunctional materials, i.e., ferroelectric Rashba semiconductors (FRS). In the present work, by combining the first-principles calculations and Rashba model analysis, we reexamine Rashba spin–orbit coupling (SOC) in a GeTe(111) crystal and clarify its linear Rashba SOC strength. We further investigate Rashba SOC at the interface of a GeTe(111)/InP(111) superlattice and demonstrate the ferroelectric manipulation of Rashba SOC in detail. A large modulation of Rashba SOC is obtained, and surprisingly, we find that Rashba SOC does not monotonically increase with the increase of ferroelectric displacement, due to the parabola opening reversal of Rashba splitting bands. In addition, a reversal of the spin texture is realized by tuning the ferroelectric polarization. Our investigation provides a deep insight into the ferroelectric control of Rashba SOC, which is of great importance in FRS spin field effect transistors.

中文翻译：

GeTe（111）/ InP（111）界面上Rashba自旋轨道耦合的铁电控制

GeTe是新型多功能材料的原型化合物，即，铁电Rashba半导体（FRS）。在当前的工作中，通过结合第一性原理计算和Rashba模型分析，我们重新检查了GeTe（111）晶体中的Rashba自旋-轨道耦合（SOC），并阐明了其线性Rashba SOC强度。我们进一步研究GeTe（111）/ InP（111）超晶格的界面处的Rashba SOC，并详细演示Rashba SOC的铁电操纵。获得了Rashba SOC的较大调制，并且令人惊讶地，我们发现，由于Rashba分裂带的抛物线开度反转，Rashba SOC不会随着铁电位移的增加而单调增加。另外，通过调节铁电极化来实现自旋纹理的反转。我们的研究为Rashba SOC的铁电控制提供了深刻的见解，

更新日期：2017-11-23

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