Yim Chi Ming, Chakraborti Dibyashree, Rhodes Luke C, Khim Seunghyun, Mackenzie Andrew P, Wahl Peter
SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS, UK.
Tsung Dao Lee Institute and School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.
Sci Adv. 2021 Apr 9;7(15). doi: 10.1126/sciadv.abd7361. Print 2021 Apr.
Exploiting inversion symmetry breaking (ISB) in systems with strong spin-orbit coupling promises control of spin through electric fields-crucial to achieve miniaturization in spintronic devices. Delivering on this promise requires a two-dimensional electron gas with a spin precession length shorter than the spin coherence length and a large spin splitting so that spin manipulation can be achieved over length scales of nanometers. Recently, the transition metal oxide terminations of delafossite oxides were found to exhibit a large Rashba spin splitting dominated by ISB. In this limit, the Fermi surface exhibits the same spin texture as for weak ISB, but the orbital texture is completely different, raising questions about the effect on quasiparticle scattering. We demonstrate that the spin-orbital selection rules relevant for conventional Rashba system are obeyed as true spin selection rules in this correlated electron liquid and determine its spin coherence length from quasiparticle interference imaging.
在具有强自旋轨道耦合的系统中利用反演对称性破缺（ISB）有望通过电场控制自旋，这对于实现自旋电子器件的小型化至关重要。要实现这一前景，需要一种二维电子气，其自旋进动长度短于自旋相干长度且具有大的自旋分裂，以便能在纳米长度尺度上实现自旋操控。最近，发现铜铁矿氧化物的过渡金属氧化物表面表现出由ISB主导的大Rashba自旋分裂。在此极限下，费米面呈现出与弱ISB相同的自旋纹理，但轨道纹理却完全不同，这引发了关于对准粒子散射影响的问题。我们证明，在这种关联电子液体中，与传统Rashba系统相关的自旋 - 轨道选择规则作为真正的自旋选择规则得到遵守，并通过准粒子干涉成像确定其自旋相干长度。
