arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1211.2018cond-mat.str-elcond-mat.mes-hallquant-ph
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二维电子气中相互作用诱导的交错自旋轨道序

Interaction induced staggered spin-orbit order in two-dimensional electron gas

Tanmoy Das

摘要:

我们提出并表述了相互作用诱导的交错自旋轨道序作为二维费米气体的一种新的涌现相。我们表明,当某种形式的内在自旋分裂通过Rashba型自旋轨道耦合呈现两个螺旋费米面成为显着的“嵌套”,费米面不稳定性出现。为了解除这种简并,一个自发对称性破缺自旋轨道密度波的发展,导致一个令人惊讶的大准粒子手征电子态的间隙。由于交错的自旋-轨道阶与由间隙值量化的凝聚能相关联,因此破坏这种自旋-轨道相互作用需要足够大的扰动场或温度或退相时间。BiAg $_2$表面态是实现这种新型自旋轨道相互作用的一个代表性系统,具有可调和大的强度,并且自旋分裂与电荷激发是解耦的。这些功能特性与自旋电子学、自旋热电子学和自旋霍尔效应应用相关。

英文摘要:

We propose and formulate an interaction induced staggered spin-orbit order as a new emergent phase of two-dimensional Fermi gases. We show that when some form of inherent spin-splitting via Rashba-type spin-orbit coupling renders two helical Fermi surfaces to become significantly `nested', a Fermi surface instability arises. To lift this degeneracy, a spontaneous symmetry breaking spin-orbit density wave develops, causing a surprisingly large quasiparticle gapping with chiral electronic states. Since the staggered spin-orbit order is associated with a condensation energy, quantified by the gap value, destroying such spin-orbit interaction costs sufficiently large perturbation field or temperature or de-phasing time. BiAg$_2$ surface state is shown to be a representative system for realizing such novel spin-orbit interaction with tunable and large strength, and the spin-splitting is decoupled from charge excitations. These functional properties are relevant for spin-electronics, spin-caloritronics, and spin-Hall effect applications.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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