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Modulation induced transport signatures in correlated electron waveguides
SciPost Physics ( IF 5.5 ) Pub Date : 2020-10-14 , DOI: 10.21468/scipostphys.9.4.051
Gal Shavit 1 , Yuval Oreg 1
Affiliation  

Recent transport experiments in spatially modulated quasi-1D structures created on top of LaAlO$_3$/SrTiO$_3$ interfaces have revealed some interesting features, including phenomena conspicuously absent without the modulation. In this work, we focus on two of these remarkable features and provide theoretical analysis allowing their interpretation. The first one is the appearance of two-terminal conductance plateaus at rational fractions of $e^2/h$. We explain how this phenomenon, previously believed to be possible only in systems with strong repulsive interactions, can be stabilized in a system with attraction in the presence of the modulation. Using our theoretical framework we find the plateau amplitude and shape, and characterize the correlated phase which develops in the system due to the partial gap, namely a Luttinger liquid of electronic trions. The second observation is a sharp conductance dip below a conductance of $1\times e^2/h$, which changes its value over a wide range when tuning the system. We theorize that it is due to resonant backscattering caused by a periodic spin-orbit field. The behavior of this dip can be reliably accounted for by considering the finite length of the electronic waveguides, as well as the interactions therein. The phenomena discussed in this work exemplify the intricate interplay of strong interactions and spatial modulations, and reveal the potential for novel strongly correlated phases of matter in systems which prominently feature both.

中文翻译:

相关电子波导中调制诱导的传输特征

最近在LaAlO $ _3 $ / SrTiO $ _3 $界面之上创建的空间调制准1D结构中的传输实验揭示了一些有趣的功能,包括没有调制就明显不存在的现象。在这项工作中,我们将重点介绍这些显着特征中的两个,并提供理论分析以对其进行解释。第一个是在$ e ^ 2 / h $的有理分数处出现的两个末端电导平台。我们解释了以前认为仅在具有强烈排斥相互作用的系统中才可能发生的现象,如何在存在调制的情况下在具有吸引力的系统中使其稳定。使用我们的理论框架,我们可以找到平台的振幅和形状,并描述由于部分间隙而在系统中形成的相关相位,即电子tri子的Luttinger液体。第二个观察结果是电导值急剧下降,低于电导率$ 1 \ e ^ 2 / h $,这在调节系统时会在很宽的范围内改变其值。我们推论这是由于周期性自旋轨道场引起的共振反向散射。通过考虑电子波导的有限长度以及其中的相互作用,可以可靠地解决这种倾角的问题。在这项工作中讨论的现象例证了强相互作用和空间调制之间错综复杂的相互作用,并揭示了在这两个特征都突出的系统中,新的物质强相关阶段的潜力。我们推论这是由于周期性自旋轨道场引起的共振反向散射。通过考虑电子波导的有限长度以及其中的相互作用,可以可靠地解决这种倾角的问题。在这项工作中讨论的现象说明了强相互作用和空间调制之间错综复杂的相互作用,并揭示了在同时具有这两个特征的系统中,物质之间新的强相关阶段的潜力。我们推论这是由于周期性自旋轨道场引起的共振反向散射。通过考虑电子波导的有限长度以及其中的相互作用,可以可靠地解决这种倾角的问题。在这项工作中讨论的现象说明了强相互作用和空间调制之间错综复杂的相互作用,并揭示了在同时具有这两个特征的系统中,物质之间新的强相关阶段的潜力。
更新日期:2020-10-15
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