Tunneling Spectroscopy of Quantum Spin Liquids.
Tunneling Spectroscopy of Quantum Spin Liquids.
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量子自旋液体的隧道光谱。
DOI：
10.1103/physrevlett.125.267206
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发表时间：
2020
影响因子：
8.6
通讯作者：
Berthold Jäck
中科院分区：
文献类型：
--
作者：
E. König;M. Randeria;Berthold Jäck
我们研究的光谱签名隧道通过Kitaev量子自旋液体（QSL）的障碍，在一些实验相关的几何形状。我们结合联合收割机的弹性和非弹性隧穿过程的贡献，发现自旋翻转散射在巡回自旋模式引起的隧道电导谱的带隙的贡献。我们解决了在磁场中出现的光谱修改，施加磁场以驱动候选材料α-RuCl_{3}进入QSL相，并且我们提出横向1D隧道结作为这种机制的可行设置。特征自旋间隙是一个明确的签名的分数QSL激发，区分它从磁振子或声子。我们讨论了我们的结果的推广到各种各样的QSL与gapped和gapless自旋反转子。
We examine the spectroscopic signatures of tunneling through a Kitaev quantum spin liquid (QSL) barrier in a number of experimentally relevant geometries. We combine contributions from elastic and inelastic tunneling processes and find that spin-flip scattering at the itinerant spinon modes gives rise to a gapped contribution to the tunneling conductance spectrum. We address the spectral modifications that arise in a magnetic field, which is applied to drive the candidate material α-RuCl_{3} into a QSL phase, and we propose a lateral 1D tunnel junction as a viable setup in this regime. The characteristic spin gap is an unambiguous signature of the fractionalized QSL excitations, distinguishing it from magnons or phonons. We discuss the generalization of our results to a wide variety of QSLs with gapped and gapless spin correlators.