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arXiv 1506.04752cond-mat.str-el
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用共振非弹性X射线散射探测隐级

Probing Hidden Orders with Resonant Inelastic X-Ray Scattering

Lucile Savary, T. Senthil

摘要:

我们提出了一个通用的方案,推导出的信号共振非弹性(和弹性)X射线散射(RIXS)提供访问。特别是,我们发现,RIXS应该允许直接检测许多隐藏的订单,如自旋手性,键手性,矢量和标量自旋手性。为了做到这一点,我们选择从有效算子的角度出发,不对微观细节进行具体描述,但仍然保持实验可控参数的明确性,比如x射线的入射和出射偏振。我们问的不是什么微观过程可以导致一个特定的结果,而是什么样的耦合在原则上是可能的。这种方法允许系统地列举对一般RIXS信号的贡献的所有可能来源。虽然我们主要关注磁绝缘体,我们给出了一些例子,我们的分析进行到系统的电荷和其他自由度,我们简要地解决。我们希望这项工作将有助于指导理论家和实验学家在设计和解释RIXS实验。

英文摘要:

We propose a general scheme for the derivation of the signals resonant inelastic (and elastic) x-ray scattering (RIXS) gives access to. In particular, we find that RIXS should allow to directly detect many hidden orders, such as spin nematic, bond nematic, vector and scalar spin chiralities. To do so, we choose to take the point of view of effective operators, leaving microscopic details unspecified, but still keeping experimentally-controllable parameters explicit, like the incoming and outgoing polarizations of the x-rays. We ask not what microscopic processes can lead to a specific outcome, but, rather, what couplings are in principle possible. This approach allows to systematically enumerate all possible origins of contributions to a general RIXS signal. Although we mainly focus on magnetic insulators, for which we give a number of examples, our analysis carries over to systems with charge and other degrees of freedom, which we briefly address. We hope this work will help guide theorists and experimentalists alike in the design and interpretation of RIXS experiments.

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