Axial Higgs mode detected by quantum pathway interference in RTe3
Axial Higgs mode detected by quantum pathway interference in RTe3
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DOI：
10.1038/s41586-022-04746-6
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发表时间：
2021-12
期刊：
影响因子：
64.8
通讯作者：
Yiping Wang;Ioannis Petrides;G. McNamara;Md Mofazzel Hosen;Shiming Lei;Yueh-Chun Wu;J. Hart;H. Lv;Jun Yan;Di Xiao;J. Cha;P. Narang;L. Schoop;K. Burch
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作者：
Yiping Wang;Ioannis Petrides;G. McNamara;Md Mofazzel Hosen;Shiming Lei;Yueh-Chun Wu;J. Hart;H. Lv;Jun Yan;Di Xiao;J. Cha;P. Narang;L. Schoop;K. Burch
希格斯玻色子的观察巩固了粒子物理学的标准模型。然而，对异常现象（例如暗物质）的解释依赖于进一步的对称性破缺，需要一个未被发现的轴向希格斯模式。希格斯模式也被发现在磁性，超导和电荷密度波（CDW）系统。揭示低能量模式的矢量特性是具有挑战性的，并且需要超越典型的光谱或散射技术。在这里，我们发现了一个轴Higgs模式的CDW系统RTe 3使用量子路径的干涉。在RTe_3（R = La，Gd）中，电子有序耦合带具有相同或不同的角动量。因此，与希格斯模式相关的拉曼散射张量包含对称和反对称分量，它们通过两个不同但简并的路径被激发。这会导致这些路径的相长干涉或相消干涉，具体取决于入射光和拉曼散射光偏振的选择。的定性行为的拉曼光谱是很好地捕获一个适当的紧束缚模型，包括轴向希格斯模式。反对称分量的解释是希格斯模包含轴向矢量表示（即伪角动量）的直接证据，并暗示CDW是非常规的。因此，我们提供了一种测量集体模式的量子特性，而不诉诸极端的实验条件的手段。
The observation of the Higgs boson solidified the standard model of particle physics. However, explanations of anomalies (for example, dark matter) rely on further symmetry breaking, calling for an undiscovered axial Higgs mode. The Higgs mode was also seen in magnetic, superconducting and charge density wave (CDW) systems,. Uncovering the vector properties of a low-energy mode is challenging, and requires going beyond typical spectroscopic or scattering techniques. Here we discover an axial Higgs mode in the CDW system RTe3using the interference of quantum pathways. In RTe3(R = La, Gd), the electronic ordering couples bands of equal or different angular momenta, –. As such, the Raman scattering tensor associated with the Higgs mode contains both symmetric and antisymmetric components, which are excited via two distinct but degenerate pathways. This leads to constructive or destructive interference of these pathways, depending on the choice of the incident and Raman-scattered light polarization. The qualitative behaviour of the Raman spectra is well captured by an appropriate tight-binding model, including an axial Higgs mode. Elucidation of the antisymmetric component is direct evidence that the Higgs mode contains an axial vector representation (that is, a pseudo-angular momentum) and hints that the CDW is unconventional. Thus, we provide a means for measuring quantum properties of collective modes without resorting to extreme experimental conditions.