测量固体中的量子几何张量

IF 17.6 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
Mingu Kang, Sunje Kim, Yuting Qian, Paul M. Neves, Linda Ye, Junseo Jung, Denny Puntel, Federico Mazzola, Shiang Fang, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, Jun Fuji, Ivana Vobornik, Jae-Hoon Park, Joseph G. Checkelsky, Bohm-Jung Yang, Riccardo Comin
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引用次数: 0

摘要

理解量子态的几何特性及其对基本物理现象的影响是当代物理学的核心内容。量子几何张量(QGT)是这方面的核心物理对象,它完整地编码了量子态的几何信息。QGT 的虚部是著名的贝里曲率,在拓扑磁电和光电现象中发挥着不可或缺的作用。QGT 的实部是量子度量,其重要性近来逐渐凸显,引发了一系列新的量子几何现象,如反常朗道水平、平带超流、激子兰姆位移和非线性霍尔效应。尽管 QGT 非常重要,但其实验测量却仅限于人工两级系统。在这里,我们建立了一个框架,利用偏振、自旋和角度分辨光发射光谱测量晶体固体中的 QGT。利用这一框架,我们展示了在含有拓扑扁平带的卡戈米金属 CoSn 中有效重建 QGT 的方法。建立这种动量和能量分辨的 QGT 光谱探针,将极大地推动我们对各种晶体系统中量子几何响应的理解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Measurements of the quantum geometric tensor in solids

Measurements of the quantum geometric tensor in solids

Understanding the geometric properties of quantum states and their implications in fundamental physical phenomena is a core aspect of contemporary physics. The quantum geometric tensor (QGT) is a central physical object in this regard, encoding complete information about the geometry of the quantum state. The imaginary part of the QGT is the well-known Berry curvature, which plays an integral role in the topological magnetoelectric and optoelectronic phenomena. The real part of the QGT is the quantum metric, whose importance has come to prominence recently, giving rise to a new set of quantum geometric phenomena such as anomalous Landau levels, flat band superfluidity, excitonic Lamb shifts and nonlinear Hall effect. Despite the central importance of the QGT, its experimental measurements have been restricted only to artificial two-level systems. Here, we develop a framework to measure the QGT in crystalline solids using polarization-, spin- and angle-resolved photoemission spectroscopy. Using this framework, we demonstrate the effective reconstruction of the QGT in the kagome metal CoSn, which hosts topological flat bands. Establishing this momentum- and energy-resolved spectroscopic probe of the QGT is poised to significantly advance our understanding of quantum geometric responses in a wide range of crystalline systems.

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来源期刊
Nature Physics
Nature Physics 物理-物理:综合
CiteScore
30.40
自引率
2.00%
发文量
349
审稿时长
4-8 weeks
期刊介绍: Nature Physics is dedicated to publishing top-tier original research in physics with a fair and rigorous review process. It provides high visibility and access to a broad readership, maintaining high standards in copy editing and production, ensuring rapid publication, and maintaining independence from academic societies and other vested interests. The journal presents two main research paper formats: Letters and Articles. Alongside primary research, Nature Physics serves as a central source for valuable information within the physics community through Review Articles, News & Views, Research Highlights covering crucial developments across the physics literature, Commentaries, Book Reviews, and Correspondence.
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