Measurements of the quantum geometric tensor in solids
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arXiv
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2024
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| author | Kang, Mingu Kim, Sunje Qian, Yuting Neves, Paul M. Ye, Linda Jung, Junseo Puntel, Denny Mazzola, Federico Fang, Shiang Jozwiak, Chris Bostwick, Aaron Rotenberg, Eli Fuji, Jun Vobornik, Ivana Park, Jae-Hoon Checkelsky, Joseph G. Yang, Bohm-Jung Comin, Riccardo |
| author_facet | Kang, Mingu Kim, Sunje Qian, Yuting Neves, Paul M. Ye, Linda Jung, Junseo Puntel, Denny Mazzola, Federico Fang, Shiang Jozwiak, Chris Bostwick, Aaron Rotenberg, Eli Fuji, Jun Vobornik, Ivana Park, Jae-Hoon Checkelsky, Joseph G. Yang, Bohm-Jung Comin, Riccardo |
| contents | Understanding the geometric properties of quantum states and their implications in fundamental physical phenomena is at the core of modern 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 a fundamental role in the topological magnetoelectric and optoelectronic phenomena. The real part of the QGT is the quantum metric, whose importance has come to prominence very 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. In this work, we develop a framework to measure the QGT (both quantum metric and Berry curvature) in crystalline solids using polarization-, spin-, and angle-resolved photoemission spectroscopy. Using this framework, we demonstrate the effective reconstruction of the QGT in solids in the archetype kagome metal CoSn, which hosts topological flat bands. The key idea is to introduce another geometrical tensor, the quasi-QGT, whose components, the band Drude weight and orbital angular momentum, are experimentally accessible and can be used for extracting the QGT. Establishing such a 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_17809 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Measurements of the quantum geometric tensor in solids Kang, Mingu Kim, Sunje Qian, Yuting Neves, Paul M. Ye, Linda Jung, Junseo Puntel, Denny Mazzola, Federico Fang, Shiang Jozwiak, Chris Bostwick, Aaron Rotenberg, Eli Fuji, Jun Vobornik, Ivana Park, Jae-Hoon Checkelsky, Joseph G. Yang, Bohm-Jung Comin, Riccardo Materials Science Understanding the geometric properties of quantum states and their implications in fundamental physical phenomena is at the core of modern 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 a fundamental role in the topological magnetoelectric and optoelectronic phenomena. The real part of the QGT is the quantum metric, whose importance has come to prominence very 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. In this work, we develop a framework to measure the QGT (both quantum metric and Berry curvature) in crystalline solids using polarization-, spin-, and angle-resolved photoemission spectroscopy. Using this framework, we demonstrate the effective reconstruction of the QGT in solids in the archetype kagome metal CoSn, which hosts topological flat bands. The key idea is to introduce another geometrical tensor, the quasi-QGT, whose components, the band Drude weight and orbital angular momentum, are experimentally accessible and can be used for extracting the QGT. Establishing such a 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. |
| title | Measurements of the quantum geometric tensor in solids |
| topic | Materials Science |
| url | https://arxiv.org/abs/2412.17809 |