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The field of correlation physics continuously expands its horizons. As a primary objective of the field, we aim to determine the organization of the many billions of billions of electrons in the quantum universe of a solid, taking into account both the electrons’ quantum mechanical nature and their electrostatic repulsive interaction. In the standard description, quasiparticle is a central concept. It acts as the adiabatic continuation of a bare electron in the presence of interactions, and is resilient when the interactions are treated perturbatively. In this talk, I will describe how quasiparticles can break apart in the presence of strong correlations, leading to strange metal behavior. As exemplary settings, heavy fermion metals [1] will be considered and flat band systems will be touched upon [2]. I will also discuss how strange metallicity nucleates topology without quasiparticles [3] and amplifies quantum entanglement [4]. [1] H. Hu et al., arXiv:2210.14183; S. Paschen & Q. Si, Nat. Rev. Phys. 3, 9 (2021); S. Kirchner et al, Rev. Mod. Phys. 92, 011002 (2020); Q. Si et al., Nature 413, 804 (2001). [2] L. Chen et al. arXiv:2307.09431; L. Chen et al, Nat. Comm (to appear); H. Hu and Q. Si, Sci. Adv. 9, eadg0028 (2023). [3] H. Hu et al., arXiv:2110.06182; L. Chen et al., Nat. Phys. 18, 1341 (2022). [4] Y. Fang et al., arXiv:2402.18552.

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Qimiao Si, Rice University
Seminar Room of the Institute of Physics II
Contact: Achim Rosch