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SYQI: Symposium Entanglement in Quantum Information, Condensed Matter and Gravity

SYQI 1: Entanglement in quantum information, condensed matter and gravity

SYQI 1.2: Invited Talk

Wednesday, March 20, 2024, 15:30–16:00, H 0105

Strange metals - A platform to study entanglement in condensed matter? — •Silke Paschen — Institute of Solid State Physics, TU Wien, Vienna, Austria

It is generally considered to be notoriously difficult to define, detect, or even quantify entanglement in condensed matter systems. I will discuss the potential of the "strange metal" state to make progress. Strange metal behavior, best known as a linear-in-temperature electrical resistivity at low temperatures instead of the normal Fermi liquid square-in-temperature one, occurs across many classes of quantum materials [1,2]. Its full understanding is a major challenge. Heavy fermion compounds are particularly versatile model materials for studying this physics: they are comparatively simple, clean, and highly tunable, and several characteristics beyond linear-in-temperature resistivity have already been identified. I will give an overview and highlight recent results, including dynamical scaling of the terahertz conductivity [3], strongly suppressed shot noise [4], and a quantum Fisher information analysis of inelastic neutron scattering data [5].

[1] S. Paschen, Q. Si, Nat. Rev. Phys. 3, 9 (2021).

[2] J. G. Checkelsky, B. A. Bernevig, P. Coleman, Q. Si, S. Paschen

arXiv:2312.10659, to appear in Nat. Rev. Mater. (2024).

[3] L. Prochaska et al., Science 367, 285 (2020).

[4] L. Chen et al., Science 382, 907 (2023).

[5] F. Mazza et al., unpublished (2024).

Keywords: quantum materials; quantum criticality; entanglement; heavy fermion compounds