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Is the optical conductivity of heavy fermion strange metals Planckian?

Li, Xinwei and Kono, Junichiro and Si, Qimiao and Paschen, Silke (2022) Is the optical conductivity of heavy fermion strange metals Planckian? . (Unpublished)

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Strange metal behavior appears across a variety of condensed matter settings and beyond, and achieving a universal understanding is an exciting prospect. The beyond-Landau quantum criticality of Kondo destruction has had considerable success in describing the behavior of strange metal heavy fermion compounds, and there is some evidence that the associated partial localization-delocalization nature can be generalized to diverse materials classes. Other potential overarching principles at play are also being explored. An intriguing proposal is that Planckian scattering, with a rate of k_BT/ℏ, captures the linear temperature dependence of the (dc) electrical resistivity, which is a hallmark of strange metal behavior. Here we extend a previously introduced analysis scheme based of the Drude description of the dc resistivity to optical conductivity data. When they are well described by a simple (ac) Drude model, the scattering rate can be directly extracted. This avoids the need to determine the ratio of charge carrier concentration to effective mass, which has complicated previous analyses based on the dc resistivity. However, we point out that strange metals may exhibit strong deviations from Drude behavior, as exemplified by the "extreme" strange metal YbRh₂Si₂. This calls for alternative approaches, and we point to the power of scaling relationships in terms of temperature and energy (or frequency).

Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription Paper
Li, Xinwei0000-0003-0555-2624
Kono, Junichiro0000-0002-4195-0577
Si, Qimiao0000-0003-1357-2705
Paschen, Silke0000-0002-3796-0713
Additional Information:We acknowledge fruitful discussion with Patrick Lee, Marc Scheffler, T. Senthil, Mathieu Taupin, and Eric van Heumen. XL acknowledges support from the Caltech Postdoctoral Prize Fellowship and the IQIM. JK acknowledges support from the Robert A. Welch Foundation through Grant No. C-1509. QS acknowledges support from the Air Force Office of Scientific Research under Grant No. FA9550-21-1-0356 and the Robert A. Welch Foundation under Grant No. C-1411. SP acknowledges funding from the European Union’s Horizon 2020 Research and Innovation Programme under Grant Agreement no 824109 and from the Austrian Science Fund (FWF Grants 29296-N27 and I5868-N–FOR 5249 - QUAST). SP and QS acknowledge the hospitality of the Aspen Center for Physics, which is supported by NSF grant No. PHY-1607611. AUTHOR CONTRIBUTIONS. XL performed the Drude analyses, SP conceived the work and wrote the paper, with input from XL, JK, and QS. All authors contributed to the discussion. The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Group:Institute for Quantum Information and Matter
Funding AgencyGrant Number
Caltech Postdoctoral FellowshipUNSPECIFIED
Institute for Quantum Information and Matter (IQIM)UNSPECIFIED
Robert A. Welch FoundationC-1509
Air Force Office of Scientific Research (AFOSR)FA9550-21-1-0356
Robert A. Welch FoundationC-1411
European Research Council (ERC)824109
FWF Der Wissenschaftsfonds29296-N27
FWF Der WissenschaftsfondsI5868-N–FOR 5249
Subject Keywords:strange metals, Planckian scattering, optical conductivity, Drude model, heavy fermion compounds, quantum criticality, non-Fermi liquid, YbRh₂Si₂
Record Number:CaltechAUTHORS:20220707-204118082
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:115410
Deposited By: George Porter
Deposited On:08 Jul 2022 22:18
Last Modified:02 Jun 2023 01:35

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