Record link: 
http://hdl.handle.net/20.500.12708/177023
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Title: 
Shot noise indicates the lack of quasiparticles in a strange metal
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Citation: 
Liyang Chen, Dale T. Lowder, Bakali, E., Andrews, A. M., Schrenk, W., Waas, M., Svagera, R., Eguchi, G., Prochaska, L., Yiming Wang, Setty, C., Shouvik Sur, Si, Q., Bühler-Paschen, S., & Douglas Natelson. (2022). Shot noise indicates the lack of quasiparticles in a strange metal. arXiv. https://doi.org/10.48550/arXiv.2206.00673
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Publisher DOI: 
10.48550/arXiv.2206.00673
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Publication Type: 
Preprint
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Language: 
English
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Authors: 
Liyang Chen 
Dale T. Lowder 
Bakali, Emine 
Andrews, Aaron Maxwell 
Schrenk, Werner 
Waas, Monika 
Svagera, Robert 
Eguchi, Gaku 
Prochaska, Lukas 
Yiming Wang 
Setty, Chandan 
Shouvik Sur 
Si, Qimiao 
Bühler-Paschen, Silke 
Douglas Natelson 
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Organisational Unit: 
E138-04 - Forschungsbereich Quantum Materials 
E138 - Institut für Festkörperphysik 
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ArXiv ID: 
2206.00673
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Date (published): 
6-Dec-2022
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Preprint Server: 
arXiv
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Keywords: 
solid state physics; intermetallic compounds; strongly correlated electron systems
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Abstract: 
Understanding of strange metal properties, observed in materials from the high-temperature superconductors to heavy fermion metals and van der Waals structures, is an outstanding challenge. In conventional metals, current is carried by quasiparticles with charge of magnitude e, and while it has been suggested that quasiparticles are absent in strange metals, direct experimental evidence is lacking. Shot noise probes the granularity of the current-carrying excitations. We examine nanowires of the heavy fermion strange metal YbRh 2 Si2 and discover strongly suppressed shot noise compared to conventional metals. This suppression can neither be attributed to electron-phonon interactions nor to electron-electron interactions in a Fermi liquid and therefore reveals that the current is not carried by well-defined quasiparticles. Our work sets the stage for similar studies on other strange metals, to test the universality of this result.
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Project title: 
Correlation-driven metallic topology: 101055088 (European Commission) 
Europäische Mikrokelvin Plattform: 824109 (European Commission) 
Funktionelle Festkörper: W1243-N16 (Fonds zur Förderung der wissenschaftlichen Forschung (FWF)) 
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Research Areas: 
Metallic Materials: 20%
Special and Engineering Materials: 15%
Quantum Many-body Systems Physics: 65%
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Science Branch: 
1030 - Physik, Astronomie: 100%
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