Chen, L., Lowder, D. T., Bakali, E., Andrews, A. M., Schrenk, W., Waas, M., Svagera, R., Eguchi, G., Prochaska, L., Wang, Y., Setty, C., Shouvik Sur, Si, Q., Paschen, S., & Natelson, D. (2023). Shot noise in a strange metal. Science, 382(6673), 907–911. https://doi.org/10.34726/5392
E362-01 - Forschungsbereich Optoelektronische Materialien E138-04 - Forschungsbereich Quantum Materials E138-50-3 - Fachgruppe Technische Assistenz E057-12 - Fachbereich Zentrum für Mikro und Nanostrukturen
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Journal:
Science
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ISSN:
0036-8075
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Date (published):
24-Nov-2023
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Number of Pages:
5
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Publisher:
American Association for the Advancement of Science (AAAS)
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Peer reviewed:
Yes
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Keywords:
metal; superconductors; YbRh2Si2; nanowires
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Abstract:
Strange-metal behavior has been observed in materials ranging from high-temperature superconductors to heavy fermion metals. In conventional metals, current is carried by quasiparticles; although it has been suggested that quasiparticles are absent in strange metals, direct experimental evidence is lacking. We measured shot noise to probe the granularity of the current-carrying excitations in nanowires of the heavy fermion strange metal YbRh2Si2. When compared with conventional metals, shot noise in these nanowires is strongly suppressed. This suppression cannot be attributed to either electron-phonon or electron-electron interactions in a Fermi liquid, which suggests that the current is not carried by well-defined quasiparticles in the strange-metal regime that we probed. Our work sets the stage for similar studies of other strange metals.
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Project title:
Manufacturing concept for high precision spectral CO/CO2 sensors: 883941 (FFG - Österr. Forschungsförderungs- gesellschaft mbH) Extreme Spin-Bahn-Kopplung für neue Quantenzustände: I 4047-N27 (FWF - Österr. Wissenschaftsfonds) Zentrum für korrelierte Quantenmaterialien und festkörperbasierte Quantensysteme: F 86 (FWF - Österr. Wissenschaftsfonds) Europäische Mikrokelvin Plattform: 824109 (European Commission)
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Project (external):
US Department of Energy, Basic Energy Sciences, Experimental Condensed Matter Physics award NSF award European Research Council ERC Advanced Grant Austrian Research Promotion Agency (FFG) US Air Force Office of Scientific Research NSF Robert A. Welch Foundation Grant Vannevar Bush Faculty Fellowship