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Shot noise in a strange metal
Liyang Chen1, Dale T Lowder2, Emine Bakali3
1Applied Physics Graduate Program, Rice University, TX 77005, USA.
Science (New York, N.Y.)
|November 23, 2023
Summary
Researchers investigated strange metals, finding that current is not carried by conventional quasiparticles. Shot noise measurements in YbRh2Si2 revealed suppressed noise, indicating a lack of well-defined charge carriers in this exotic metallic state.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Materials
Background:
- Strange-metal behavior is observed in various materials, including high-temperature superconductors and heavy fermion metals.
- In conventional metals, current is carried by quasiparticles, but their absence in strange metals remains experimentally unconfirmed.
Purpose of the Study:
- To provide direct experimental evidence for or against the presence of quasiparticles in strange metals.
- To investigate the nature of current-carrying excitations in the heavy fermion strange metal YbRh2Si2.
Main Methods:
- Fabrication of nanowires from the heavy fermion strange metal YbRh2Si2.
- Measurement of shot noise to probe the granularity of current-carrying excitations.
- Comparison of shot noise in YbRh2Si2 with that in conventional metals.
Main Results:
- Shot noise in YbRh2Si2 nanowires was strongly suppressed compared to conventional metals.
- The observed suppression cannot be explained by electron-phonon or electron-electron interactions within a Fermi liquid framework.
Conclusions:
- The results suggest that current in the probed strange-metal regime of YbRh2Si2 is not carried by well-defined quasiparticles.
- This study provides crucial experimental insight into the fundamental nature of strange metals and paves the way for future investigations.
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