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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Nernst quantum oscillations in bulk semi-metals.

Zengwei Zhu1, Huan Yang, Aritra Banerjee

  • 1LPEM (UPMC-CNRS), Ecole Supérieure de Physique et de Chimie Industrielles, Paris, France.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|February 23, 2011
PubMed
Summary

Researchers studied bismuth and graphite quantum limits using a 10 T magnetic field. Unexpected Nernst peaks in bismuth suggest complex interactions beyond simple models, especially in pure samples.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials Science
  • Solid-State Physics

Background:

  • Bismuth and graphite are elemental semi-metals with dual-sign charge carriers at zero magnetic field.
  • The quantum limit, achievable with a 10 T magnetic field, confines quasi-particles to limited Landau tubes.

Purpose of the Study:

  • To investigate the Nernst response in bismuth and graphite at the quantum limit.
  • To explore emergent phenomena and deviations from non-interacting theories in these semi-metals.

Main Methods:

  • Experimental application of a 10 T magnetic field to bismuth and graphite samples.
  • Measurement of the Nernst response as a function of magnetic field strength.
  • Analysis of quasi-particle behavior and Landau tube dynamics.

Main Results:

  • Sharp peaks in Nernst response observed as Landau tubes interact with the Fermi surface.
  • Discovery of unexpected Nernst peaks in bismuth beyond the quantum limit, not predicted by non-interacting models.
  • Correlation between the amplitude of these unexpected peaks and electron mean free path in bismuth.

Conclusions:

  • The Nernst response in bismuth exhibits complex behavior beyond the quantum limit, indicating the importance of interactions.
  • The observed phenomena challenge existing non-interacting theoretical frameworks for semi-metals.
  • Material purity, indicated by electron mean free path, significantly influences emergent quantum effects in bismuth.