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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
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Fermi-Arc Metals.

Maxim Breitkreiz1, Piet W Brouwer1

  • 1Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, 14195 Berlin, Germany.

Physical Review Letters
|May 27, 2023
PubMed
Summary
This summary is machine-generated.

Researchers predict a new metallic state, the "Fermi-arc metal," in Weyl semimetals. This state exhibits unique properties like ultraquantum states at zero magnetic field, making its Fermi surface undetectable by standard methods.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Weyl semimetals are topological materials with unique electronic properties.
  • Spatially varying Weyl-node positions can lead to novel quantum states.
  • The chiral anomaly is a key feature of Weyl semimetals.

Purpose of the Study:

  • To predict a novel metallic state of matter in Weyl semimetal superstructures.
  • To investigate the electronic and magnetic properties of this new state.
  • To understand the implications for quantum phenomena and experimental detection.

Main Methods:

  • Theoretical prediction of a new metallic state.
  • Analysis of electronic band structure in Weyl semimetal superstructures.
  • Investigation of Fermi surfaces and Landau levels.

Main Results:

  • A novel "Fermi-arc metal" state is predicted, characterized by stretched Weyl nodes forming anisotropic Fermi surfaces from Fermi arclike states.
  • This state exhibits the chiral anomaly and reaches an ultraquantum state at zero magnetic field.
  • The Fermi surface is invisible to de Haas-van Alphen and Shubnikov-de Haas effects due to the dominance of the ultraquantum state.

Conclusions:

  • The Fermi-arc metal represents a new phase of matter with exotic electronic properties.
  • The unique characteristics of this state offer new avenues for exploring quantum phenomena.
  • The invisibility of its Fermi surface to common detection methods necessitates alternative experimental probes.