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Quantum interference in superposed lattices.

Yejun Feng1, Yishu Wang2,3, T F Rosenbaum4

  • 1Okinawa Institute of Science and Technology Graduate University, Onna, Okinawa 904-0495, Japan.

Proceedings of the National Academy of Sciences of the United States of America
|February 5, 2024
PubMed
Summary
This summary is machine-generated.

Shubnikov-de Haas oscillations in chromium reveal unique quantum interference effects. These findings illuminate the material

Keywords:
fermiologyincommensurate reciprocal latticesquantum oscillationsπ-phase shift

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials Science

Background:

  • Shubnikov-de Haas (SdH) oscillations are crucial for understanding quantum transport phenomena in solids.
  • These oscillations provide insights into mesoscopic properties and material structure, especially under magnetic fields.
  • Previous studies focused on materials with simpler lattice structures and ground states.

Purpose of the Study:

  • To investigate the nature of quantum transport in elemental chromium, a material with a complex spin-density-wave ground state and incommensurately superposed lattices.
  • To analyze the phase relationships of Shubnikov-de Haas oscillations in chromium under varying magnetic fields.
  • To elucidate the origin of observed phase shifts in low-frequency SdH oscillations.

Main Methods:

  • Experimental measurements of Shubnikov-de Haas oscillations in elemental chromium at low temperatures and under magnetic fields.
  • Analysis of oscillation phases in different crystallographic directions ([Formula: see text] and [Formula: see text]).
  • Theoretical modeling to explain the observed quantum interference effects and phase shifts.

Main Results:

  • Observed low-frequency Shubnikov-de Haas oscillations in chromium exhibiting opposite phases between [Formula: see text] and [Formula: see text] directions.
  • This phase behavior contrasts with typical cyclotron orbits that show identical phases.
  • The study attributes these unique oscillations to quantum interference effects from incommensurate orbits within chromium's superposed lattices.

Conclusions:

  • The observed [Formula: see text]-phase shift in low-frequency SdH oscillations is explained by the reconnection of anisotropic joint open and closed orbits.
  • These findings highlight the influence of complex lattice structures and spin-density-wave states on quantum transport.
  • The study advances the understanding of quantum and topological phenomena in complex metallic systems.