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This summary is machine-generated.

Researchers demonstrate programmable topological transport in altermagnets without magnetic fields. Rotating crystalline phases of altermagnetic electrodes controls chiral edge channels and thermoelectric properties in topological insulators.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Spintronics

Background:

  • Altermagnets offer unique control over spin textures.
  • Topological insulators host robust surface states.
  • Berry curvature engineering is a key area in condensed matter physics.

Purpose of the Study:

  • To explore a novel two-terminal device architecture for topological transport control.
  • To investigate the impact of altermagnetic electrode phase rotation on topological surface states.
  • To achieve tunable topological transport without external magnetic fields or net magnetization.

Main Methods:

  • Fabrication of a two-terminal device with a topological-insulator film interfaced with two altermagnetic electrodes.
  • Utilizing proximity coupling to imprint spin textures onto surface states.
  • Independent rotation of altermagnetic electrode crystalline phases.
  • Development of a compact Dirac model for theoretical analysis.

Main Results:

  • Demonstrated imprinting of momentum-dependent spin textures onto Dirac surface states, creating an angular mass.
  • Showcased tuning of chiral edge channels and discrete conductance steps via electrode phase rotation.
  • Observed reversible inversion of the thermoelectric Hall coefficient without external magnetic fields.
  • Validated the mechanism's resilience to moderate disorder using a Dirac model.

Conclusions:

  • A symmetry-driven mechanism enables programmable topological transport through lattice rotation.
  • This approach offers a practical, low-dissipation route for controlling topological states.
  • The findings pave the way for novel spintronic devices and quantum information applications.