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Enhanced Nonlinear Response by Manipulating the Dirac Point at the (111) LaTiO_{3}/SrTiO_{3} Interface.

G Tuvia1, A Burshtein1, I Silber1

  • 1School of Physics and Astronomy, Tel-Aviv University, Tel Aviv 6997801, Israel.

Physical Review Letters
|April 19, 2024
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Summary
This summary is machine-generated.

Tunable spin-orbit interaction (SOI) in LaTiO3/SrTiO3 interfaces causes nonlinear transport. An in-plane magnetic field enhances this effect by shifting the Dirac point, while an out-of-plane field suppresses it.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Tunable spin-orbit interaction (SOI) is crucial for spintronic devices.
  • SOI can induce energy band asymmetry, leading to nonlinear transport phenomena (V~I^2).
  • The (111) LaTiO3/SrTiO3 interface offers a single-band Hall response, ideal for studying SOI effects.

Purpose of the Study:

  • Investigate the role of SOI in nonlinear transport at the (111) LaTiO3/SrTiO3 interface.
  • Analyze the influence of magnetic fields on SOI-induced nonlinear transport.
  • Understand the mechanism behind magnetic field-dependent nonlinear resistance.

Main Methods:

  • Experimental measurements of nonlinear longitudinal resistance.
  • Application of in-plane and out-of-plane magnetic fields.
  • Theoretical analysis based on the Dirac point location and Fermi contour symmetry.

Main Results:

  • A significant increase in nonlinear longitudinal resistance was observed at a critical in-plane magnetic field (Hcr).
  • The observed rise in nonlinear resistance diminished with the introduction of an out-of-plane magnetic field component.
  • The behavior was explained by the magnetic field's influence on the Dirac point position relative to the Fermi contour.

Conclusions:

  • The position of the Dirac point, determined by magnetic field orientation, critically affects nonlinear transport.
  • In-plane magnetic fields enhance nonlinear transport by shifting the Dirac point away from the Fermi contour.
  • Out-of-plane magnetic fields suppress nonlinear effects by gapping the Dirac point, offering a unified explanation for related magnetoresistance phenomena.