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Quantum Capacitance of a Topological Insulator-Ferromagnet Interface.

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We investigated quantum capacitance in topological insulator thin films. Hexagonal warping negatively impacts capacitance, while in-plane magnetization causes energy oscillations, except in specific conditions where it has no effect.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Topological insulators possess unique electronic properties.
  • Quantum capacitance is crucial for understanding charge storage in materials.
  • Thin film heterostructures offer tunable electronic behavior.

Purpose of the Study:

  • To analyze quantum capacitance in magnetized topological insulator thin films.
  • To investigate the effects of hexagonal warping and in-plane magnetization.
  • To explore the influence of an out-of-plane magnetic field.

Main Methods:

  • Theoretical modeling of quantum capacitance.
  • Analysis of energy-dependent capacitance modifications.
  • Examination of interplay between magnetic fields and material properties.

Main Results:

  • Hexagonal warping leads to a negative modification of quantum capacitance.
  • This negative effect increases with energy deviation from charge neutrality.
  • In-plane magnetization induces energy-oscillating changes in quantum capacitance, with exceptions.

Conclusions:

  • Quantum capacitance is sensitive to both hexagonal warping and in-plane magnetization.
  • Specific conditions can lead to magnetization-independent quantum capacitance.
  • Findings provide insights into tuning electronic properties of topological insulators.