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Quantum Hall effect in a CVD-grown oxide.

Oleksandr Zheliuk1,2, Yuliia Kreminska3, Qundong Fu4

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Summary
This summary is machine-generated.

We achieved the integer quantum Hall effect in chemical vapor deposition grown Bismuth Oxyde Selenide (Bi2O2Se) thin films. This accessible 2D oxide platform enables tunable electron systems for exploring quantum phenomena.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Phenomena

Background:

  • Two-dimensional (2D) electron systems are crucial for studying correlated quantum phenomena.
  • 2D oxides offer a versatile platform for diverse quantum phases, including the quantum Hall effect, superconductivity, and magnetism.
  • Achieving these quantum phases in 2D oxides depends significantly on advanced heterostructure growth techniques.

Purpose of the Study:

  • To demonstrate the integer quantum Hall effect in chemical vapor deposition (CVD) grown Bismuth Oxyde Selenide (Bi2O2Se).
  • To establish Bi2O2Se as an accessible and structurally flexible 2D oxide platform for quantum physics research.
  • To explore the tunability of electron systems in Bi2O2Se for novel quantum phase investigations.

Main Methods:

  • Fabrication of thin films of Bismuth Oxyde Selenide (Bi2O2Se) using chemical vapor deposition (CVD).
  • Engineering of single or few subband two-dimensional electron systems (2DES) by controlling film thickness.
  • Tuning of electron occupation in the 2DES via the electric field effect.

Main Results:

  • Successful observation of the integer quantum Hall effect in CVD-grown Bi2O2Se.
  • Demonstration of subband control through film thickness, a key design parameter for the 2DES.
  • Bi2O2Se exhibits a unique small effective mass, differentiating it from other high-mobility oxides.

Conclusions:

  • Bismuth Oxyde Selenide (Bi2O2Se) serves as a promising and accessible 2D oxide material for realizing quantum Hall physics.
  • The layered structure of Bi2O2Se allows for structural flexibility and scalable growth.
  • This material provides a novel platform for exploring quantum phenomena in tunable two-dimensional electron systems.