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Fabricating van der Waals Heterostructures with Precise Rotational Alignment
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Multicolor x-rays from free electron-driven van der Waals heterostructures.

Sunchao Huang1, Ruihuan Duan2,3, Nikhil Pramanik1

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Van der Waals heterostructures can now generate multicolor X-rays. This breakthrough allows customizable X-ray spectra using free electrons in a table-top setup for advanced imaging and spectroscopy.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Photonics

Background:

  • Van der Waals (vdW) heterostructures enable atomic-scale precision in device fabrication.
  • vdW heterostructures show promise in optical and suboptical technologies like photodetectors and transistors.
  • Current applications are limited to lower energy regimes, excluding X-ray generation.

Purpose of the Study:

  • To theoretically and experimentally demonstrate vdW heterostructures as platforms for multicolor X-ray generation.
  • To explore user-customizable and real-time controllable X-ray spectral profiles.
  • To investigate the potential for advanced X-ray sources.

Main Methods:

  • Utilizing free electron beams to drive vdW heterostructures in a table-top experimental setup.
  • Theoretically modeling X-ray generation dynamics within the heterostructures.
  • Experimentally fabricating and characterizing vdW heterostructures for X-ray emission.

Main Results:

  • Successful generation of multicolor X-ray photons from vdW heterostructures.
  • Demonstrated user-customization of X-ray spectral profiles through heterostructure design.
  • Showcased real-time control over photon energies and intensities by adjusting electron beam parameters and heterostructure properties.

Conclusions:

  • vdW heterostructures are viable platforms for generating tunable multicolor X-rays.
  • This technology offers a versatile and controllable X-ray source.
  • Potential applications include advanced X-ray imaging and spectroscopy.