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Updated: Oct 11, 2025

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
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Field-Dependent Band Structure Measurements in Two-Dimensional Heterostructures.

Paul V Nguyen1, Natalie C Teutsch2, Nathan P Wilson1

  • 1Department of Physics, University of Washington, Seattle, Washington 98195, United States.

Nano Letters
|December 1, 2021
PubMed
Summary
This summary is machine-generated.

Electric fields applied via electrostatic gating can tune the band alignment in van der Waals heterostructures. This study directly measures these crucial band structure changes in graphene/transition metal dichalcogenide systems.

Keywords:
Two-dimensional materialsangle resolved photoemission spectroscopytwo-dimensional heterostructurestwo-dimensional semiconductors

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Van der Waals heterostructures are key components in advanced electronic and optoelectronic devices.
  • Electric fields significantly alter their band structure, impacting device performance.
  • Direct measurement of these field-induced band changes has been challenging.

Purpose of the Study:

  • To directly measure electric field-induced changes in band alignment within van der Waals heterostructures.
  • To correlate these band shifts with electrostatic gating effects.
  • To validate a simple model for understanding band structure modifications in these systems.

Main Methods:

  • Fabrication of van der Waals heterostructures using graphene, monolayer transition metal dichalcogenides (WSe2 or MoSe2), boron nitride, and graphite.
  • Utilizing spatially resolved angle-resolved photoemission spectroscopy (ARPES).
  • Applying electrostatic gating via a graphite gate to induce electric fields.

Main Results:

  • Observed shifts in semiconductor band alignment relative to graphene up to 0.2 eV.
  • Demonstrated that electrostatic gating effectively modulates the band structure.
  • The experimental results align with a model assuming minimal material hybridization.

Conclusions:

  • Spatially resolved ARPES is a powerful technique for probing field-induced band structure modifications in heterostructures.
  • Electrostatic gating provides a tunable knob for controlling band alignment in graphene-based van der Waals devices.
  • The findings support a simplified understanding of band behavior in these layered materials.