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Coulomb engineering of two-dimensional Mott materials.

Erik G C P van Loon1,2,3, Malte Schüler2,3, Daniel Springer4,5

  • 1Mathematical Physics Division, Department of Physics, Lund University, Lund, Sweden.

NPJ 2D Materials and Applications
|April 26, 2024
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Manipulating the dielectric environment of two-dimensional materials controls their Mottness. This Coulomb engineering approach enables tuning the insulating state and achieving an insulator-to-metal transition, with potential experimental realization.

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Electronic properties and materialsSurfaces, interfaces and thin films

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Area of Science:

  • Condensed matter physics
  • Materials science

Background:

  • Two-dimensional materials are sensitive to their dielectric environment.
  • Coulomb interactions dictate the insulating state in Mott materials.

Purpose of the Study:

  • To investigate the impact of dielectric screening on Mottness in two-dimensional materials.
  • To demonstrate a method for controlling Mottness via Coulomb engineering.

Main Methods:

  • Many-body calculations were employed to simulate spectroscopic properties.
  • Analysis focused on Hubbard band shifts and insulator-to-metal transitions.

Main Results:

  • Dielectric screening significantly alters Coulomb interactions, leading to eV-scale shifts in Hubbard bands.
  • A Coulomb engineered insulator-to-metal transition was demonstrated.

Conclusions:

  • Dielectric environment engineering offers a direct pathway to control Mottness in two-dimensional materials.
  • The study provides a proof-of-principle for experimental realization of Coulomb engineering in Mott materials.