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Visualizing Spatial Evolution of Electron-Correlated Interface in Two-Dimensional Heterostructures.

Quanzhen Zhang1, Yanhui Hou1, Teng Zhang1

  • 1MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices, School of Integrated Circuits and Electronics, Beijing Institute of Technology, Beijing 100081, China.

ACS Nano
|October 4, 2021
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Summary

Phase engineering in Niobium diselenide (NbSe2) heterostructures reveals how metallic states influence Mott insulators. This study microscopically visualizes electronic structure evolution at interfaces, offering insights into controlling correlated electron systems.

Keywords:
Mott insulatorcharge density wavephase engineeringscanning tunneling microscopytransition metal dichalcogenides

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Surface Science

Background:

  • Understanding interfacial electronic structures is crucial for electron-correlated materials.
  • Phase engineering offers a pathway to tune material properties.

Purpose of the Study:

  • To microscopically visualize the evolution of electronic structures at the interface of a phase-engineered monolayer NbSe2 heterostructure.
  • To investigate the interplay between metallic and Mott insulating states at the H/T phase boundary.
  • To elucidate the mechanism behind Mott gap collapse at the electronic phase transition.

Main Methods:

  • Scanning tunneling microscopy (STM) for high-resolution imaging.
  • Scanning tunneling spectroscopy (STS) for electronic structure analysis.
  • Theoretical calculations to support experimental observations.

Main Results:

  • The metallic H-NbSe2 state penetrates the Mott insulating T-NbSe2 at the interface.
  • A significant 2D charge density wave (CDW) proximity effect is observed.
  • Mott gap collapse and disappearance of the upper Hubbard band occur at the transition region.
  • Theoretical calculations attribute Mott gap collapse to interface-induced electron doping.

Conclusions:

  • Phase engineering provides a method to control Mott insulating states in electron-correlated systems.
  • The study offers a microscopical understanding of interactions between different electron-correlated domains.
  • Interface-induced electron doping is key to understanding Mott gap collapse.