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Related Experiment Video

Updated: May 25, 2026

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
09:06

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Published on: March 24, 2019

Ferroelectric Surface Potentials Enable Band-Alignment Engineering for Tunable Quantum Anomalous Hall States.

Shuhan Shan1, Yan Liang1,2, Pei Zhao1,2

  • 1College of Physics and Optoelectronic Engineering, Ocean University of China, Qingdao 266100, People's Republic of China.

Nano Letters
|May 23, 2026
PubMed
Summary
This summary is machine-generated.

Ferroelectric substrates enable tunable band alignment in quantum anomalous Hall (QAH) heterostructures. This control switches between metallic and QAH insulating states, paving the way for novel electronic devices.

Keywords:
Band alignment engineeringFerroelectricityFirst-principles calculationsQuantum anomalous Hall effectvan der Waals heterostructures

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Last Updated: May 25, 2026

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
13:56

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

Published on: October 12, 2019

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Phenomena

Background:

  • Quantum anomalous Hall (QAH) effect requires specific band alignment in heterostructures to maintain topological gaps.
  • Band alignment in 2D heterostructures is usually fixed by material choice, limiting tunability.

Purpose of the Study:

  • To demonstrate a nonvolatile method for engineering band alignment in QAH heterostructures.
  • To explore the use of ferroelectric substrates for controlling topological phase transitions.

Main Methods:

  • Utilized first-principles calculations to model a fluorinated MoSe2 monolayer on an In2S3 ferroelectric substrate.
  • Investigated the impact of ferroelectric polarization on surface electrostatic potential and band alignment.

Main Results:

  • Ferroelectric polarization generates a surface potential that shifts energy levels in adjacent layers.
  • Demonstrated a switchable band alignment from type-III to type-I through polarization reversal.
  • Achieved controllable topological phase transitions from metallic to QAH insulating states.

Conclusions:

  • Ferroelectric substrates offer a novel, nonvolatile route to actively engineer band alignment in 2D heterostructures.
  • This tunability enables the control of topological phase transitions, crucial for QAH effect applications.