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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Ferroelectric Switching at Symmetry-Broken Interfaces by Local Control of Dislocations Networks
Laurent Molino1, Leena Aggarwal1, Vladimir Enaldiev2
1Department of Physics, University of Ottawa, Ottawa, K1N 6N5, Canada.
Advanced Materials (Deerfield Beach, Fla.)
|June 28, 2023
Summary
Researchers demonstrate local control of ferroelectric domains in twisted WS₂ bilayers at room temperature. This breakthrough in 2D semiconducting ferroelectrics is key for next-generation electronic devices.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Semiconducting ferroelectric materials enable advanced electronics like ferroelectric field-effect transistors.
- Interfacial ferroelectricity in transition metal dichalcogenide (TMD) bilayers merges 2D material flexibility with ferroelectric properties.
Purpose of the Study:
- To demonstrate local control of ferroelectric domains in a twisted WS₂ bilayer at room temperature.
- To understand the reversible evolution of these domains using a domain wall network (DWN) model.
Main Methods:
- Utilized scanning tunneling microscopy (STM) for local domain manipulation.
- Employed a string-like model to analyze the domain wall network (DWN) evolution.
Main Results:
- Achieved local control over ferroelectric domains in a marginally twisted WS₂ bilayer.
- Identified two regimes of DWN evolution: elastic bending of dislocations and merging into screw dislocations.
- Observed domain structure recovery upon electric field reversal, seeded by screw dislocations.
Conclusions:
- Demonstrated the possibility of precise control over atomically thin semiconducting ferroelectric domains via local electric fields.
- This research is a critical step towards the technological application of 2D ferroelectric materials.
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