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Ferroicity-driven nonlinear photocurrent switching in time-reversal invariant ferroic materials
1Department of Materials Science and Engineering, Texas A&M University, College Station, TX 77843, USA.
Science Advances
|August 28, 2019
Summary
Researchers show ferroicity-driven nonlinear photocurrent switching in multiferroics. This control over nonlinear optical responses using light polarization and ferroic orders opens new possibilities for optoelectronics.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nonlinear Optics
Background:
- Nonlinear optical responses, governed by susceptibilities, are vital for nonlinear optics and optoelectronics.
- Ferroic materials offer unique properties for advanced electronic applications.
Purpose of the Study:
- To demonstrate ferroicity-driven nonlinear photocurrent switching in time-reversal invariant multiferroics.
- To explore the control of second-order current responses by ferroic orders and light polarization.
Main Methods:
- Utilizing group theoretical analyses.
- Employing first-principles theory.
- Investigating a representative class of two-dimensional multiferroic materials.
Main Results:
- Achieved ferroicity-driven nonlinear photocurrent switching.
- Identified shift current (linear polarization) and circular photocurrent (circular polarization).
- Elucidated the microscopic mechanism involving symmetries, shift vector, and Berry curvature.
Conclusions:
- Ferroicity-driven nonlinear photocurrent switching is feasible in multiferroics.
- This phenomenon enables control via coupled ferroic orders and nonlinear responses.
- Opens avenues for nonlinear optoelectronics and nonlinear multiferroics.
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