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Crystal Field Theory - Octahedral Complexes

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Crystal Field Theory
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Related Experiment Video

Updated: Jul 8, 2025

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

Published on: October 31, 2019

Light-induced shift current vortex crystals in moiré heterobilayers.

Chen Hu^1,2, Mit H Naik^1,2, Yang-Hao Chan^1,2,3

¹Department of Physics, University of California at Berkeley, Berkeley, CA 94720.

Proceedings of the National Academy of Sciences of the United States of America

|December 12, 2023

Summary

Researchers discovered light-induced shift current vortex crystals in WSe2/WS2 moiré superlattices. These novel structures exhibit tunable properties and are influenced by electron-hole interactions, opening new avenues for optoelectronic applications.

Keywords:

moiré heterobilayers shift current time-dependent GW vortex crystals

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Last Updated: Jul 8, 2025

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Area of Science:

Condensed Matter Physics
Materials Science
Optoelectronics

Background:

Transition metal dichalcogenide (TMD) moiré superlattices are a novel platform for studying light-matter interactions.
Moiré excitons in these systems have garnered significant interest, but their nonlinear optical responses remain largely unexplored.

Purpose of the Study:

To investigate light-induced shift currents in WSe2/WS2 moiré superlattices.
To explore the formation and properties of nonlinear optical responses in these engineered quantum materials.

Main Methods:

Experimental investigation of shift currents using a laboratory laser setup.
Analysis of the optical tunability of shift current vortex crystals.
Theoretical consideration of electron-hole interactions (excitonic effects).

Main Results:

Observation of shift current vortex crystals, forming 2D periodic arrays of current vortices and magnetic fields.
Demonstration of optical tunability of vortex properties (location, shape, chirality, magnitude) via incident light parameters.
Identification of the crucial role of excitonic effects in shift current generation and distribution.

Conclusions:

Shift current vortex crystals represent a striking nonlinear optical phenomenon in TMD moiré superlattices.
All-optical control of nanoscale current and magnetic field patterns is achievable.
Findings advance understanding of nonlinear optics in moiré quantum matter and suggest potential applications.