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Observation and Analysis of Blinking Surface-enhanced Raman Scattering

Observation and Analysis of Blinking Surface-enhanced Raman Scattering

Published on: January 11, 2018

Correlated fluorescence blinking in two-dimensional semiconductor heterostructures.

Weigao Xu¹, Weiwei Liu¹, Jan F Schmidt²

¹Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore.

|December 16, 2016

Summary

Researchers discovered correlated blinking in 2D semiconductor heterostructures. This effect involves coupled bright and dark states between layers, driven by interlayer charge transfer, offering new quantum technology applications.

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Area of Science:

Condensed Matter Physics
Materials Science
Quantum Optics

Background:

Blinking (fluorescence intermittency) is well-studied in 0D and 1D systems, typically involving charge state fluctuations.
The mechanism of blinking in 2D materials, particularly van der Waals heterostructures, remains less understood.

Purpose of the Study:

To investigate blinking phenomena in vertically stacked 2D semiconductor heterostructures.
To elucidate the underlying mechanisms and explore potential applications of observed blinking effects.

Main Methods:

Fabrication of vertically stacked 2D heterostructures from transition metal dichalcogenides (TMDs).
Utilized fluorescence cross-correlation spectroscopy to analyze blinking behavior and interlayer coupling.

Main Results:

Observed a novel correlated blinking effect in 2D TMD heterostructures, featuring coupled bright, neutral, and dark states.
Demonstrated that a bright state in one monolayer induces a dark state in the adjacent monolayer due to intermittent interlayer carrier transfer.
Identified a distinct blinking mechanism compared to 0D and 1D systems.

Conclusions:

Bilayer van der Waals heterostructures exhibit unique correlated blinking behavior driven by interlayer charge dynamics.
These systems serve as valuable platforms for studying charge-transfer physics and non-equilibrium phenomena.
Potential applications include correlated light emitters for quantum technology.