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A Multimodal Wide-Field Fourier-Transform Raman Microscope

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Single photon emitters in exfoliated WSe2 structures.

M Koperski¹, K Nogajewski², A Arora²

¹1] Laboratoire National des Champs Magnétiques Intenses, CNRS-UJF-UPS-INSA, 25 Rue des Martyrs, Grenoble 38042, France [2] Institute of Experimental Physics, Faculty of Physics, University of Warsaw, Warsaw 02-093, Poland.

Nature Nanotechnology

|May 5, 2015

Summary

This summary is machine-generated.

Researchers discovered single photon emitters at the edges of tungsten diselenide (WSe2) flakes. These imperfections in the 2D material show potential for quantum optoelectronics applications.

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Area of Science:

Condensed Matter Physics
Materials Science
Quantum Optics

Background:

Crystal structure imperfections in solids can act as single photon emitters.
Quantum dots and color centers are known examples of such imperfections.
Imperfections at the edges of layered materials are potential sources of single photon emission.

Purpose of the Study:

Investigate optical properties of thin tungsten diselenide (WSe2) flakes.
Identify and characterize single photon emitters in WSe2.
Explore the potential of WSe2 edge imperfections for quantum optoelectronics.

Main Methods:

Comprehensive optical micro-spectroscopy studies.
Low-temperature photoluminescence spectroscopy.
Photon antibunching measurements.
Excitation spectroscopy and Zeeman effect analysis.

Main Results:

Discovered emission centers at the edges of WSe2 flakes.
Observed sharp emission lines with narrow linewidths (100 μeV) at low temperatures.
Demonstrated photon antibunching, confirming single photon emission.
Linked optical response to 2D properties of WSe2, showing similar energy ranges, excitation spectra, and large Zeeman effects.

Conclusions:

Edge imperfections in WSe2 function as single photon emitters.
The optical properties of these emitters are strongly correlated with the 2D nature of WSe2.
Controlled structural modification of edge imperfections could lead to new functionalities in quantum optoelectronics.