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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

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Published on: June 28, 2016

Charge transport and localization in atomically coherent quantum dot solids.

Kevin Whitham¹, Jun Yang², Benjamin H Savitzky³

¹Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, USA.

Nature Materials

|February 23, 2016

Summary

This summary is machine-generated.

Researchers fabricated quantum dot superlattices, revealing that missing connections cause electron localization. Improving these connections could unlock novel electronic properties and devices.

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Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Ordered quantum dot superlattices offer a pathway to quasi-two-dimensional materials with exotic electronic properties.
Disorder in these structures is known to cause electron localization, hindering potential applications.
Precise structural characterization and understanding disorder effects are crucial.

Purpose of the Study:

To investigate the impact of structural disorder, specifically missing epitaxial connections, on electron localization in quantum dot superlattices.
To correlate experimental findings with theoretical calculations of electronic structure.
To identify pathways for improving superlattice quality and realizing predicted electronic phenomena.

Main Methods:

Fabrication of quantum dot superlattices with controlled registration and a specific percentage (20%) of missing epitaxial connections.
Experimental transport measurements to infer electron localization.
Theoretical calculations of electronic structure incorporating measured disorder.

Main Results:

Experimental fabrication achieved high registration of quantum dots, limited by polydispersity.
A significant fraction (20%) of missing epitaxial connections was introduced.
Calculations accurately reproduced experimentally observed electron localization, attributing it to the disorder.
Theoretical analysis indicates that improved epitaxial connections will lead to electron delocalization.

Conclusions:

Structural disorder, particularly missing epitaxial connections, is the primary cause of electron localization in these quantum dot superlattices.
Precise structural characterization and theoretical modeling are essential for understanding and predicting material properties.
Enhancing the quality of epitaxial connections holds the key to unlocking the predicted Dirac cones, topological states, and advanced optoelectronic functionalities.