Optical Measurement of the Phase-Breaking Length in Graphene
Luiz Gustavo Cancado, Ryan Beams, and Lukas Novotny
TL;DR
This study experimentally measures the phase-breaking length of conduction electrons in graphene using Raman spectroscopy, revealing a length of approximately 40nm near the edges, which enhances understanding of electron coherence in graphene.
Contribution
It introduces a method to determine the phase-breaking length in graphene via Raman spectroscopy, combining spatial susceptibility analysis with the double-resonance model.
Findings
Phase-breaking length L~40nm near graphene edges
High-accuracy spatial variation of Raman susceptibilities
Method applicable to other two-dimensional materials
Abstract
This paper reports the experimental determination of the phase-breaking length L of conduction electrons in graphene using Raman spectroscopy. Based on the double-resonance model, we extract L from the spatial dependence of the D band susceptibility near the graphene edge. By using prior knowledge of sample properties and the excitation point-spread function we are able to determine the spatial variation of the Raman susceptibilities with high accuracy, and the results reveal a phase-breaking length L~40nm near the graphene edge.
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Taxonomy
TopicsGraphene research and applications · Carbon Nanotubes in Composites · Diamond and Carbon-based Materials Research