Optical Measurement of the Phase-Breaking Length in Graphene

TL;DR

This paper introduces an optical method combining vibrational spectroscopy and defocusing to measure the phase-breaking length of electrons in graphene, revealing temperature-dependent coherence properties.

Contribution

It presents a novel optical approach to measure the phase-breaking length in graphene, aligning with prior magneto-transport results but using a different technique.

Findings

Measured $L_{\,phi}$ from Raman D band confinement.

Found $L_{\,phi} \,\propto \,1/\sqrt{T}$ across 1.55K to 300K.

Confirmed consistency with previous magneto-transport data.

Abstract

In mesoscopic physics, interference effects play a central role on the transport properties of conduction electrons, giving rise to exotic phenomena such as weak localization, Aharonov-Bohm effect, and universal conduction fluctuations. Mesoscopic objects have a size on the order of the {\em phase-breaking length} $L_{\phi}$, the length conduction electrons travel while keeping phase coherence. In this letter, we use vibrational spectroscopy in combination with a novel optical defocusing method to measure $L_{\phi}$ of photo-excited electrons in graphene which undergo inelastic scattering by optical phonons. We extract $L_{\phi}$ from the spatial confinement of the defect-induced Raman D band near the edges of graphene. Temperature dependent measurements in the range of 1.55\,K to 300\,K yield $L_{\phi} \propto 1/\sqrt{T}$, in agreement with previous magneto-transport measurements.