Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optical Measurement of the Phase-Breaking Length in Graphene   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.

8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
2
The categories of this paper are: math
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin