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Reassessing Graphene Absorption and Emission Spectroscopy.

Yuan Yang, Grigory Kolesov, Lucas Kocia¹

¹Department of Physics, Tufts University , Medford, Massachusetts 02155, United States.

|September 6, 2017

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This study reinterprets graphene

Area of Science:

Condensed matter physics
Materials science
Optoelectronics

Background:

Understanding electron dynamics in graphene is crucial for optoelectronic applications.
Previous models often overlooked the role of phonon-assisted processes in graphene's optical response.

Purpose of the Study:

To propose a new framework for interpreting optical absorption and hot electron dynamics in graphene.
To elucidate the contributions of indirect and direct electronic transitions.

Main Methods:

Analysis of phonon-assisted indirect processes and direct process bleaching.
Theoretical calculations of indirect process magnitudes.
Comparison with experimental data on optical absorption and emission spectra.

Keywords:

Graphene UV−vis spectroscopy condensed matter spectroscopy optical absorption optical emission

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Main Results:

Indirect processes significantly contribute to excess UV absorption in graphene.
Observed ultrafast dynamics are explained by nascent electron distributions from indirect transitions, not rapid relaxation.
Phonon-assisted processes dominate fast emission spectra.

Conclusions:

A revised understanding of graphene's optical and electronic behavior is presented.
The importance of phonon-assisted transitions in ultrafast dynamics is highlighted.
This framework offers a more accurate interpretation of experimental observations.