Polarized photoluminescence clocks ultrafast pseudospin relaxation in graphene

Electronic states in 2D materials can exhibit pseudospin degrees of freedom, which allow for unique carrier-field interaction scenarios. Here, we investigate ultrafast sublattice pseudospin relaxation in graphene by means of polarization-resolved photoluminescence spectroscopy. Comparison with micro...

Full description

Saved in:
Bibliographic Details
Published in:arXiv.org 2017-02
Main Authors: Danz, Thomas, Neff, Andreas, Gaida, John H, Bormann, Reiner, Ropers, Claus, Schäfer, Sascha
Format: Article
Language:English
Subjects:
Clocks
Electron states
Graphene
Photoluminescence
Two dimensional materials
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Electronic states in 2D materials can exhibit pseudospin degrees of freedom, which allow for unique carrier-field interaction scenarios. Here, we investigate ultrafast sublattice pseudospin relaxation in graphene by means of polarization-resolved photoluminescence spectroscopy. Comparison with microscopic Boltzmann simulations allows to determine a lifetime of the optically aligned pseudospin distribution of \(12\pm 2\,\text{fs}\). This experimental approach extends the toolbox of graphene pseudospintronics, providing novel means to investigate pseudospin dynamics in active devices or under external fields.
ISSN:2331-8422
DOI:10.48550/arxiv.1702.00962