Ultrafast sublattice pseudospin relaxation in graphene probed by 
polarization-resolved photoluminescence

Danz, T.; Neff, A.; Gaida, J.H.; Bormann, R.; Ropers, Claus; Schäfer, S.

doi:10.1103/PhysRevB.95.241412

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Ultrafast sublattice pseudospin relaxation in graphene probed by polarization-resolved photoluminescence

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Ropers, Claus
Department of Ultrafast Dynamics, MPI for Biophysical Chemistry, Max Planck Society;

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Citation

Danz, T., Neff, A., Gaida, J., Bormann, R., Ropers, C., & Schäfer, S. (2017). Ultrafast sublattice pseudospin relaxation in graphene probed by polarization-resolved photoluminescence. Physical Review B, 95(24): 241412(R). doi:10.1103/PhysRevB.95.241412.

Cite as: https://hdl.handle.net/21.11116/0000-000B-5DDF-3

Abstract

Electronic pseudospin degrees of freedom in two-dimensional materials exhibit unique carrier-field interactions which allow for advanced control strategies. Here, we investigate ultrafast sublattice pseudospin relaxation in graphene by means of polarization-resolved photoluminescence spectroscopy. A comparison with microscopic Boltzmann simulations allows us to determine a lifetime of the optically aligned pseudospin distribution of 12±2fs. This experimental approach extends the toolbox of graphene pseudospintronics, providing additional means to investigate pseudospin dynamics in active devices or under external fields.