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Ultrafast carrier dynamics in Landau-quantized graphene

Florian Wendler (Institutionen för teknisk fysik, Kondenserade materiens teori) ; Andreas Knorr ; Ermin Malic (Institutionen för teknisk fysik, Kondenserade materiens teori)
Nanophotonics (2192-8606). Vol. 4 (2015), 1, p. 224-249.
[Artikel, refereegranskad vetenskaplig]

In an external magnetic field, the energy of massless charge carriers in graphene is quantized into non-equidistant degenerate Landau levels including a zero-energy level. This extraordinary electronic dispersion gives rise to a fundamentally new dynamics of optically excited carriers. Here, we review the state of the art of the relaxation dynamics in Landau-quantized graphene focusing on microscopic insights into possible many-particle relaxation channels.We investigate optical excitation into a non equilibrium distribution followed by ultrafast carrier- carrier and carrier-phonon scattering processes. We reveal that surprisingly the Auger scattering dominates the relaxation dynamics in spite of the non-equidistant Landau quantization in graphene. Furthermore, we demonstrate how technologically relevant carrier multiplication can be achieved and discuss the possibility of optical gain in Landau-quantized graphene. The provided microscopic view on elementary many-particle processes can guide future experimental studies aiming at the design of novel graphene-based optoelectronic devices, such as highly efficient photodetectors, solar cells, and spectrally broad Landau level lasers.

Nyckelord: graphene



Denna post skapades 2015-11-24. Senast ändrad 2016-08-19.
CPL Pubid: 226248

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Kondenserade materiens teori (1900-2015)

Ämnesområden

Atom- och molekylfysik och optik
Nanoteknik

Chalmers infrastruktur

 


Projekt

Denna publikation är ett resultat av följande projekt:


Graphene-Based Revolutions in ICT And Beyond (GRAPHENE) (EC/FP7/604391)