Efficient Auger scattering in Landau-quantized graphene

Wendler, Florian; Funk, Hannah; Mittendorff, Martin; Winnerl, Stephan; Helm, M.; Knorr, Andreas; Malić, Ermin

doi:10.1117/12.2075458

Cited by 2 publications

(2 citation statements)

References 51 publications

(49 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(24), we have microscopic access to the absorption spectrum of Landau-quantized graphene exhibiting pronounced peaks for the optically excited inter-LL transitions. Within the RWA, σ + -polarized radiation excites transitions with n → n + 1, while σ − -polarized light induces transitions with n → n − 1 [39]. The absorption peaks have a Lorentzian shape in Eq.…”

Section: B Absorption Spectramentioning

confidence: 99%

Microscopic view on Landau level broadening mechanisms in graphene

Funk¹,

Knorr²,

Wendler

et al. 2015

Phys. Rev. B

View full text Add to dashboard Cite

Placing a two-dimensional sheet of graphene in an external magnetic field the continuous electronic band structure is discretized due to Landau quantization. The resulting optical transitions are subject to a broadening, which can lead to a significant overlap of Landau levels. We investigate the possible microscopic processes that could cause a broadening of the corresponding peaks in the absorption spectrum of Landau-quantized graphene: (i) radiative decay, (ii) Coulomb interaction, (iii) optical phonons, (iv) acoustic phonons, and (v) impurities. Since recent experiments have shown that independent of the magnetic field the resolvable number of Landau levels is constant, we put a special focus on the dependence of the broadening on the external magnetic field B and the Landau level index n. Our calculations reveal the impurities to be the crucial broadening mechanism, where different regimes of well separated and densely spaced Landau levels need to be taken into account. Furthermore, carrier-carrier and carrier-phonon scattering give rise to a very specific dependence on the Landau level index n that has not been observed yet.

show abstract

Section: B Absorption Spectramentioning

confidence: 99%

Microscopic view on Landau level broadening mechanisms in graphene

Funk¹,

Knorr²,

Wendler

et al. 2015

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…Having the knowledge of the temporal evolution of the occupation probabilities, we can also calculate the differential transmission spectrum (DTS) that is directly accessible in pump-probe experiments. For a linearly polarized probe pulse of the frequency ω that is incident with a temporal delay of τ after the pump pulse (with the same energy and polarization), we obtain [23] …”

Section: B Differential Transmission Spectrummentioning

confidence: 99%

Doping-dependent intraband carrier dynamics in Landau-quantized graphene

Wendler

Malić

2016

Phys. Rev. B

View full text Add to dashboard Cite

We investigate the intraband carrier dynamics in Landau-quantized graphene after an optical excitation with low-energetic terahertz pulses. Based on a microscopic theory, we calculate time-dependent differential transmission spectra reflecting the Landau-level dynamics. Our calculations reveal a strong dependence on the Fermi energy E F of the graphene sample as well as on the applied magnetic field B. We find that the pump pulse can lead to both absorption bleaching and absorption enhancement depending on B and the position of E F with respect to the resonant Landau-level transition. As a result, positive and negative contributions in differential transmission spectra appear, in good agreement with recent pump-probe measurements.

show abstract

Efficient Auger scattering in Landau-quantized graphene

Cited by 2 publications

References 51 publications

Microscopic view on Landau level broadening mechanisms in graphene

Microscopic view on Landau level broadening mechanisms in graphene

Doping-dependent intraband carrier dynamics in Landau-quantized graphene

Contact Info

Product

Resources

About