Electrically pumped graphene-based Landau-level laser

Brem, Samuel; Wendler, Florian; Winnerl, Stephan; Malić, Ermin

doi:10.1103/physrevmaterials.2.034002

Cited by 9 publications

(9 citation statements)

References 32 publications

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“…The latter depopulate the lower laser level

n = + 1

and repopulate the initial LL

n = - 3

for optical excitation. Our calculations reveal that for a high‐quality cavity and sufficient pump power, the laser frequency can be externally tuned within a continuous range between 4 and 8.5 THz …”

Section: Population Inversionmentioning

confidence: 95%

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Carrier Dynamics in Graphene: Ultrafast Many‐Particle Phenomena

et al. 2017

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Graphene is an ideal material to study fundamental Coulomb-and phonon-induced carrier scattering processes. Its remarkable gapless and linear band structure opens up new carrier relaxation channels. In particular, Auger scattering bridging the valence and the conduction band changes the number of charge carriers and gives rise to a significant carrier multiplicationan ultrafast many-particle phenomenon that is promising for the design of highly efficient photodetectors. Furthermore, the vanishing density of states at the Dirac point combined with ultrafast phonon-induced intraband scattering results in an accumulation of carriers and a population inversion suggesting the design of graphene-based terahertz lasers. Here, we review our work on the ultrafast carrier dynamics in graphene and Landau-quantized graphene is presented providing a microscopic view on the appearance of carrier multiplication and population inversion.

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“…The latter depopulate the lower laser level

n = + 1

and repopulate the initial LL

n = - 3

Section: Population Inversionmentioning

confidence: 95%

“…A spectrally broad population inversion has been measured and theoretically predicted in the strong excitation regime. Recently, a population inversion in Landau‐quantized graphene has also been predicted suggesting the design of tunable terhertz Landau level lasers.…”

Section: Population Inversionmentioning

confidence: 99%

Carrier Dynamics in Graphene: Ultrafast Many‐Particle Phenomena

et al. 2017

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“…1b). However, to the best of our knowledge, no cyclotron emission, let alone the Landau level laser based on graphene, has been reported so far, despite pertinent theoretical predictions and numerous experimental attempts 10,[20][21][22][23][24][25][26] .…”

mentioning

confidence: 99%

“…Schrödinger electrons has been reported so far, despite pertinent theoretical predictions and numerous experimental attempts 10,[20][21][22][23][24][25][26] . This surprising lack of optical emission seems to be still a consequence of Auger scattering.…”

mentioning

confidence: 99%

Suppressed Auger scattering and tunable light emission of Landau-quantized massless Kane electrons

et al. 2019

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The Landau level laser has been proposed a long time ago as a unique source of monochromatic radiation, widely tunable in the THz and infrared spectral ranges using an externally applied magnetic field. In spite of decades of efforts, this appealing concept never resulted in the design of a reliable device. This is due to efficient Auger scattering of Landau-quantized electrons, which is an intrinsic non-radiative recombination channel that eventually gains over cyclotron emission in all materials studied so far: in conventional semiconductors with parabolic bands, but also in graphene with massless electrons. The Auger processes are favored in these systems by Landau levels (or their subsets) equally spaced in energy.Here we show that this scheme does not apply to massless Kane electrons in gapless HgCdTe alloy, in which undesirable Auger scattering is strongly suppressed and the sizeable cyclotron emission observed, for the first time in the case of massless particles. The gapless HgCdTe thus appears as a material of choice for future technology of Landau level lasers.

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“…It was also shown in Refs. , that the radiative recombination is negligible in the case of Landau‐quantized graphene. Taking into account Coulomb‐induced scattering channels including Auger processes, we find a further increase of the carrier density even after the pulse has been switched off (red line) –a CM takes place.…”

Section: Carrier Multiplication In Undoped Graphenementioning

confidence: 96%

Review on carrier multiplication in graphene

Malić

Winzer

Wendler

et al. 2016

Physica Status Solidi (b)

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The remarkable gapless and linear band structure of graphene opens up new carrier relaxation channels bridging the valence and the conduction band. These Auger scattering processes change the number of charge carriers and can give rise to a significant multiplication of optically excited carriers in graphene. This is an ultrafast many-particle phenomenon that is of great interest both for fundamental many-particle physics as well as technological applications. Here, we review the research on carrier multiplication in graphene and Landau-quantized graphene including theoretical modelling and experimental demonstration

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Electrically pumped graphene-based Landau-level laser

Cited by 9 publications

References 32 publications

Carrier Dynamics in Graphene: Ultrafast Many‐Particle Phenomena

Carrier Dynamics in Graphene: Ultrafast Many‐Particle Phenomena

Suppressed Auger scattering and tunable light emission of Landau-quantized massless Kane electrons

Review on carrier multiplication in graphene

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