Emission spectroscopy on two-dimensional systems

Gornik, E.; Schawarz, R.; Lindemann, G.; Tsui, D. C.

doi:10.1016/0039-6028(80)90530-0

Cited by 14 publications

(4 citation statements)

References 25 publications

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“…Additionally, the form of the emission line can be also affected by the inhomogeneous broadening due to electron-phonon scattering 63 , as well the Stark broadening induced by ionized impurities 64 . The latter can be a dominant contribution into the emission linewidth as previously observed by Gornik et al 65 .…”

Section: Discussionsupporting

confidence: 73%

Terahertz cyclotron emission from two-dimensional Dirac fermions

et al. 2023

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Since the emergence of graphene, we have seen several proposals for the realization of Landau lasers tunable over the terahertz frequency range. The hope was that the non-equidistance of the Landau levels from Dirac fermions would suppress the harmful non-radiative Auger recombination. Unfortunately, even with this non-equidistance an unfavorable non-radiative process persists in Landau-quantized graphene, and so far no cyclotron emission from Dirac fermions has been reported. One way to eliminate this last non-radiative process is to sufficiently modify the dispersion of the Landau levels by opening a small gap in the linear band structure. A proven example of such gapped graphene-like materials are HgTe quantum wells close to the topological phase transition. In this work, we experimentally demonstrate Landau emission from Dirac fermions in such HgTe quantum wells, where the emission is tunable by both the magnetic field and the carrier concentration. Consequently, these results represent an advance in the realization of terahertz Landau lasers tunable by magnetic field and gate-voltage.

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Section: Discussionsupporting

confidence: 73%

Terahertz cyclotron emission from two-dimensional Dirac fermions

et al. 2023

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“…3. The most important requirement imposed on the grating is that it must be a quantum wire grating, but not a commonly employed [8][9][10][11][12][13] metal one. It is the resonant interaction of plasma modes in the 2DES and in the grating that allows one significantly to increase the amplification of light when using the higher 2D plasmon harmonics, and hence to reduce the threshold velocity of amplification.…”

Section: Discussionmentioning

confidence: 99%

“…This situation has been realized in experimental papers published so far. [8][9][10][11][12][13] In order to describe the emission spectrum using the formalism developed above one should include into the consideration the equilibrium black-body radiation around the system, and take into account that the sample has a higher temperature (T e ) than the environment (T 0 ). Taking into account that the sample reflects and transmits the incident black-body radiation with the intensity I bb (ω, T 0 ), and emits the radiation with the intensity A(ω, v dr )I bb (ω, T e ), 38 we obtain that the emitted radiation registered by an external device (filter) in the frequency interval between ω and ω + dω is given by 39…”

Section: Emission Of Wavesmentioning

confidence: 99%

“…First attempts to observe the emission of light from the grating coupled 2DES have been made in 1980. 8,9 In these FIR emission experiments (Fig.1, where the drift velocity v dr = 0, but the intensity of the incident light I 0 is zero) a strong dc current is passed through the 2D layer (in the x direction perpendicular to the grating strips), and the emitted electromagnetic radiation is registered. The grating period in these solid-state structures can be made smaller than 1 µm, and the typical frequency of 2D plasmons falls in the terahertz (FIR) range.…”

Section: Introductionmentioning

confidence: 99%

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Plasma instability and amplification of electromagnetic waves in low-dimensional electron systems

1998

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A general electrodynamic theory of a grating coupled two dimensional electron system (2DES) is developed. The 2DES is treated quantum mechanically, the grating is considered as a periodic system of thin metal strips or as an array of quantum wires, and the interaction of collective (plasma) excitations in the system with electromagnetic field is treated within the classical electrodynamics. It is assumed that a dc current flows in the 2DES. We consider a propagation of an electromagnetic wave through the structure, and obtain analytic dependencies of the transmission, reflection, absorption and emission coefficients on the frequency of light, drift velocity of 2D electrons, and other physical and geometrical parameters of the system. If the drift velocity of 2D electrons exceeds a threshold value, a current-driven plasma instability is developed in the system, and an incident far infrared radiation is amplified. We show that in the structure with a quantum wire grating the threshold velocity of the amplification can be essentially reduced, as compared to the commonly employed metal grating, down to experimentally achievable values. Physically this is due to a considerable enhancement of the grating coupler efficiency because of the resonant interaction of plasma modes in the 2DES and in the grating. We show that tunable far infrared emitters, amplifiers and generators can thus be created at realistic parameters of modern semiconductor heterostructures.

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Electrical properties of semiconductor surfaces

Kohl

1983

Appl. Phys. A

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Emission spectroscopy on two-dimensional systems

Cited by 14 publications

References 25 publications

Terahertz cyclotron emission from two-dimensional Dirac fermions

Terahertz cyclotron emission from two-dimensional Dirac fermions

Plasma instability and amplification of electromagnetic waves in low-dimensional electron systems

Electrical properties of semiconductor surfaces

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