%0 Journal Article
%T Terahertz cyclotron emission from two-dimensional Dirac fermions
%+ Laboratoire Charles Coulomb (L2C)
%+ Institut d’Electronique et des Systèmes (IES)
%+ Modélisation et Spectroscopie THz (MOST)
%+ Capteurs et Instrumentations (CI)
%+ Matériaux (MAT)
%+ Photonique et Ondes (PO)
%+ Laboratoire national des champs magnétiques intenses - Grenoble (LNCMI-G )
%+ Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information (CEA-LETI)
%+ Institute for Physics of Microstructures, Russian Academy of Sciences, 603095 Nizhny Novgorod, GSP-105, Russia
%+ A.V. Rzhanov Institute of Semiconductor Physics
%A Gebert, S.
%A Consejo, C.
%A Krishtopenko, S.
%A Ruffenach, S.
%A Szola, M.
%A Torres, J.
%A Bray, C.
%A Jouault, Benoit
%A Orlita, M.
%A Baudry, X.
%A Ballet, P.
%A Morozov, S.
%A Gavrilenko, V.
%A Mikhailov, N.
%A Dvoretskii, S.
%A Teppe, F.
%Z The Ministry of Science and Higher Education of the Russian Federation (contract no. 075-15-2022-316)
%< avec comité de lecture
%@ 1749-4885
%J Nature Photonics
%I Nature Publishing Group
%V 17
%P 244–249
%8 2023
%D 2023
%Z 2301.05942
%R 10.1038/s41566-022-01129-1
%Z Physics [physics]/Physics [physics]/Optics [physics.optics]Journal articles
%X 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 unfavourable 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. HgTe quantum wells close to the topological phase transition are a proven example of such gapped graphene-like materials. 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 a magnetic field and gate voltage.
%G English
%2 https://hal.science/hal-03940773/document
%2 https://hal.science/hal-03940773/file/2301.05942.pdf
%L hal-03940773
%U https://hal.science/hal-03940773
%~ CEA
%~ UNIV-TLSE3
%~ UGA
%~ CNRS
%~ INSA-TOULOUSE
%~ IES
%~ OPENAIRE
%~ L2C
%~ DRT
%~ UNIV-MONTPELLIER
%~ LNCMI
%~ LETI
%~ CEA-GRE
%~ UGA-EPE
%~ ANR
%~ UNIV-UT3
%~ UT3-INP
%~ UT3-TOULOUSEINP
%~ UM-2015-2021
%~ UM-EPE