Research output: Contribution to journal › Article › peer-review
Coherent Emission in the Vicinity of 10 THz due to Auger-Suppressed Recombination of Dirac Fermions in HgCdTe Quantum Wells. / Morozov, Sergey V.; Rumyantsev, Vladimir V.; Zholudev, Maksim S. et al.
In: ACS Photonics, Vol. 8, No. 12, 15.12.2021, p. 3526–3535.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Coherent Emission in the Vicinity of 10 THz due to Auger-Suppressed Recombination of Dirac Fermions in HgCdTe Quantum Wells
AU - Morozov, Sergey V.
AU - Rumyantsev, Vladimir V.
AU - Zholudev, Maksim S.
AU - Dubinov, Alexander A.
AU - Aleshkin, Vladimir Ya
AU - Utochkin, Vladimir V.
AU - Fadeev, Mikhail A.
AU - Kudryavtsev, Konstantin E.
AU - Mikhailov, Nikolay N.
AU - Dvoretskii, Sergey A.
AU - Gavrilenko, Vladimir I.
AU - Teppe, Frederic
N1 - Funding Information: The work was sponsored by Center of Excellence ≪Center of Photonics≫ funded by The Ministry of Science and Higher Education of the Russian Federation, contract no. 075-15-2020-906) Publisher Copyright: © 2021 American Chemical Society.
PY - 2021/12/15
Y1 - 2021/12/15
N2 - The discovery of Dirac fermions in a number of 2D and 3D materials boosted the solid-state research in an unprecedented way. Among the many hopes of using their exceptional physical properties, it has been argued that their reduced nonradiative losses would allow graphene to compete with quantum cascade lasers (QCLs) in the race for terahertz (THz) emitters. Unfortunately, the nonradiative Auger recombination (AR) process is still active for massless fermions in gapless graphene. However, for massive Dirac fermions, AR can be entirely suppressed below a certain threshold of the carrier's kinetic energy that depends on the nonparabolicity and the symmetry of the electron and hole dispersions. In this work, by finely tuning the band structure of HgCdTe quantum wells hosting massive Dirac fermions, we set the electronic system below this threshold and demonstrate that the carrier recombination is purely radiative. A coherent interband emission reaching 9.6 THz, that is to say outside the spectral range of current QCLs, is measured under these conditions, opening the way to lossless interband THz emitters.
AB - The discovery of Dirac fermions in a number of 2D and 3D materials boosted the solid-state research in an unprecedented way. Among the many hopes of using their exceptional physical properties, it has been argued that their reduced nonradiative losses would allow graphene to compete with quantum cascade lasers (QCLs) in the race for terahertz (THz) emitters. Unfortunately, the nonradiative Auger recombination (AR) process is still active for massless fermions in gapless graphene. However, for massive Dirac fermions, AR can be entirely suppressed below a certain threshold of the carrier's kinetic energy that depends on the nonparabolicity and the symmetry of the electron and hole dispersions. In this work, by finely tuning the band structure of HgCdTe quantum wells hosting massive Dirac fermions, we set the electronic system below this threshold and demonstrate that the carrier recombination is purely radiative. A coherent interband emission reaching 9.6 THz, that is to say outside the spectral range of current QCLs, is measured under these conditions, opening the way to lossless interband THz emitters.
KW - Auger recombination
KW - carrier lifetime
KW - long-wavelength lasers
KW - narrow gap materials
KW - stimulated emission
KW - terahertz radiation
UR - http://www.scopus.com/inward/record.url?scp=85120847645&partnerID=8YFLogxK
U2 - 10.1021/acsphotonics.1c01111
DO - 10.1021/acsphotonics.1c01111
M3 - Article
AN - SCOPUS:85120847645
VL - 8
SP - 3526
EP - 3535
JO - ACS Photonics
JF - ACS Photonics
SN - 2330-4022
IS - 12
ER -
ID: 34970099