期刊
NANOPHOTONICS
卷 10, 期 13, 页码 3497-3506出版社
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2021-0292
关键词
nano-lasers; nanoparticles; quantumdots; THz lasers; topological insulators; topological nanophotonics
资金
- Centre for Doctoral Training on Theory and Simulation of Materials at Imperial College London - EPSRC [EP/L015579/1]
- Spanish Ministerio de Economia y Competitividad [FIS2017-91413-EXP]
- Ministerio de Ciencia, Innovacion y Universidades through the grant MELODIA [PGC2018-095777-B-C21]
- European Union under the European Regional Development Fund
- European Union [857543]
- Foundation for Polish Science [MAB/2020/14]
Topological quantum dots can serve as a new platform for THz lasing with low energy threshold and slow time scales, enabling room-temperature THz lasing pumped via blackbody radiation.
Topological quantum dots (TQDs) are 3D topological insulator (TI) nanoparticles, displaying symmetry-protected surface states with discretized energies. We present a theoretical proposal to harness these energy levels in a closed lasing scheme operating in the terahertz (THz) frequency range. In this scheme, a single TQD lases from its topological surface states in the THz regime when pumped with low intensity, incoherent THz frequency light. The time scales associated with the system are unusually slow, and we find that lasing occurs with a very low threshold. THz lasers are often bulky or require intricately engineered nanostructures. Topological quantum dots present a new, compact and simple platform for THz lasing. The lasing threshold is so low, we predict that the room-temperature blackbody radiation can substantially contribute to population inversion, providing a route to room-temperature THz lasing pumped via blackbody radiation.
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