Open Access Open Access  Restricted Access Subscription or Fee Access

Quantum frequency transformer of radiation

Oleg V. Kondakov, Fidele Ndahayo


The paper aims to study the behavior of a quantum mechanical system consisting of a planar wave guide made of bismuth and bismuth - antimony alloys and located in a magnetic field up to 25 T. The electronic energy spectrum in crystals is quantized, and the ultra quantum limit is reached for magnetic field of about 2 T. The passage through the planar wave of a monochromatic infrared radiation with quantum energy of 119 meV results in electrons jumping to Landau levels located in the conduction band. The energy levels configuration allows for the spontaneous transitions of electrons from an upper highly populated Landau level to lower less populated Landau levels located in the conduction band. The energy gap between these levels correspond to a 4 – 10 THz frequency range. The magnetooptical oscillations have been observed in a broad band of temperatures from 80 to 280 K using crystals with antimony concentrations up to 20 atomic %. This happens because the electrons scattering process by phonons significantly decreases for systems located in a quantizing magnetic field as electrons can only dissipate on free from charge carriers Landau levels. The structure of a phonon spectrum for bismuth and bismuth – antimony alloys is such that in fields above ultra quantum limit the relaxation time will increase sharply together with Landau levels degeneracy. This results in resonance peaks in the magnetooptical spectrum.


Landau level, magnetooptical oscillations, semimetals, narrow band gap semiconductors

Full Text:


Disclaimer/Regarding indexing issue:

We have provided the online access of all issues and papers to the indexing agencies (as given on journal web site). It’s depend on indexing agencies when, how and what manner they can index or not. Hence, we like to inform that on the basis of earlier indexing, we can’t predict the today or future indexing policy of third party (i.e. indexing agencies) as they have right to discontinue any journal at any time without prior information to the journal. So, please neither sends any question nor expects any answer from us on the behalf of third party i.e. indexing agencies.Hence, we will not issue any certificate or letter for indexing issue. Our role is just to provide the online access to them. So we do properly this and one can visit indexing agencies website to get the authentic information. Also: DOI is paid service which provided by a third party. We never mentioned that we go for this for our any journal. However, journal have no objection if author go directly for this paid DOI service.