Collisional Lifetimes of Elementary Excitations in Two-Dimensional Systems in the Field of a Strong Electromagnetic Wave

A two-dimensional system with two nonequivalent valleys in the field of a strong circularly polarized electromagnetic wave is considered. It is assumed that the optical selection rules for a given polarization of light allow band-to-band transitions only in valleys of one, optically active, type (tw...

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Bibliographic Details
Published inJETP letters Vol. 107; no. 3; pp. 182 - 185
Main Author Kovalev, V. M.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.04.2018
Springer Nature B.V
Subjects
Atomic
Biological and Medical Physics
Biophysics
Condensed Matter
Electron gas
Electrons
Elementary excitations
Hybrid systems
Molecular
Optical activity
Optical and Plasma Physics
Particle and Nuclear Physics
Physics
Physics and Astronomy
Quantum Information Technology
Solid State Physics
Spintronics
Valleys
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Summary:A two-dimensional system with two nonequivalent valleys in the field of a strong circularly polarized electromagnetic wave is considered. It is assumed that the optical selection rules for a given polarization of light allow band-to-band transitions only in valleys of one, optically active, type (two-dimensional layer based on transition metal dichalcogenides, gapped graphene, etc.). This leads to the formation of photon-coupled electron–hole pairs, or an “optical insulator” state. It is assumed that the valleys of the second type (optically inactive) are populated with an equilibrium electron gas. The relaxation of elementary excitations in this hybrid system consisting of an electron gas and a gas of electron–hole pairs caused by the Coulomb interaction between the particles is investigated.
ISSN:0021-3640
1090-6487
DOI:10.1134/S0021364018030098