Terahertz Quasiparticle Acceleration: From Electron-Hole Collisions To Lightwave Valleytronics
2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)(2018)
摘要
Intense lightwaves can accelerate quasiparticles inside solids. This strong-field light-matter interaction results in the emission of high-harmonic or high-order sideband radiation. While the former process relies on a complex coupling between simultaneously driven interband polarization and intraband currents, high-order sidebands originate from a ballistic acceleration of the quasiparticles within the bands. This mechanism allows for the implementation of a quasiparticle collider in order to study those entities in close analogy to conventional collision experiments. Accelerating electrons and holes in a monolayer of transition metal dichalcogenides extends this scheme to internal quantum degrees of freedom. Our experiments show a lightwave-indu-ced switching of the valley pseudospin, paving the way to ultimately fast valleytronics.
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关键词
complex coupling,intraband currents,ballistic acceleration,transition metal dichalcogenides,ultimately fast valleytronics,terahertz quasiparticle acceleration,electron-hole collisions,lightwave valleytronics,solids,high-order sideband radiation,interband polarization,strong-field light-matter interaction,lightwave-induced switching,terahertz quasiparticle collider,monolayer,internal quantum degrees of freedom,valley pseudospin,high-harmonic radiation
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