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Resonant absorption of terahertz electromagnetic waves by heated electrons in AlGaAs/GaAs heterostructures

Journal Article


Abstract


  • In this letter, we propose a mechanism which may cause a strong absorption of terahertz (THz) electromagnetic radiation in AlGaAs/GaAs-based two-dimensional semiconductor systems. In such systems, the rate of electronic transitions via hot electrons interacting with impurities and phonons is on the scale of 1012 s-1 so that the THz radiation will modify strongly the processes of electron momentum and energy relaxation and, consequently, a resonant absorption of the THz electromagnetic wave may occur. We find that in these sample systems, the absorption of the electromagnetic radiation at different frequencies can be tuned by heating the electrons to different temperatures. Our results can be used for understanding and interpreting the experimental results reported very recently. © 1996 American Institute of Physics.

Publication Date


  • 1996

Citation


  • Xu, W., & Zhang, C. (1996). Resonant absorption of terahertz electromagnetic waves by heated electrons in AlGaAs/GaAs heterostructures. Applied Physics Letters, 68(23), 3305-3307. doi:10.1063/1.116582

Scopus Eid


  • 2-s2.0-2542518553

Start Page


  • 3305

End Page


  • 3307

Volume


  • 68

Issue


  • 23

Abstract


  • In this letter, we propose a mechanism which may cause a strong absorption of terahertz (THz) electromagnetic radiation in AlGaAs/GaAs-based two-dimensional semiconductor systems. In such systems, the rate of electronic transitions via hot electrons interacting with impurities and phonons is on the scale of 1012 s-1 so that the THz radiation will modify strongly the processes of electron momentum and energy relaxation and, consequently, a resonant absorption of the THz electromagnetic wave may occur. We find that in these sample systems, the absorption of the electromagnetic radiation at different frequencies can be tuned by heating the electrons to different temperatures. Our results can be used for understanding and interpreting the experimental results reported very recently. © 1996 American Institute of Physics.

Publication Date


  • 1996

Citation


  • Xu, W., & Zhang, C. (1996). Resonant absorption of terahertz electromagnetic waves by heated electrons in AlGaAs/GaAs heterostructures. Applied Physics Letters, 68(23), 3305-3307. doi:10.1063/1.116582

Scopus Eid


  • 2-s2.0-2542518553

Start Page


  • 3305

End Page


  • 3307

Volume


  • 68

Issue


  • 23