Abstract
We report experimental measurements and computer calculations of the plasmon resonances of two dimensional electron gases in the far-infrared which show the effects of laterally drifting the 2DEG. Coupling to radiation is achieved using an overlaid metal grating of submicron period, and its periodic screening effect splits the plasmon into upper and lower energy modes. For a symmetric grating profile the higher energy mode is non-radiative for a stationary 2DEG and a splitting is not observable, but when the 2DEG is laterally drifted under the grating, coupling to both modes can occur, and their Doppler shifts produce an observable splitting which increases with drift velocity. These Doppler shifts are not linear with drift velocity for low velocities, but approach asymptotically the expected linear shift with increasing drift velocity. Experimental results on 2DEGs at GaAs/AlGaAs heterojunctions compare well with theoretical calculations.
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References
Ando T, Fowler A B and Stern F,Rev Mod Phys 54, 437 (1982)
Batke E and Heitmann D,Infrared Phys 24, 189 (1984)
Heitmann D,Electronic Properties of Multilayers and Low-Dimensional Semiconductor Structures, 151–173, Ed: Chamberlain J M et al, Plenum Press, New York (1990)
Stern F,Phys Rev Lett 18, 546 (1967)
Chen J, Kempa K and Bakshi P,Phys Rev B 38, 10051 (1988)
Gupta R and Ridley B K,Phys Rev B 39, 6208 (1989)
Steele M C,Wave Interactions in Solid State Plasmas, McGraw-Hill Book Company, New York (1969)
Chaplik A V,Solid State Commun 65, 1589 (1988)
Allen S J, Tsui D C and Logan R A,Phys Rev Lett 38, 980 (1977)
Ager C D and Hughes H P,Solid State Commun 83, 627 (1992)
Ager C D, Wilkinson R J and Hughes H P,J Appl Phys 71, 1322 (1992)
Theis T N,Surf Sci 98, 515 (1980)
Ager C D and Hughes H P,Phys Rev B 44, 13452 (1991)
Das Sarma S and Stern F,Phys Rev B 32, 8442 (1985)
Mackens Uet al, Phys Rev Lett 53, 1485 (1984)
Zettler T and Kotthaus J P,Semicond Sci Technol 3, 413 (1988)
Allen S Jet al, Physica 134 B, 332 (1985)
Drummond T Jet al, Electronics Letters 17, 545 (1981)
Masselink W T,Semicond Sci Technol 4, 503 (1989)
Tsubaki Ket al, Solid State Commun 46, 517 (1983)
Schubert E F and Ploog K,Appl Phys A 33, 183 (1984)
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Tyson, R.E., Stuart, R.J., Hughes, H.P. et al. Non-linear Doppler shift of the plasmon resonance in a grating-coupled drifting 2DEG. Int J Infrared Milli Waves 14, 1237–1249 (1993). https://doi.org/10.1007/BF02146254
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DOI: https://doi.org/10.1007/BF02146254