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Hot‐Phonon Effects on Millimeter and Submillimeter Wave Response of Two‐Dimensional Hot Electrons in GaAs Quantum Wells
Author(s) -
Sarkar S. K.,
Ghosh P. K.,
Chattopadhyay D.
Publication year - 1998
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199805)207:1<125::aid-pssb125>3.0.co;2-5
Subject(s) - phonon , electron , degenerate energy levels , condensed matter physics , hot electron , quantum well , physics , ionization , impurity , millimeter , atomic physics , lattice (music) , materials science , optics , ion , quantum mechanics , laser , acoustics
Abstract Small‐signal ac transport of degenerate two‐dimensional hot electrons in GaAs quantum wells is studied for lattice temperatures of 77 and 300 K including deformation potential, acoustic, polar optical and ionized impurity scatterings. The consideration of nonequilibrium optical phonons or hot phonons is found to enhance considerably the 3 dB cut‐off frequency ( f 3 dB ), where the ac mobility μ ac falls to 0.707 of its low‐frequency value. f 3 dB is shown here to decrease with increasing channel width, and to initially decrease and then rise slowly with increasing carrier concentration.