Abstract
The high-frequency response of electrons in double quantum wells (DQWs) under an in-plane magnetic field is considered. The absorption, the Voigt effect and the transverse dipole moment due to electron transitions between tunnel-coupled levels are calculated for excitation by an electric field parallel to the 2D plane; the depolarization field, which is perpendicular to the 2D plane, is also taken into account. Strong modification of the intersubband absorption spectrum (the appearance of two absorption peaks, which demonstrate different collisionless broadening and shift) is found under increasing magnetic field. The spectral dependencies of the Voigt effect and induced dipole moment are calculated. Such dependencies are different in essence for small magnetic fields, for which both tunnel-coupled states are occupied; for intermediate magnetic fields, for which the Fermi level intersects the anticrossing gap; and for large fields, for which the electrons are localized in two valleys of the lowest level. Numerical estimates of these effects are presented for typical DQW structures.
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