Ms. Kushwaha, THEORY OF ELEMENTARY EXCITATIONS OF THE MAGNETOPLASMA IN SEMIINFINITEN-I-P-I SUPERLATTICES, Philosophical magazine. B. Physics of condensed matter. Structural, electronic, optical and magnetic properties, 69(3), 1994, pp. 471-489
A theoretical investigation has been made of the collective (bulk and
surface) excitations in a semi-infinite superlattice system made up of
n- and p-type doped semiconductors separated by an undoped intrinsic
(i) semiconductor (n-i-p-i superstructure). An external magnetic field
is assumed to be oriented perpendicular to the interfaces and to the
direction of propagation. The thicknesses of the constituent layers ar
e assumed to be sufficiently large that quantum-size effects can be ig
nored. The material layers are characterized by frequency- and magneti
c-field-dependent dielectric functions. The magnetoplasma modes are de
fined by electromagnetic fields that are localized at and decay expone
ntially away from the interfaces and from the end of the superstructur
e. The general dispersion relations are derived using a fully retarded
theory in the framework of a transfer-matrix method. Numerical exampl
es, both with and without an applied magnetic field, are presented for
several illustrative cases.