Spin-dependent terahertz nonlinearities at inter-valence-band absorption in p-Ge
نویسندگان
چکیده
منابع مشابه
Broad band p-Ge optical amplifier of terahertz radiation
A solid state broad band amplifier of terahertz radiation ~1.5–4 THz!, based on intersubband transitions of hot holes in p-Ge is demonstrated. The gain is investigated as a function of applied magnetic and electric fields by transmission measurements using a laser system with two p-Ge active crystals, when one operates as an oscillator and one as an amplifier. A peak gain higher than usually re...
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We study the influence of the junction size in ferromagnet (FM)/semiconductor (SC) contacts on four-terminal nonlocal spin signals in SC-based lateral spin-valve (LSV) structures. When we use FM/Ge Schottky-tunnel junctions with relatively low resistance-area products, the magnitude of the nonlocal spin signal depends clearly on the junction size, indicating the presence of the spin absorption ...
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Transitions between valence subbands resulting from hole-hole scattering in cubic semiconductors have been analyzed in the frame of Coulomb interaction of valence electrons in the Luttinger-Kohn representation. Expressions for transition rates are derived. Calculated rates for transitions between lightand heavy-hole bands are presented for germanium. Hole-hole scattering has remarkably differen...
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The contributions of inter-valence band (IVB) transitions to the dielectric function (DF) by free holes among the split-off (so), light-hole (lh) and heavy-hole (hh) bands were investigated. A model was developed to determine the DF of two p-type semiconductors, GaAs and Ge1 ySny with the Zinc-blend and Diamond crystal structures, respectively. The IVB transitions dominate the spectral range be...
متن کاملA discussion on molecular absorption noise in the terahertz band
This paper focuses on molecular absorption noise caused by molecular absorption in the higher frequency bands, such as THz band (0.1–10 THz). This transmission induced noise has been predicted to exist in the THz band, since the conservation of energy requires the conservation of the absorbed energy in the medium. There exist multiple models for the molecular absorption noise. Most of them focu...
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ژورنال
عنوان ژورنال: Physica B: Condensed Matter
سال: 1999
ISSN: 0921-4526
DOI: 10.1016/s0921-4526(99)00321-x