Photoconductivity in GaAlAs:Si Proves Negative U of DX Centers

Trion-Induced Negative Photoconductivity in Monolayer

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Trion-induced negative photoconductivity in monolayer MoS2.

Optical excitation typically enhances electrical conduction and low-frequency radiation absorption in semiconductors. We, however, observe a pronounced transient decrease of conductivity in doped monolayer molybdenum disulfide (MoS(2)), a two-dimensional (2D) semiconductor, using ultrafast optical-pump terahertz-probe spectroscopy. In particular, the conductivity is reduced to only 30% of its e...

DX centers in AlAs and GaAs-AlAs selectively doped superlattices

Dx centers have been investigated using deep level transient

Electron Paramagnetic Resonance studies of negative-U centers in AlGaN and SiC

Localized vibrational modes in GaN:O tracing the formation of oxygen DX-like centers under hydrostatic pressure

Vibrational modes are observed at ambient pressure in O-doped GaN at 544 cm using Raman spectroscopy. Investigation of these modes with applied hydrostatic pressure reveals the existence of three closely spaced modes that shift in relative intensity with increasing pressure. Notably, transitions between the different modes occur at previously observed electronic transitions associated with the ...