Modulation doping of transition metal dichalcogenide/oxide heterostructures

Band offsets in transition-metal oxide heterostructures

We measured valence band offsets in Ta2O5–WO3, Ta2O5–Nb2O5 and WO3–Nb2O5 heterostructure couples by in situ x-ray photoelectron spectroscopy, immediately following the bi-layer growth in ultra-high vacuum. Conduction band offsets were estimated using the measured valence band offsets in conjunction with the literature values for the respective band gaps. The offsets between Ta2O5 and WO3 and be...

Spin doping using transition metal phthalocyanine molecules

Molecular spins have become key enablers for exploring magnetic interactions, quantum information processes and many-body effects in metals. Metal-organic molecules, in particular, let the spin state of the core metal ion to be modified according to its organic environment, allowing localized magnetic moments to emerge as functional entities with radically different properties from its simple a...

Atomic-scale Modeling of Transition-metal Doping of Semiconductor Nanocrystals

Stoichiometry-driven metal-to-insulator transition in NdTiO3/SrTiO3 heterostructures

Tightly Bound Trions in Transition Metal Dichalcogenide Heterostructures.

We report the observation of trions at room temperature in a van der Waals heterostructure composed of MoSe2 and WS2 monolayers. These trions are formed by excitons excited in the WS2 layer and electrons transferred from the MoSe2 layer. Recombination of trions results in a peak in the photoluminescence spectra, which is absent in monolayer WS2 that is not in contact with MoSe2. The trion origi...