We report valence and conduction band densities of states measured via ultraviolet and inverse photoemission spectroscopies on three metal halide perovskites, specifically methylammonium lead iodide and bromide and cesium lead bromide (MAPbI3, MAPbBr3, CsPbBr3), grown at two different institutions on different substrates. These are compared with theoretical densities of states (DOS) calculated ...

PbSe is a pseudo-II-VI material distinguished from ordinary II-VI's (e.g., CdSe, ZnSe) by having both its valence band maximum (VBM) and its conduction band minimum (CBM) located at the fourfold-degenerate L-point in the Brillouin zone. It turns out that this feature dramatically affects the properties of the nanosystem. We have calculated the electronic and optical properties of PbSe quantum d...

1 G. Preparata [1] has stressed that when x becomes larger than a critical threshold, deuterons enter in a coherent oscillatory state. Deuterons while in the -phase (x<0.7 at room temperature), are confined in deep and narrow wells at definite lattice sites; this occurs since the d-shell electrons of Pd through their coherent oscillations produce stationary potential wells at these sites . It ...

Bilayer graphene is a highly promising material for electronic and optoelectronic applications since it is supporting massive Dirac fermions with a tunable band gap. However, no consistent picture of the gap's effect on the optical and transport behavior has emerged so far, and it has been proposed that the insulating nature of the gap could be compromised by unavoidable structural defects, by ...

The discovery of Dirac fermions in a number 2D and 3D materials boosted the solid-state research an unprecedented way. Among many hopes using their exceptional physical properties, it has been argued that reduced nonradiative losses would allow graphene to compete with quantum cascade lasers (QCLs) race for terahertz (THz) emitters. Unfortunately, Auger recombination (AR) process is still activ...

Metal–dithiolene complexes form very attractive categories of molecular metals and superconductors. They can have various oxidation states and can range from electron acceptors to donors. The first observation of metallic behavior in crystalline metal– dithiolene complexes was reported for Li0.75[Pt(mnt)2]?2H2O [mnt~maleonitriledithiolate; Scheme 1] by Underhill et al. in 1981. The conduction p...

Applying the Nakajima-Zwanzig method to the von Neumann equation of a system of interacting electrons and nuclei, etc., and evaluating the Pauli-Master equation according to RieckersStumpf, we obtain a system of reaction equations for electron-phonon-photon processes in a polar crystal. Further elaboration of these reaction equations leads to rate equations for electrons which include impurity ...

We have used admittance spectroscopy and deep-level transient spectroscopy to characterize electronic properties of Si/Si12x2yGexCy heterostructures. Band offsets measured by admittance spectroscopy for compressively strained Si/Si12x2yGexCy heterojunctions indicate that incorporation of C into Si12x2yGexCy lowers both the valenceand conduction-band edges compared to those in Si12xGex by an ave...

The structural, electronic, and optical properties of 12 multicomponent oxides with layered structure RAMO4, whereR3+ = In or Sc,A3+ =Al or Ga, andM2+ =Ca, Cd, Mg, or Zn, are investigated using first-principles density functional approach. The compositional complexity of RAMO4 leads to a wide range of band-gap values varying from 2.45 eV for InGaCdO4 to 6.29 eV for ScAlMgO4 as obtained from our...