We have studied terahertz ~THz! emission from InAs and GaAs in a magnetic field, and find that the emitted radiation is produced by coupled cyclotron-plasma charge oscillations. Ultrashort pulses of THz radiation were produced at semiconductor surfaces by photoexcitation with a femtosecond Ti-sapphire laser. We recorded the integrated THz power and the THz emission spectrum as a function of mag...

Intrinsic photogeneration of charge carriers in anthracene .1-4 single crystals occurs with photon energies in excess of 4 eV The mechanism of this process, however, is not well understood. The interpretation of the wavelength dependence of this current in 2 £\ particular is difficult. Two maxima in the photocurrent appear, <sJLJ one at 4.4 eV ' ' and the other at 5.4 eV. The 4.4 eV maximum app...

The article briefly describes the fire and explosion properties of coal raw materials (hard different grades). relevance problem is shown on example incidents occurring during transportation by modes transport. issues bulk are considered in more detail. paper aims at determining kinetic parameters low-temperature oxidation processes leading to self-heating and/or spontaneous combustion coal, op...

discontinuity induced two-dimensional electron gas at ZnO/Zn(Mg)O interfaces: A first-principles study" (2013). Evgeny Tsymbal Publications. 63. The discovery of a high-mobility two-dimensional electron gas (2DEG) in wurtzite ZnO/Zn(Mg)O heterostructures is promising for applications due to the high mobility of the carriers. In this paper, we study the formation and properties of the 2DEG at Zn...

Modulation of resistance by an external magnetic field, i.e. magnetoresistance effect, has been a long-lived theme of research due to both fundamental science and device applications. Here we report colossal positive magnetoresistance (CPMR) (>30,000% at a temperature of 2 K and a magnetic field of 9 T) discovered in degenerate semiconducting strontium titanite (SrTiO3) single crystals capped w...

Early research on C60 led to the discovery that the absorption of photons with energy greater than 2.35 eV by bulk C60 produces free charge carriers at room temperature. We find that not only is this also true for many of the soluble fullerene derivatives commonly used in organic photovoltaics, but also that the presence of these free carriers has significant implications for the modeling, char...

In previous work it has been shown that the traditional approach to transport phenomena in bipolar semiconductors is inconsistent. In particular, the effect of non-equilibrium charge carriers and appropriate boundary conditions are not considered in the literature. We have proposed an alternative for linear transport but some effects due to the relationship between the fluctuations in the densi...

© 2014 Materials Research Society MRS BULLETIN • VOLUME 39 • OCTOBER 2014 • www.mrs.org/bulletin Introduction Topological insulators (TIs) are a class of materials where the bulk is a band insulator, but the surface possesses electronic states carrying electric current. 1 , 2 One unique characteristic of the surface bands is the spin-momentum locking property—electrons have a single spin state ...