نتایج جستجو برای: zinc blende

تعداد نتایج: 73552  

Journal: :Physical review letters 2012
Guido A Intronati Pablo I Tamborenea Dietmar Weinmann Rodolfo A Jalabert

We identify the Dresselhaus spin-orbit coupling as the source of the dominant spin-relaxation mechanism in the impurity band of a wide class of n-doped zinc blende semiconductors. The Dresselhaus hopping terms are derived and incorporated into a tight-binding model of impurity sites, and they are shown to unexpectedly dominate the spin relaxation, leading to spin-relaxation times in good agreem...

2012
Michael Möller Alberto Hernández-Mínguez Steffen Breuer Carsten Pfüller Oliver Brandt Mauricio M de Lima Andrés Cantarero Lutz Geelhaar Henning Riechert Paulo V Santos

: The oscillating piezoelectric field of a surface acoustic wave (SAW) is employed to transport photoexcited electrons and holes in GaAs nanowires deposited on a SAW delay line on a LiNbO3 crystal. The carriers generated in the nanowire by a focused light spot are acoustically transferred to a second location where they recombine. We show that the recombination of the transported carriers occur...

2005
M. C. Qian C. Y. Fong W. E. Pickett J. E. Pask L. H. Yang

We examine theoretically ballistic conduction in thin layers of zinc blende half metals, considering as an example a superlattice consisting of monolayers of GaAs and MnAs, a bilayer of CrAs, and a bilayer of GaAs. By artificially separating bilayers, we show that surface states thwart half metallicity. However, capping the metal-As bilayers restores half metallicity, and ballistic conduction o...

2007
S. K. Pradhan Z. T. Deng F. Tang C. Wang V. Petkov

The three-dimensional structure of oleic acid-capped CdSe and thiol-capped CdTe nanocrystals used as quantum dots has been determined by total synchrotron radiation x-ray diffraction and atomic pair distribution function analysis. Both CdSe and CdTe are found to exhibit the zinc-blende-type atomic ordering. It is only slightly distorted in CdSe implying the presence of nanosize domains and very...

2012
David Holec Paul H. Mayrhofer

In this letter we present first-principles calculations of the surface energies of rock-salt (B1), zinc-blende (B3) and wurtzite (B4) AlN allotropes. Of several low-index facets, the highest energies are obtained for monoatomic surfaces (i.e. of only either Al or N atoms): [Formula: see text] and [Formula: see text]. The difference between Al- and N-terminated surfaces in these cases is less th...

2003
Dimitrie Culcer Allan MacDonald Qian Niu

We investigate the possibility of observing the anomalous Hall effect in paramagnetic two-dimensional systems. We apply the semiclassical equations of motion to carriers in the conduction and valence bands of wurtzite and zinc-blende quantum wells in the exchange field generated by magnetic impurities and we calculate the anomalous Hall conductivity based on the Berry phase corrections to the c...

2005
Dorian M. Hatch Harold T. Stokes Jianjun Dong Jesse Gunter Hao Wang James P. Lewis

We have theoretically investigated the mechanism of the pressure-induced reconstructive zinc-blende to rocksalt phase transition in SiC. We obtained 925 possible transition pathways sTPsd using a group-theoretical analysis method. This extensive survey of possible TPs is a significant feature which distinguishes this study from previous studies. Of these 925 TPs, we identified eight which have ...

2006
S. Raychaudhuri E. T. Yu

We employ a methodology, based on established approaches for determining the critical thickness for strain relaxation in planar films, to determine critical dimensions for coherently strained coaxial nanowire heterostructures. The model is developed and executed for various specific core-shell heterostructures in 111 zinc blende and 0001 wurtzite geometries. These calculations reveal that criti...

Journal: :The journal of physical chemistry. B 2005
Subhajit Biswas Soumitra Kar Subhadra Chaudhuri

Manganese-incorporated ZnS (MnxZn1-xS) nanorods were synthesized by a simple solvothermal process. Synthesized nanorods were single crystalline. Manganese incorporation in the ZnS lattice induces a phase transformation from hexagonal wurtzite to cubic zinc blende structure. The diameter of the nanorods increased with the increase of Mn concentration. Intense orange luminescence at approximately...

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