Band structures, nanowire

Ballistic transport, 191 Band structures, nanowire calculated subband energies as function of in-plane mass anisotropy, 188 carrier densities, 190-191 dispersion relation of electrons, 185 envelope wavefunction of electrons, 186 grid points transforming differential... 

Of the various semiconductors tested to date, Ti02 is the most promising photocatalyst because of its appropriate electronic band structure, photostability, chemical inertness and commercial availability. But currently, a variety of nanostmctured Ti02 with different morphologies including nanorods, nanowires, nanostmctured films or coatings, nanotubes, and mesoporous/nanoporous structures have attracted much attention. 

Nanowire systems have attracted a great deal of attention recently due to their technological potential They are of fundamental interest because they exhibit unique quantum confinement effects. In this article, advances in the fabrication of nanowires via template-assisted and laser-assisted approaches are reviewed. The structure and characteristics of different nanowire systems are discussed. To understand and predict the unusual properties of nanowires, we have developed a generalized theoretical model for the band structure of these onedimensional systems. A unique semimetal-semiconductor transition that occurs in bismuth nanowires is described. Transport measurements on bismuth and antimony nanowires illustrate that these novel materials are very different from their bulk counterparts. A transport... 

The electronic states of nanowire systems exhibit a very different spectrum from that of bulk materials. In order to understand their unique electronic properties, we have modeled the band structure of these one-dimensional systems. 

The transport properties of nanowires are of technological importance and have attracted significant attention in the recent years. Band structure gives simple solution to the analysis of the ballistic transport of periodic nanowires because the number of the bands crossing the Fermi surface is equal the number of quantum of conductance. However, the situation in nanocontacts is more complicated [112],... 

Pistol ME, Pryor CE (2008) Band structure of core-shell semiconductor nanowires. Phys Rev B 78 115319... 

We have performed ab initio calculations of electronic band structures of nonhydrogenated silicon nanowires in the <001>, <011>. <111> and <112> orientations. Our results clearly indicate that silicon nanowires with the <001>, <111> and <112> axes have turned out to be metallic, while the one with the <011> axis displays the semiconducting behavior. 

Figure 21. Band structure of an isolated silver nanowire (left-first), a silver nanowire encapsulated in a CQHQ nanotube (second), a CQHQ nanotube (third), and a CHQ nanotube (last). (Reproduced by permission of American Physical Society [191])...

To obtain insight into the electronic structure of the encapsulated silver nanowire, we evaluated its band structure and compared it, with both an isolated silver nanowire and the parent CHQ and CQHQ nanotubes (Figure 21). It can readily be noted that the CQHQ tube is a semiconductor with small gap (0.3 eV) compared to the insulating CHQ nanotube. The encapsulation of a silver nanowire within the CQHQ nanotube leads to several additional states in the band gap region and is somewhat different from that of an isolated silver... 

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