arXiv subjects

A. A. Farajian

Publications and source records attributed to A. A. Farajian.

3 recordsLinked to original sources

arXiv2010

Hydrogen Compounds of Group-IV Nanosheets

The structural and electronic properties of the hydrides of silicene and germanene have been studied using ab initio calculations. The trend for the M-H (M=C, Si, Ge) bond lengths, and corresponding bond energies, is consistent with the atomic size trend, and comparable to those of MH_4 hydrides. Band structures were also obtained for the buckled configuration, which is the stable form for both silicene and germanene. Upon hydrogenation, both silicane (indirect gap) and germanane (direct gap) are semiconducting.

cond-mat.mtrl-sci↗

arXiv2003

Vacuum polarization in nanotubes

This paper has been withdrawn by the author due to a crucial error.

cond-mat.str-el↗

arXiv2003

Effective Screening of Localized Charged Perturbations in Metallic Nanotubes: Roles of Massive Bands

The massive-band effects on screening behavior of metallic carbon nanotubes are theoretically investigated using two different methods; continuous and lattice quantum theories. Both approaches show screening of a localized external perturbation with an effective screening length of the order of the nanotube diameter. Calculating the nonlinear deformation of the local density of states near the charged perturbation, we show that the perturbative effects of the massive bands are effectively canceled by direct massive band interactions, such that a good agreement between the two methods can be achieved. The effective screening is important in nanoscale integration of nanotube-based electronic devices.

cond-mat.str-el↗