Zobrazeno 1 - 10
of 107
pro vyhledávání: '"Behera, S N"'
The Raman spectra of two G-bands and a radial breathing mode (RBM) of unfilled and filled single-wall semiconducting and metallic carbon nanotubes have been investigated theoretically, in the presence of electron-phonon and phonon-phonon interactions
Externí odkaz:
http://arxiv.org/abs/0710.0524
Autor:
Reddy, G. Gangadhar, Ramakanth, A., Ghatak, S. K., Behera, S. N., Nolting, W., Rao, T. Venkatappa
A model calculation is presented with the aim to study the interplay between magnetic and structural transitions. The model consists of an orbitally doubly degenerate conduction band and a periodic array of local moments. The band electrons interact
Externí odkaz:
http://arxiv.org/abs/cond-mat/0609536
The electronic properties of one-dimensional clusters of N atoms or molecules have been studied. The model used is similar to the Kronig-Penney model with the potential offered by each ion being approximated by an attractive delta function. The energ
Externí odkaz:
http://arxiv.org/abs/cond-mat/0608175
Publikováno v:
Phys. Rev. B 72, 153402 (2005)
The tangential G-band in the Raman spectra of a metallic single-wall carbon nanotube shows two peaks: a higher frequency component having the Lorentzian shape and a lower-frequency component of lower intensity with a Breit-Wigner-Fano (BWF)-type line
Externí odkaz:
http://arxiv.org/abs/cond-mat/0506004
A model study for the coexistence of the spin density wave and superconductivity is presented. With reference to the recent angle resolved photo emmission experimental data in high T_c cuprates, presence of the nested pieces of bands is assumed. The
Externí odkaz:
http://arxiv.org/abs/cond-mat/9903234
The co-existence of band Jahn-Teller (BJT) effect with superconductivity (SC) is studied for correlated systems, with orbitally degenerate bands using a simple model. The Hubbard model for a doubly degenerate orbital with the on-site intraorbital Cou
Externí odkaz:
http://arxiv.org/abs/cond-mat/9802072
The role of electron correlation on different pairing symmetries are discussed in details where the electron correlation has been treated within the slave boson formalism. It is shown that for a pure $s$ or pure $d$ wave pairing symmetry, the electro
Externí odkaz:
http://arxiv.org/abs/cond-mat/9801010
The interplay between the band Jahn-Teller distortion and the superconductivity is studied for the system whose Fermi level lies in two-fold degenerate band. Assuming that the lattice distortion is coupled to the orbital electron density and the supe
Externí odkaz:
http://arxiv.org/abs/cond-mat/9610050
The common features in the Raman data of high temperature superconductors: (the cuprates, bismathates, alkali doped fullerides and some organic superconductors), are analyzed. It was shown that qualitative understanding of the data can be achieved in
Externí odkaz:
http://arxiv.org/abs/cond-mat/9602111
We have performed classical molecular dynamics simulation of $Ar_{13}$ cluster to study the behavior of collective excitations. In the solid ``phase'' of the cluster, the collective oscillation of the monopole mode can be well fitted to a damped harm
Externí odkaz:
http://arxiv.org/abs/cond-mat/9601026