scholarly journals Electronic states and observed anisotropic band structure of Ca2Co2O5 type layered compound: A comprehensive study

2019 ◽  
Vol 15 ◽  
pp. 102739
Author(s):  
F.P. Zhang ◽  
G.L. Zhang ◽  
G.Q. Qin ◽  
S.J. Qin ◽  
J.X. Zhang
1997 ◽  
Vol 11 (11) ◽  
pp. 477-483 ◽  
Author(s):  
Z. J. Li ◽  
H. B. Xu ◽  
K. L. Yao

Starting from the extensional Su–Schrieffer–Heeger model taking into account the effects of interchain coupling, we have studied the energy spectra and electronic states of soliton excitation in polyacene. The dimerized displacement u0 is found to be similar to the case of trans-polyacetylene, and equals to 0.04 Å. The energy-band gap is 0.38 eV, in agreement with the results derived by other authors. Two new bound electronic states have been found in the conduction band and in the valence band, which is different from the one of trans-polyacetylene. There exists two degenerate soliton states in the center of energy gap. Furthermore, the distribution of charge density and spin density have been discussed in detail.


2001 ◽  
Vol 12 (12) ◽  
pp. 64 ◽  
Author(s):  
Charles W. Thiel ◽  
Herve Cruguel ◽  
Huasheng Wu ◽  
Yongchen Sun ◽  
Gerald J. Lapeyre ◽  
...  

Nanoscale ◽  
2019 ◽  
Vol 11 (38) ◽  
pp. 17894-17903 ◽  
Author(s):  
G. H. Silvestre ◽  
Wanderlã L. Scopel ◽  
R. H. Miwa

(Left) Localization of the electronic states near the Fermi level, and the electronic band structure projected on the S1 and S2 stripes. (Right) Transmission probabilites parallel (y) and perpendicular (x) to the S1/S2 borophene superlattice.


1989 ◽  
Vol 40 (12) ◽  
pp. 8319-8326 ◽  
Author(s):  
R. Cingolani ◽  
L. Tapfer ◽  
Y. H. Zhang ◽  
R. Muralidharan ◽  
K. Ploog ◽  
...  

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
F. Manghi ◽  
M. Puviani ◽  
F. Lenzini

Based on a solution of the Floquet Hamiltonian we have studied the time evolution of electronic states in graphene nanoribbons driven out of equilibrium by time-dependent electromagnetic fields in different regimes of intensity, polarization, and frequency. We show that the time-dependent band structure contains many unconventional features that are not captured by considering the Floquet eigenvalues alone. By analyzing the evolution in time of the state population we have identified regimes for the emergence of time-dependent edge states responsible for charge oscillations across the ribbon.


2003 ◽  
Vol 803 ◽  
Author(s):  
Nazim Mamedov ◽  
Kazuki Wakita ◽  
Seiji Akita ◽  
Yoshikazu Nakayama

ABSTRACTRoom temperature ellipsometric measurements of low dimensional TlMeX2 (Me=Ga, In; X=S,Se,Te) were performed in the photon energy range 1.5–6.5e V.Obtained ellipsometric data were then treated with allowance for optical anisotropy of the above materials. The components of dielectric function tensor were determined. The structures of the obtained dielectric function are interpreted in terms of the angle resolved photoemission and band structure results. The contribution of the atomic states of each atom (Tl, In, Se) in the band states in the point M of the Brillouin zone is traced back using LCAO analysis. An ultraviolet window in the joint density of electronic states of some of TlMeX2 is disclosed and substantiated to be a sign of ferroelectricity at room temperature. For the first time the nanorods of TlMeX2 are demonstrated.


2009 ◽  
Vol 48 (8) ◽  
pp. 3731-3742 ◽  
Author(s):  
Dibyendu Bhattacharya ◽  
Malaichamy Sathiyendiran ◽  
Tzuoo-Tsair Luo ◽  
Che-Hao Chang ◽  
Yu-Hsiang Cheng ◽  
...  

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