Localization of vibrational defects in one-dimensional structures with a complex unit cell

1998 ◽  
Vol 24 (8) ◽  
pp. 583-592 ◽  
Author(s):  
M. A. Mamalui ◽  
E. S. Syrkin ◽  
S. B. Feodosyev
Keyword(s):  
Unit Cell ◽  
One Dimensional ◽  
Complex Unit Cell

Dispersion analysis of a reconfigurable unit cell in a one dimensional periodic architecture

2012 ◽  
Author(s):  
D. N. P Thalakotuna ◽  
L. Matekovits ◽  
Karu P. Esselle ◽  
Stuart Hay ◽  
Michael Heimlich
Keyword(s):  
Dispersion Analysis ◽  
Unit Cell ◽  
One Dimensional

One-dimensional DABCO hydrogen-bonding chain in a hexagonal channel of magnetic [Ni(dmit)2]

2020 ◽  
Vol 49 (46) ◽  
pp. 16772-16777
Author(s):  
Simin Li ◽  
Kiyonori Takahashi ◽  
Ichiro Hisaki ◽  
Kenta Kokado ◽  
Takayoshi Nakamura
Keyword(s):  
Hydrogen Bonding ◽  
Unit Cell ◽  
One Dimensional

(HDABCO+)9(DABCO)[Ni(dmit)2]9·6CH3CN had a hexapetal flower-like pattern of [Ni(dmit)2]−. The [Ni(dmit)2]− hexamers formed trimer units and stacked one-dimensionally including DABCO-CH3CN chain at the centre more than 150 Å long per unit cell.

Slow light in resonant photonic crystals with a complex unit cell

JETP Letters ◽  
2017 ◽  
Vol 105 (1) ◽  
pp. 8-12 ◽  
Author(s):  
D. R. Kazanov ◽  
A. V. Poshakinskiy ◽  
T. V. Shubina
Keyword(s):  
Photonic Crystals ◽  
Slow Light ◽  
Unit Cell ◽  
Complex Unit Cell

Structure and Properties of Ultrathin Ge-Si Superlattices

1986 ◽  
Vol 67 ◽  
Author(s):  
J. Bevk ◽  
J. P. Mannaerts ◽  
L. C. Feldman ◽  
B. A. Davidson ◽  
W. P. Lowe ◽  
...  
Keyword(s):  
Optical Transition ◽  
Growth Direction ◽  
Unit Cell ◽  
Silicon Substrates ◽  
Optical Studies ◽  
One Dimensional ◽  
X Ray ◽  
Ordered Alloys ◽  
Diffraction Patterns ◽  
Highly Strained

ABSTRACTWe report the synthesis, structural characterization, and preliminary optical studies of ultrathin Ge-Si superlattices with individual sublayers smaller than the Si unit cell, grown by MBE on (001) silicon substrates. Structures are fabricated one monolayer at a time in a configuration GeGeSiSiGeGe..., resulting in either ordered alloys or complex cell superlattices. Rutherford backscattering and channeling experiments on these highly strained heterostructures indicate excellent crystallinity with tetragonal distortion as high as 3.5%. Electron diffraction patterns exhibit characteristic superlattice reflections indicative of one-dimensional layering with periodicity of four monolayers. X-ray scans along the growth direction at the (002) position in reciprocal space reveal a strong peak not observed in random GeSi alloys. This scattering is attributed indirectly to the GeSi ordered phase. The optical transition energies measured by Schottky barrier electroreflectance correspond to those expected from homogeneous alloys of the same composition; however, the width of optical transitions is less than 30 meV at room temperature, allowing a clear resolution of the splitting of the valence band by strain. Modification of the unit cell of the diamond lattice in this way should permit the design of materials with novel opto-electronic characteristics. Preliminary Raman and photoconductivity measurements are also reported.

Novel Polyanionic Topologies in Ag2VAsO6 and Ag6V2As2O13

2013 ◽  
Vol 68 (5-6) ◽  
pp. 611-615 ◽  
Author(s):  
Jürgen Nuss ◽  
Jan Curda ◽  
Martin Jansen
Keyword(s):  
Stainless Steel ◽  
Oxygen Pressure ◽  
Unit Cell ◽  
Two Dimensional ◽  
Unit Cell Parameters ◽  
Space Group ◽  
One Dimensional ◽  
Cell Parameters ◽  
High Oxygen Pressure ◽  
Silver Cations

Two new silver vanadate arsenates, Ag2VAsO6 and Ag6V2As2O13, have been prepared applying high oxygen pressure syntheses in stainless-steel autoclaves. Ag2VAsO6 crystallizes in space group P1 with unit cell parameters a=639.1(1), b=646.1(1), c=706.6(1) pm, α =116.105(3), ß =91.759(4), γ = 90:067(4)°, and Z =2 (R1 =0.058, 3935 independent reflections). The structure consists of AsO4 tetrahedra and VO6 octahedra which are linked to form two-dimensional 2¥[VAsO6]2- polyanions, separated by silver cations. Ag6V2As2O13 (C2=c, a=1895.9(2), b=536.40(6), c=1308:5(2) pm, ß =113:578(2)°, Z =4; R1 =0.030, 2571 independent reflections) displays as primary building units AsO4 tetrahedra and VO5 trigonal bipyramids which are condensed by sharing edges to one-dimensional 1¥[V2As2O13]6- ladder-like strands, set apart by the silver cations. These heteropolyanions are without precedent

Electron–phonon interaction in three-, two- and one-dimensional ternary mixed crystals

2016 ◽  
Vol 30 (15) ◽  
pp. 1650182
Author(s):  
Junhua Hou ◽  
Yunpeng Fan
Keyword(s):  
Cell Volume ◽  
Effective Mass ◽  
Unit Cell Volume ◽  
Three Dimensional ◽  
Unit Cell ◽  
Mixed Crystals ◽  
Phonon Interaction ◽  
One Dimensional ◽  
Electron Phonon Interaction ◽  
Self Trapping

The electron–phonon (e–p) interaction in three-dimensional (3D), two-dimensional (2D) and one-dimensional (1D) ternary mixed crystals is studied. The e–p interaction Hamiltonians including the unit cell volume variation in ternary mixed crystals are obtained by using the modified random-element-isodisplacement model and Born–Huang method. The polaronic self-trapping energy and renormalized effective mass of GaAs[Formula: see text]Sb[Formula: see text], GaP[Formula: see text]As[Formula: see text] and GaP[Formula: see text]Sb[Formula: see text] compounds are numerically calculated. It is confirmed theoretically that the nonlinear variation of the self-trapping energy and effective mass with the composition is essential and the unit cell volume effects cannot be neglected except the weak e–p coupling. The dimensional effect cannot also be ignored.

scholarly journals Plasmons in semiconducting superlattices with a complex unit cell

1986 ◽  
Vol 33 (12) ◽  
pp. 8390-8395 ◽  
Author(s):  
Robert A. Mayanovic ◽  
Gabriele F. Giuliani ◽  
John J. Quinn
Keyword(s):  
Unit Cell ◽  
Complex Unit Cell
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