scholarly journals Phase diagrams of charged colloidal rods: Can a uniaxial charge distribution break chiral symmetry?

2016 ◽  
Vol 144 (9) ◽  
pp. 094901 ◽  
Author(s):  
Tara Drwenski ◽  
Simone Dussi ◽  
Michiel Hermes ◽  
Marjolein Dijkstra ◽  
René van Roij
Keyword(s):  
Phase Diagrams ◽  
Charge Distribution ◽  
Chiral Symmetry ◽  
Break Chiral Symmetry ◽  
Colloidal Rods

scholarly journals Scalar effective potential for D7 brane probes which break chiral symmetry

2006 ◽  
Vol 2006 (05) ◽  
pp. 011-011 ◽  
Author(s):  
Riccardo Apreda ◽  
Johanna Erdmenger ◽  
Nick Evans
Keyword(s):  
Chiral Symmetry ◽  
Effective Potential ◽  
Break Chiral Symmetry

How center vortices break chiral symmetry

2016 ◽  
Author(s):  
Manfried Faber ◽  
Roman Höllwieser
Keyword(s):  
Chiral Symmetry ◽  
Break Chiral Symmetry

scholarly journals Extended SSH Model in Non-Hermitian Waveguides with Alternating Real and Imaginary Couplings

2020 ◽  
Vol 10 (10) ◽  
pp. 3425 ◽  
Author(s):  
Ziwei Fu ◽  
Nianzu Fu ◽  
Huaiyuan Zhang ◽  
Zhe Wang ◽  
Dong Zhao ◽  
...  
Keyword(s):  
Chiral Symmetry ◽  
Zero Mode ◽  
Periodic Structures ◽  
Topological Invariant ◽  
Waveguide Array ◽  
Topological Properties ◽  
Absolute Value ◽  
Optical Routers ◽  
Break Chiral Symmetry ◽  
Ssh Model

We studied the topological properties of an extended Su–Schrieffer–Heeger (SSH) model composed of a binary waveguide array with alternating real and imaginary couplings. The topological invariant of the periodic structures remained quantized with chiral symmetry even though the system was non-Hermitian. The numerical results indicated that phase transition arose when the absolute values of the two couplings were equal. The system supported a topological zero mode at the boundary of nontrivial structures when chiral symmetry was preserved. By adding onsite gain and loss to break chiral symmetry, the topological modes dominated in all supermodes with maximum absolute value of imaginary energy. This study enriches research on the SSH model in non-Hermitian systems and may find applications in optical routers and switches.

Study of charge transfer in FeTi

1983 ◽  
Vol 41 ◽  
pp. 296-297
Author(s):  
J. Taft∅
Keyword(s):  
Charge Transfer ◽  
Charge Distribution ◽  
Electron Scattering ◽  
Periodic System ◽  
Electron Distribution ◽  
Scattering Amplitude ◽  
Transition Elements ◽  
Hartree Fock ◽  
Cscl Structure ◽  
The Right

It is well known that for reflections corresponding to large interplanar spacings (i.e., sin θ/λ small), the electron scattering amplitude, f, is sensitive to the ionicity and to the charge distribution around the atoms. We have used this in order to obtain information about the charge distribution in FeTi, which is a candidate for storage of hydrogen. Our goal is to study the changes in electron distribution in the presence of hydrogen, and also the ionicity of hydrogen in metals, but so far our study has been limited to pure FeTi. FeTi has the CsCl structure and thus Fe and Ti scatter with a phase difference of π into the 100-ref lections. Because Fe (Z = 26) is higher in the periodic system than Ti (Z = 22), an immediate “guess” would be that Fe has a larger scattering amplitude than Ti. However, relativistic Hartree-Fock calculations show that the opposite is the case for the 100-reflection. An explanation for this may be sought in the stronger localization of the d-electrons of the first row transition elements when moving to the right in the periodic table. The tabulated difference between fTi (100) and ffe (100) is small, however, and based on the values of the scattering amplitude for isolated atoms, the kinematical intensity of the 100-reflection is only 5.10-4 of the intensity of the 200-reflection.

Transmission electron microscope studies in special ceramics

1978 ◽  
Vol 36 (1) ◽  
pp. 268-269
Author(s):  
A. Zangvil ◽  
L.J. Gauckler ◽  
G. Schneider ◽  
M. Rühle
Keyword(s):  
Phase Diagrams ◽  
Crystal Structures ◽  
Thin Foil ◽  
Limited Extent ◽  
Complex Materials ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Electron Microscopes ◽  
Lattice Resolution

The use of high temperature special ceramics which are usually complex materials based on oxides, nitrides, carbides and borides of silicon and aluminum, is critically dependent on their thermomechanical and other physical properties. The investigations of the phase diagrams, crystal structures and microstructural features are essential for better understanding of the macro-properties. Phase diagrams and crystal structures have been studied mainly by X-ray diffraction (XRD). Transmission electron microscopy (TEM) has contributed to this field to a very limited extent; it has been used more extensively in the study of microstructure, phase transformations and lattice defects. Often only TEM can give solutions to numerous problems in the above fields, since the various phases exist in extremely fine grains and subgrain structures; single crystals of appreciable size are often not available. Examples with some of our experimental results from two multicomponent systems are presented here. The standard ion thinning technique was used for the preparation of thin foil samples, which were then investigated with JEOL 200A and Siemens ELMISKOP 102 (for the lattice resolution work) electron microscopes.

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