scholarly journals Self-induced topological transition in phononic crystals by nonlinearity management

2019 ◽  
Vol 100 (1) ◽  
Author(s):  
Rajesh Chaunsali ◽  
Georgios Theocharis
Keyword(s):  
Phononic Crystals ◽  
Topological Transition ◽  
Nonlinearity Management

scholarly journals Ideal Type-II Weyl Phase and Topological Transition in Phononic Crystals

2020 ◽  
Vol 124 (20) ◽  
Author(s):  
Xueqin Huang ◽  
Weiyin Deng ◽  
Feng Li ◽  
Jiuyang Lu ◽  
Zhengyou Liu
Keyword(s):  
Ideal Type ◽  
Phononic Crystals ◽  
Type Ii ◽  
Topological Transition

Semi-Dirac Points in Phononic Crystals

2014 ◽  
Author(s):  
Xiujuan Zhang ◽  
Ying Wu
Keyword(s):  
Dispersion Relation ◽  
Acoustic Wave ◽  
Wave Velocity ◽  
Dirac Point ◽  
Phononic Crystal ◽  
Effective Medium ◽  
Phononic Crystals ◽  
The Other ◽  
Dirac Cone ◽  
Topological Transition

A semi-Dirac cone refers to a peculiar type of dispersion relation that is linear along the symmetry line but quadratic in the perpendicular direction. It was originally discovered in electron systems, in which the associated quasi-particles are massless along one direction, like those in graphene, but effective-mass-like along the other. It was reported that a semi-Dirac point is associated with the topological phase transition between a semi-metallic phase and a band insulator. Very recently, the classical analogy of a semi-Dirac cone has been reported in an electromagnetic system. Here, we demonstrate that, by accidental degeneracy, two-dimensional phononic crystals consisting of square arrays of elliptical cylinders embedded in water are also able to produce the particular dispersion relation of a semi-Dirac cone in the center of the Brillouin zone. A perturbation method is used to evaluate the linear slope and to affirm that the dispersion relation is a semi-Dirac type. If the scatterers are made of rubber, in which the acoustic wave velocity is lower than that in water, the semi-Dirac dispersion can be characterized by an effective medium theory. The effective medium parameters link the semi-Dirac point to a topological transition in the iso-frequency surface of the phononic crystal, in which an open hyperbola is changed into a closed ellipse. This topological transition results in drastic change in wave manipulation. On the other hand, the theory also reveals that the phononic crystal is a double-zero-index material along the x-direction and photonic-band-edge material along the perpendicular direction (y-direction). If the scatterers are made of steel, in which the acoustic wave velocity is higher than that in water, the effective medium description fails, even though the semi-Dirac dispersion relation looks similar to that in the previous case. Therefore different wave transport behavior is expected. The semi-Dirac points in phononic crystals described in this work would offer new ways to manipulate acoustic waves with simple periodic structures.

Analysis of 1D Phononic Crystals Rod with Uncertainty Parameters

2019 ◽  
Author(s):  
Marcela Machado ◽  
Edson Jansen Pedrosa de Miranda Junior ◽  
Jose Maria Campos dos Santos
Keyword(s):  
Phononic Crystals ◽  
Uncertainty Parameters

Multiband acoustic waveguides constructed by two-dimensional phononic crystals

2020 ◽  
Vol 13 (9) ◽  
pp. 094001
Author(s):  
Wei Zhao ◽  
Yunfei Xu ◽  
Yuting Yang ◽  
Zhi Tao ◽  
Zhi Hong Hang
Keyword(s):  
Phononic Crystals ◽  
Two Dimensional ◽  
Acoustic Waveguides

scholarly journals Progress and perspectives on phononic crystals

2021 ◽  
Vol 129 (16) ◽  
pp. 160901
Author(s):  
Thomas Vasileiadis ◽  
Jeena Varghese ◽  
Visnja Babacic ◽  
Jordi Gomis-Bresco ◽  
Daniel Navarro Urrios ◽  
...  
Keyword(s):  
Phononic Crystals

scholarly journals Phase Signature of Topological Transition in Josephson Junctions

2021 ◽  
Vol 126 (3) ◽  
Author(s):  
Matthieu C. Dartiailh ◽  
William Mayer ◽  
Joseph Yuan ◽  
Kaushini S. Wickramasinghe ◽  
Alex Matos-Abiague ◽  
...  
Keyword(s):  
Josephson Junctions ◽  
Topological Transition

The topological transition from a Corbino to Hall bar geometry

1996 ◽  
Vol 20 (4) ◽  
pp. 651-656 ◽  
Author(s):  
A.S. Sachrajda ◽  
Y. Feng ◽  
R.P. Taylor ◽  
R. Newbury ◽  
P.T. Coleridge ◽  
...  
Keyword(s):  
Topological Transition
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