Valleylike Edge States in Chiral Phononic Crystals with Dirac Degeneracies beyond High-Symmetry Points and Boundaries of Brillouin Zones

2020 ◽  
Vol 14 (2) ◽  
Author(s):  
Xiangzhen Han ◽  
Li Li ◽  
Yujin Hu ◽  
Ling Ling ◽  
Zhi-Guo Geng ◽  
...  
Keyword(s):  
Phononic Crystals ◽  
High Symmetry ◽  
Edge States

scholarly journals Topological valley, pseudospin, and pseudospin-valley protected edge states in symmetric pillared phononic crystals

2019 ◽  
Vol 100 (14) ◽  
Author(s):  
Wei Wang ◽  
Bernard Bonello ◽  
Bahram Djafari-Rouhani ◽  
Yan Pennec
Keyword(s):  
Phononic Crystals ◽  
Edge States

scholarly journals Observation of valleylike edge states of sound at a momentum away from the high-symmetry points

2018 ◽  
Vol 97 (15) ◽  
Author(s):  
Bai-Zhan Xia ◽  
Sheng-Jie Zheng ◽  
Ting-Ting Liu ◽  
Jun-Rui Jiao ◽  
Ning Chen ◽  
...  
Keyword(s):  
High Symmetry ◽  
Edge States

scholarly journals Space-time phononic crystals with anomalous topological edge states

2019 ◽  
Vol 1 (3) ◽  
Author(s):  
Mourad Oudich ◽  
Yuanchen Deng ◽  
Molei Tao ◽  
Yun Jing
Keyword(s):  
Space Time ◽  
Phononic Crystals ◽  
Edge States

Thermally tunable topological edge states for in-plane bulk waves in solid phononic crystals

Ultrasonics ◽  
2019 ◽  
Vol 94 ◽  
pp. 227-234 ◽  
Author(s):  
Heng Liu ◽  
Shao-yong Huo ◽  
Lu-yang Feng ◽  
Hong-bo Huang ◽  
Jiu-jiu Chen
Keyword(s):  
Phononic Crystals ◽  
Edge States ◽  
Bulk Waves

scholarly journals Edge states of Floquet–Dirac semimetal in a laser-driven semiconductor quantum-well

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Boyuan Zhang ◽  
Nobuya Maeshima ◽  
Ken-ichi Hino
Keyword(s):  
Boundary Condition ◽  
Quantum Well ◽  
Brillouin Zone ◽  
Stark Effect ◽  
Edge State ◽  
High Symmetry ◽  
Edge States ◽  
Wide Range ◽  
Semiconductor Quantum Well ◽  
Topological States

AbstractBand crossings observed in a wide range of condensed matter systems are recognized as a key to understand low-energy fermionic excitations that behave as massless Dirac particles. Despite rapid progress in this field, the exploration of non-equilibrium topological states remains scarce and it has potential ability of providing a new platform to create unexpected massless Dirac states. Here we show that in a semiconductor quantum-well driven by a cw-laser with linear polarization, the optical Stark effect conducts bulk-band crossing, and the resulting Floquet-Dirac semimetallic phase supports an unconventional edge state in the projected one-dimensional Brillouin zone under a boundary condition that an electron is confined in the direction perpendicular to that of the laser polarization. Further, we reveal that this edge state mediates a transition between topological and non-topological edge states that is caused by tuning the laser intensity. We also show that the properties of the edge states are strikingly changed under a different boundary condition. It is found that such difference originates from that nearly fourfold-degenerate points exist in a certain intermediate region of the bulk Brillouin zone between high-symmetry points.

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