scholarly journals Observation of zone folding induced acoustic topological insulators and the role of spin-mixing defects

2017 ◽  
Vol 96 (18) ◽  
Author(s):  
Yuanchen Deng ◽  
Hao Ge ◽  
Yuan Tian ◽  
Minghui Lu ◽  
Yun Jing
Keyword(s):  
Topological Insulators ◽  
Zone Folding

Subwavelength acoustic topological edge states realized by zone folding and the role of boundaries selection

2018 ◽  
Vol 124 (17) ◽  
pp. 175107 ◽  
Author(s):  
Hongqing Dai ◽  
Muyan Qian ◽  
Junrui Jiao ◽  
Baizhan Xia ◽  
Dejie Yu
Keyword(s):  
Edge States ◽  
Zone Folding

Thermal transport in phononic crystals: The role of zone folding effect

2012 ◽  
Vol 111 (7) ◽  
pp. 073508 ◽  
Author(s):  
Edward Dechaumphai ◽  
Renkun Chen
Keyword(s):  
Thermal Transport ◽  
Phononic Crystals ◽  
Zone Folding

Zone folding, morphogenesis of charge densities, and the role of periodicity in GaAs-AlxGa1−xAs (001) superlattices

1986 ◽  
Vol 34 (4) ◽  
pp. 2416-2427 ◽  
Author(s):  
M. A. Gell ◽  
D. Ninno ◽  
M. Jaros ◽  
D. C. Herbert
Keyword(s):  
Charge Densities ◽  
Zone Folding

scholarly journals Nanoscale β-nuclear magnetic resonance depth imaging of topological insulators

2015 ◽  
Vol 112 (28) ◽  
pp. E3645-E3650 ◽  
Author(s):  
Dimitrios Koumoulis ◽  
Gerald D. Morris ◽  
Liang He ◽  
Xufeng Kou ◽  
Danny King ◽  
...  
Keyword(s):  
Topological Insulators ◽  
Magnetic Order ◽  
Depth Profiling ◽  
Surface States ◽  
Bismuth Antimony Telluride ◽  
Depth Imaging ◽  
Topological Materials ◽  
Surfaces And Interfaces ◽  
Topological Phases Of Matter

Considerable evidence suggests that variations in the properties of topological insulators (TIs) at the nanoscale and at interfaces can strongly affect the physics of topological materials. Therefore, a detailed understanding of surface states and interface coupling is crucial to the search for and applications of new topological phases of matter. Currently, no methods can provide depth profiling near surfaces or at interfaces of topologically inequivalent materials. Such a method could advance the study of interactions. Herein, we present a noninvasive depth-profiling technique based on β-detected NMR (β-NMR) spectroscopy of radioactive 8Li+ ions that can provide “one-dimensional imaging” in films of fixed thickness and generates nanoscale views of the electronic wavefunctions and magnetic order at topological surfaces and interfaces. By mapping the 8Li nuclear resonance near the surface and 10-nm deep into the bulk of pure and Cr-doped bismuth antimony telluride films, we provide signatures related to the TI properties and their topological nontrivial characteristics that affect the electron–nuclear hyperfine field, the metallic shift, and magnetic order. These nanoscale variations in β-NMR parameters reflect the unconventional properties of the topological materials under study, and understanding the role of heterogeneities is expected to lead to the discovery of novel phenomena involving quantum materials.

scholarly journals Zone folding induced topological insulators in phononic crystals

2017 ◽  
Vol 142 (4) ◽  
pp. 2576-2576
Author(s):  
Yuanchen Deng ◽  
minghui lu ◽  
Yun Jing
Keyword(s):  
Topological Insulators ◽  
Phononic Crystals ◽  
Zone Folding

scholarly journals Controlling Bulk Conductivity in Topological Insulators: Key Role of Anti-Site Defects

2012 ◽  
Vol 24 (16) ◽  
pp. 2154-2158 ◽  
Author(s):  
D. O. Scanlon ◽  
P. D. C. King ◽  
R. P. Singh ◽  
A. de la Torre ◽  
S. McKeown Walker ◽  
...  
Keyword(s):  
Topological Insulators ◽  
Bulk Conductivity

Two-photon absorption within layered Bi2Te3 topological insulators and the role of nonlinear transmittance therein

2019 ◽  
Vol 7 (23) ◽  
pp. 7027-7034 ◽  
Author(s):  
Junpeng Qiao ◽  
Meng-Yuan Chuang ◽  
Jia-Chi Lan ◽  
Yuan-Yao Lin ◽  
Wei-Heng Sung ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Femtosecond Laser ◽  
Femtosecond Laser Pulse ◽  
Bismuth Telluride ◽  
Topological Insulator ◽  
Topological Insulators ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon

In this study, strong two-photon absorption (TPA) in a layered bismuth telluride (Bi2Te3) topological insulator (TI) is observed and investigated by the Z-scan method under excitation with a femtosecond laser pulse at a wavelength of 1056 nm.

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