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

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

scholarly journals Near-Bulk Conductivity of Gold Nanowires as Nanoscale Interconnects and the Role of Atomically Smooth Interface

2010 ◽  
Vol 22 (21) ◽  
pp. 2338-2342 ◽  
Author(s):  
Kevin Critchley ◽  
Bishnu P. Khanal ◽  
Marcin Ł. Górzny ◽  
Leonid Vigderman ◽  
Stephen D. Evans ◽  
...  
Keyword(s):  
Gold Nanowires ◽  
Bulk Conductivity ◽  
Smooth Interface

scholarly journals Influence of Quenching and Subsequent Annealing on the Conductivity and Electromechanical Properties of Na1/2Bi1/2TiO3-BaTiO3

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2149
Author(s):  
Lalitha Kodumudi Venkataraman
Keyword(s):  
Quality Factor ◽  
Piezoelectric Properties ◽  
Temperature Limit ◽  
Defect Chemistry ◽  
Mechanical Quality Factor ◽  
Subsequent Annealing ◽  
Minor Role ◽  
Bulk Conductivity ◽  
Mechanical Quality

Na1/2Bi1/2TiO3-based materials have gained considerable attention for their potential to exhibit giant strain, very-high ionic conductivity comparable to yttria stabilized zirconia or high mechanical quality factor for use in high power ultrasonics. In recent times, quenching Na1/2Bi1/2TiO3-based compositions have been demonstrated to enhance the thermal depolarization temperature, thus increasing the operational temperature limit of these materials in application. This work investigates the role of quenching-induced changes in the defect chemistry on the dielectric, ferroelectric and piezoelectric properties of quenched Na1/2Bi1/2TiO3-BaTiO3. The quenched samples indeed demonstrate an increase in the bulk conductivity. Nevertheless, while subsequent annealing of the quenched samples in air/oxygen atmosphere reverts back the depolarization behaviour to that of a furnace cooled specimen, the bulk conductivity remains majorly unaltered. This implies a weak correlation between the defect chemistry and enhanced thermal stability of the piezoelectric properties and hints towards other mechanisms at play. The minor role of oxygen vacancies is further reinforced by the negligible (10–15%) changes in the mechanical quality factor and hysteresis loss.

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.

Role of interlaminar interface on bulk conductivity and electrical anisotropy of CFRP laminates measured by eddy current method

2014 ◽  
Vol 68 ◽  
pp. 1-12 ◽  
Author(s):  
Jun Cheng ◽  
Hongli Ji ◽  
Jinhao Qiu ◽  
Toshiyuki Takagi ◽  
Tetsuya Uchimoto ◽  
...  
Keyword(s):  
Eddy Current ◽  
Current Method ◽  
Electrical Anisotropy ◽  
Bulk Conductivity ◽  
Eddy Current Method ◽  
Cfrp Laminates

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.

Role of dactinomycin in the improved survival of children with Wilms' tumor

JAMA ◽  
1966 ◽  
Vol 195 (12) ◽  
pp. 1005-1009 ◽  
Author(s):  
D. J. Fernbach
Keyword(s):  
Wilms Tumor

Role of the allergist in diagnosis and management of patients with uveitis

JAMA ◽  
1966 ◽  
Vol 195 (3) ◽  
pp. 167-172 ◽  
Author(s):  
T. E. Van Metre
Keyword(s):  
Diagnosis And Management
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