scholarly journals Coherent ultrafast spin-dynamics probed in three dimensional topological insulators

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
F. Boschini ◽  
M. Mansurova ◽  
G. Mussler ◽  
J. Kampmeier ◽  
D. Grützmacher ◽  
...  
Keyword(s):  
Topological Insulators ◽  
Spin Dynamics ◽  
Three Dimensional

scholarly journals Structure Solution of Nano-Crystalline Small Molecules Using MicroED and Solid-State NMR Dipolar-Based Experiments

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4652
Author(s):  
Nghia Tuan Duong ◽  
Yoshitaka Aoyama ◽  
Katsumi Kawamoto ◽  
Toshio Yamazaki ◽  
Yusuke Nishiyama
Keyword(s):  
Spin Dynamics ◽  
Double Resonance ◽  
Three Dimensional ◽  
Saturation Pulse ◽  
X Ray Crystallography ◽  
Nano Crystalline ◽  
Structure Solution ◽  
Validation Procedure ◽  
R Factors ◽  
Shift Calculation

Three-dimensional electron diffraction crystallography (microED) can solve structures of sub-micrometer crystals, which are too small for single crystal X-ray crystallography. However, R factors for the microED-based structures are generally high because of dynamic scattering. That means R factor may not be reliable provided that kinetic analysis is used. Consequently, there remains ambiguity to locate hydrogens and to assign nuclei with close atomic numbers, like carbon, nitrogen, and oxygen. Herein, we employed microED and ssNMR dipolar-based experiments together with spin dynamics numerical simulations. The NMR dipolar-based experiments were 1H-14N phase-modulated rotational-echo saturation-pulse double-resonance (PM-S-RESPDOR) and 1H-1H selective recoupling of proton (SERP) experiments. The former examined the dephasing effect of a specific 1H resonance under multiple 1H-14N dipolar couplings. The latter examined the selective polarization transfer between a 1H-1H pair. The structure was solved by microED and then validated by evaluating the agreement between experimental and calculated dipolar-based NMR results. As the measurements were performed on 1H and 14N, the method can be employed for natural abundance samples. Furthermore, the whole validation procedure was conducted at 293 K unlike widely used chemical shift calculation at 0 K using the GIPAW method. This combined method was demonstrated on monoclinic l-histidine.

Polarimetric Three-Dimensional Topological Insulators/Organics Thin Film Heterojunction Photodetectors

ACS Nano ◽  
2019 ◽  
Vol 13 (9) ◽  
pp. 10810-10817 ◽  
Author(s):  
Ming Yang ◽  
Jun Wang ◽  
Yafei Zhao ◽  
Liang He ◽  
Chunhui Ji ◽  
...  
Keyword(s):  
Thin Film ◽  
Topological Insulators ◽  
Three Dimensional

scholarly journals Observation of Anderson Localization in Ultrathin Films of Three-Dimensional Topological Insulators

2015 ◽  
Vol 114 (21) ◽  
Author(s):  
Jian Liao ◽  
Yunbo Ou ◽  
Xiao Feng ◽  
Shuo Yang ◽  
Chaojing Lin ◽  
...  
Keyword(s):  
Ultrathin Films ◽  
Anderson Localization ◽  
Topological Insulators ◽  
Three Dimensional
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