scholarly journals Effects of Underground Installation of Seismometers on Three Dimensional Attenuation Structure Inversion

2020 ◽  
Vol 20 (1) ◽  
pp. 1_1-1_12
Author(s):  
Ryoichi NAKAMURA ◽  
Hiroshi TURUOKA ◽  
Aitaro KATO ◽  
Shin'ichi SAKAI ◽  
Naoshi HIRATA
Keyword(s):  
Three Dimensional ◽  
Attenuation Structure ◽  
Structure Inversion

Topological phases of a three-dimensional topological insulator with structure inversion asymmetry

2015 ◽  
Vol 29 (06) ◽  
pp. 1550034 ◽  
Author(s):  
Xiaoyong Guo ◽  
Zaijun Wang ◽  
Qiang Zheng ◽  
Jie Peng
Keyword(s):  
Phase Diagram ◽  
Topological Insulator ◽  
Tight Binding ◽  
Three Dimensional ◽  
Surface States ◽  
Topological Phases ◽  
Zeeman Field ◽  
Surface Modes ◽  
Inversion Asymmetry ◽  
Structure Inversion

We investigate the topological phases of a three-dimensional (3D) topological insulator (TI) without the top–bottom inversion symmetry. We calculate the momentum depended spin Chern number to extract the phase diagram. Various phases are found and we address the dependence of phase boundaries on the strength of inversion asymmetry. Opposite to the quasi-two-dimensional thin film TI, in our 3D system the TI state is stabilized by the structure inversion asymmetry (SIA). With a strong SIA the 3D TI phase can exist even under a large Zeeman field. In a tight-binding form, the surface modes are discussed to confirm with the phase diagram. Particularly we find that the SIA cannot destroy the surface states but open a gap on its spectrum.

scholarly journals Three-dimensional Attenuation Structure beneath the Tokai Region, Central Japan Derived Using Local Earthquake Spectra

2012 ◽  
Vol 65 (2) ◽  
pp. 175-187 ◽  
Author(s):  
Hiroyuki TAKAOKA ◽  
Noriko TSUMURA ◽  
Fukusuke TAKAHASHI ◽  
Kenji NOZAKI ◽  
Aitaro KATO ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Central Japan ◽  
Local Earthquake ◽  
Attenuation Structure ◽  
Tokai Region
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