scholarly journals Ultrahigh magnetic field spectroscopy reveals the band structure of the three-dimensional topological insulator Bi2Se3

2017 ◽  
Vol 96 (12) ◽  
Author(s):  
A. Miyata ◽  
Z. Yang ◽  
A. Surrente ◽  
O. Drachenko ◽  
D. K. Maude ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Band Structure ◽  
Topological Insulator ◽  
Three Dimensional ◽  
Field Spectroscopy ◽  
Ultrahigh Magnetic Field

scholarly journals Band structure of a HgTe-based three-dimensional topological insulator

2020 ◽  
Vol 102 (11) ◽  
Author(s):  
J. Gospodarič ◽  
V. Dziom ◽  
A. Shuvaev ◽  
A. A. Dobretsova ◽  
N. N. Mikhailov ◽  
...  
Keyword(s):  
Band Structure ◽  
Topological Insulator ◽  
Three Dimensional

scholarly journals Possible Three-Dimensional Topological Insulator in Pyrochlore Oxides

Symmetry ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1076
Author(s):  
Izumi Hase ◽  
Takashi Yanagisawa
Keyword(s):  
Band Structure ◽  
Topological Insulator ◽  
Nearest Neighbor ◽  
Tight Binding ◽  
Three Dimensional ◽  
Tight Binding Model ◽  
Coupling Constant ◽  
Binding Model ◽  
Effective Spin ◽  
Pyrochlore Oxides

A Kene–Mele-type nearest-neighbor tight-binding model on a pyrochlore lattice is known to be a topological insulator in some parameter region. It is an important task to realize a topological insulator in a real compound, especially in an oxide that is stable in air. In this paper we systematically performed band structure calculations for six pyrochlore oxides A2B2O7 (A = Sn, Pb, Tl; B = Nb, Ta), which are properly described by this model, and found that heavily hole-doped Sn2Nb2O7 is a good candidate. Surprisingly, an effective spin–orbit coupling constant λ changes its sign depending on the composition of the material. Furthermore, we calculated the band structure of three virtual pyrochlore oxides, namely In2Nb2O7, In2Ta2O7 and Sn2Zr2O7. We found that Sn2Zr2O7 has a band gap at the k = 0 (Γ) point, similar to Sn2Nb2O7, though the band structure of Sn2Zr2O7 itself differs from the ideal nearest-neighbor tight-binding model. We propose that the co-doped system (In,Sn)2(Nb,Zr)2O7 may become a candidate of the three-dimensional strong topological insulator.

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