scholarly journals Nonadiabatic bulk-surface oscillations in driven topological insulators

2016 ◽  
Vol 94 (19) ◽  
Author(s):  
Michael Kolodrubetz ◽  
Benjamin M. Fregoso ◽  
Joel E. Moore
Keyword(s):  
Topological Insulators ◽  
Bulk Surface

scholarly journals Classification of topological invariants related to corner states

2021 ◽  
Vol 111 (5) ◽  
Author(s):  
Shin Hayashi
Keyword(s):  
Periodic Table ◽  
Topological Insulators ◽  
Higher Order ◽  
Topological Invariants ◽  
Bulk Surface ◽  
Definition Of

AbstractWe discuss some bulk-surface gapped Hamiltonians on a lattice with corners and propose a periodic table for topological invariants related to corner states aimed at studies of higher-order topological insulators. Our table is based on four things: (1) the definition of topological invariants, (2) a proof of their relation with corner states, (3) computations of K-groups and (4) a construction of explicit examples.

Materials and Theory of Topological Insulators

2012 ◽  
Author(s):  
Jim Harris ◽  
Shoucheng Zhang
Keyword(s):  
Topological Insulators

Electronic and Vibrational Properties of Single Crystal Surfaces of NiAl

1986 ◽  
Vol 83 ◽  
Author(s):  
S.-C. Lui ◽  
J. M. Mundenar ◽  
E. W. Plummer ◽  
M. E. Mostoller ◽  
R. M. Nicklow ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Nearest Neighbor ◽  
Surface States ◽  
Active Surface ◽  
Atomic Displacement ◽  
Inelastic Electron ◽  
Crystal Surfaces ◽  
Single Crystal Surfaces ◽  
Nial Alloy ◽  
Bulk Surface

ABSTRACTSurface and bulk electronic structure of the ordered NiAl alloy were measured using angle resolved photoelectron spectroscopy. The measured bulk d-bands (Ni like) were observed to be narrower than theoretically calculated d band widths which are 20 to 40% wider (depending upon what is used as a measure of the width). At least two surface states were observed on both the (110) and (111) surfaces. The nature of these surface states and their relationship to the bulk band structure is discussed. Dispersion of bulk phonons was measured by neutron scattering and fitted with a fourth nearest neighbor Born-von Karman model. Dipole active surface phonons on the (110) and (111) surfaces were observed by inelastic electron scattering and the frequencies also calculated assuming a truncated bulk surface. The calculated surface modes present a qualitative picture of the atomic displacement at each surface and also show that the surface phonon energy and intensity depends upon the structure of the surface.

Two-dimensional topological insulators exfoliated from Na3Bi-like Dirac semimetals

2021 ◽  
Author(s):  
Xiaoqiu Guo ◽  
Ruixin Yu ◽  
Jingwen Jiang ◽  
Zhuang Ma ◽  
Xiuwen Zhang
Keyword(s):  
Physical Properties ◽  
Epitaxial Growth ◽  
Topological Insulators ◽  
2D Materials ◽  
Van Der Waals ◽  
Two Dimensional ◽  
Dirac Semimetals

Topological insulation is widely predicted in two-dimensional (2D) materials realized by epitaxial growth or van der Waals (vdW) exfoliation. Such 2D topological insulators (TI’s) host many interesting physical properties such...

scholarly journals Dual-Polarization Second-Order Photonic Topological Insulators

2021 ◽  
Vol 15 (3) ◽  
Author(s):  
Yafeng Chen ◽  
Fei Meng ◽  
Zhihao Lan ◽  
Baohua Jia ◽  
Xiaodong Huang
Keyword(s):  
Topological Insulators ◽  
Second Order ◽  
Dual Polarization
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