Snapshots of Dirac Fermions near the Dirac Point in Topological Insulators

Nano Letters ◽  
2013 ◽  
Vol 13 (12) ◽  
pp. 5797-5802 ◽  
Author(s):  
C. W. Luo ◽  
H. J. Wang ◽  
S. A. Ku ◽  
H.-J. Chen ◽  
T. T. Yeh ◽  
...  
Keyword(s):  
Topological Insulators ◽  
Dirac Point ◽  
Dirac Fermions

scholarly journals Snapshots of Dirac Fermions near the Dirac Point in Topological Insulators

2014 ◽  
Author(s):  
C. W. Luo ◽  
H. J. Wang ◽  
S. A. Ku ◽  
H.-J. Chen ◽  
T. T. Yeh ◽  
...  
Keyword(s):  
Topological Insulators ◽  
Dirac Point ◽  
Dirac Fermions

scholarly journals Discovery of a weak topological insulating state and van Hove singularity in triclinic RhBi2

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Kyungchan Lee ◽  
Gunnar F. Lange ◽  
Lin-Lin Wang ◽  
Brinda Kuthanazhi ◽  
Thaís V. Trevisan ◽  
...  
Keyword(s):  
Time Reversal ◽  
Topological Insulators ◽  
Dirac Point ◽  
Saddle Points ◽  
Surface States ◽  
Van Hove Singularity ◽  
Space Group ◽  
Topological Materials ◽  
Topological Surface ◽  
Optimal Space

AbstractTime reversal symmetric (TRS) invariant topological insulators (TIs) fullfil a paradigmatic role in the field of topological materials, standing at the origin of its development. Apart from TRS protected strong TIs, it was realized early on that more confounding weak topological insulators (WTI) exist. WTIs depend on translational symmetry and exhibit topological surface states only in certain directions making it significantly more difficult to match the experimental success of strong TIs. We here report on the discovery of a WTI state in RhBi2 that belongs to the optimal space group P$$\bar{1}$$ 1 ¯ , which is the only space group where symmetry indicated eigenvalues enumerate all possible invariants due to absence of additional constraining crystalline symmetries. Our ARPES, DFT calculations, and effective model reveal topological surface states with saddle points that are located in the vicinity of a Dirac point resulting in a van Hove singularity (VHS) along the (100) direction close to the Fermi energy (EF). Due to the combination of exotic features, this material offers great potential as a material platform for novel quantum effects.

Simultaneous observation of surface- and edge-states of a 2D topological insulator through scanning tunneling spectroscopy and differential conductance imaging

2017 ◽  
Vol 19 (15) ◽  
pp. 9872-9878 ◽  
Author(s):  
Hrishikesh Bhunia ◽  
Abhijit Bar ◽  
Abhijit Bera ◽  
Amlan J. Pal
Keyword(s):  
Topological Insulator ◽  
Fermi Energy ◽  
Topological Insulators ◽  
Dirac Point ◽  
Scanning Tunneling Spectroscopy ◽  
Tunneling Spectroscopy ◽  
Differential Conductance ◽  
Scanning Tunneling ◽  
Edge States ◽  
Simultaneous Observation

Gapless edge-states with a Dirac point below the Fermi energy and band-edges at the interior observed in 2D topological insulators.

scholarly journals Magnetizing topological surface states of Bi2Se3 with a CrI3 monolayer

2019 ◽  
Vol 5 (5) ◽  
pp. eaaw1874 ◽  
Author(s):  
Yusheng Hou ◽  
Jeongwoo Kim ◽  
Ruqian Wu
Keyword(s):  
Density Functional ◽  
Topological Insulators ◽  
Dirac Point ◽  
Surface States ◽  
Anomalous Hall Effect ◽  
Spin Splitting ◽  
Topological Feature ◽  
Topological Parameters ◽  
General Rules ◽  
Topological Surface

To magnetize surfaces of topological insulators without damaging their topological feature is a crucial step for the realization of the quantum anomalous Hall effect (QAHE) and remains as a challenging task. Through density functional calculations, we found that adsorption of a semiconducting two-dimensional van der Waals (2D-vdW) ferromagnetic CrI3 monolayer can create a sizable spin splitting at the Dirac point of the topological surface states of Bi2Se3 films. Furthermore, general rules that connect different quantum and topological parameters are established through model analyses. This work provides a useful guideline for the realization of QAHE at high temperatures in heterostructures of 2D-vdW magnetic monolayers and topological insulators.

On a new type of massless Dirac fermions in crystalline topological insulators

JETP Letters ◽  
2013 ◽  
Vol 98 (5) ◽  
pp. 298-303 ◽  
Author(s):  
S. N. Molotkov ◽  
T. A. Potapova
Keyword(s):  
Topological Insulators ◽  
Dirac Fermions ◽  
New Type

scholarly journals Spatial fluctuations of helical Dirac fermions on the surface of topological insulators

2011 ◽  
Vol 7 (12) ◽  
pp. 939-943 ◽  
Author(s):  
Haim Beidenkopf ◽  
Pedram Roushan ◽  
Jungpil Seo ◽  
Lindsay Gorman ◽  
Ilya Drozdov ◽  
...  
Keyword(s):  
Topological Insulators ◽  
Dirac Fermions ◽  
Spatial Fluctuations
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