Time-Reversal Degeneracies in the Band Structure of a Ferromagnetic Metal

1970 ◽  
Vol 1 (3) ◽  
pp. 1261-1263 ◽  
Author(s):  
A. P. Cracknell
Keyword(s):  
Band Structure ◽  
Time Reversal ◽  
Ferromagnetic Metal

scholarly journals Quantum anomalous Hall effect in two-dimensional magnetic insulator heterojunctions

2020 ◽  
Vol 6 (1) ◽  
Author(s):  
Jinbo Pan ◽  
Jiabin Yu ◽  
Yan-Fang Zhang ◽  
Shixuan Du ◽  
Anderson Janotti ◽  
...  
Keyword(s):  
Band Structure ◽  
Time Reversal ◽  
Band Alignment ◽  
Data Driven ◽  
Topological Phases ◽  
Two Dimensional ◽  
Electronic Band ◽  
Type Iii ◽  
Magnetic Insulator ◽  
Broken Gap

Abstract Recent years have witnessed tremendous success in the discovery of topological states of matter. Particularly, sophisticated theoretical methods in time-reversal-invariant topological phases have been developed, leading to the comprehensive search of crystal database and the prediction of thousands of topological materials. In contrast, the discovery of magnetic topological phases that break time reversal is still limited to several exemplary materials because the coexistence of magnetism and topological electronic band structure is rare in a single compound. To overcome this challenge, we propose an alternative approach to realize the quantum anomalous Hall (QAH) effect, a typical example of magnetic topological phase, via engineering two-dimensional (2D) magnetic van der Waals heterojunctions. Instead of a single magnetic topological material, we search for the combinations of two 2D (typically trivial) magnetic insulator compounds with specific band alignment so that they can together form a type-III broken-gap heterojunction with topologically non-trivial band structure. By combining the data-driven materials search, first-principles calculations, and the symmetry-based analytical models, we identify eight type-III broken-gap heterojunctions consisting of 2D ferromagnetic insulators in the MXY compound family as a set of candidates for the QAH effect. In particular, we directly calculate the topological invariant (Chern number) and chiral edge states in the MnNF/MnNCl heterojunction with ferromagnetic stacking. This work illustrates how data-driven material science can be combined with symmetry-based physical principles to guide the search for heterojunction-based quantum materials hosting the QAH effect and other exotic quantum states in general.

scholarly journals Proximity Band Structure and Spin Textures on Both Sides of Topological-Insulator/Ferromagnetic-Metal Interface and Their Charge Transport Probes

Nano Letters ◽  
2017 ◽  
Vol 17 (9) ◽  
pp. 5626-5633 ◽  
Author(s):  
Juan Manuel Marmolejo-Tejada ◽  
Kapildeb Dolui ◽  
Predrag Lazić ◽  
Po-Hao Chang ◽  
Søren Smidstrup ◽  
...  
Keyword(s):  
Band Structure ◽  
Charge Transport ◽  
Topological Insulator ◽  
Ferromagnetic Metal ◽  
Metal Interface

scholarly journals Infrared absorption, multiphonon processes and time reversal effect on Si and Ge band structure

2008 ◽  
Vol 517 (1) ◽  
pp. 134-136
Author(s):  
H.W. Kunert ◽  
A.G.J. Machatine ◽  
J.B. Malherbe ◽  
J. Barnas ◽  
A. Hoffmann ◽  
...  
Keyword(s):  
Band Structure ◽  
Infrared Absorption ◽  
Time Reversal ◽  
Reversal Effect

The electronic band structure of silicon

Physica ◽  
1954 ◽  
Vol 3 (7-12) ◽  
pp. 967-970
Author(s):  
D JENKINS
Keyword(s):  
Band Structure ◽  
Electronic Band Structure ◽  
Electronic Band

Discussion of the band structure effects on thermoemission as deduced from a simple model

1976 ◽  
Vol 37 (2) ◽  
pp. 149-158 ◽  
Author(s):  
A.K. Bhattacharjee ◽  
B. Caroli ◽  
D. Saint-James
Keyword(s):  
Simple Model ◽  
Band Structure
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