scholarly journals Electric field induced topological phase transition and large enhancements of spin-orbit coupling and Curie temperature in two-dimensional ferromagnetic semiconductors

2021 ◽  
Vol 103 (10) ◽  
Author(s):  
Jing-Yang You ◽  
Xue-Juan Dong ◽  
Bo Gu ◽  
Gang Su
Keyword(s):  
Phase Transition ◽  
Curie Temperature ◽  
Electric Field ◽  
Orbit Coupling ◽  
Ferromagnetic Semiconductors ◽  
Spin Orbit Coupling ◽  
Topological Phase ◽  
Spin Orbit ◽  
Two Dimensional ◽  
Topological Phase Transition

scholarly journals Topological viewpoint of two-dimensional group III-V and IV-IV compounds in the presence of electric field and spin-orbit coupling by density functional theory and tight-binding model

2022 ◽  
Author(s):  
Alireza Baradaran ◽  
Mehdi Ghaffarian
Keyword(s):  
Electric Field ◽  
Density Functional ◽  
Tight Binding ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Binding Model ◽  
Functional Theory ◽  
Group Iii ◽  
Topological Phase Transition

Abstract Using the tight-binding model and density functional theory, the topological invariant of the two-dimensional (2D) group III-V and IV-IV compounds are studied in the absence and the presence of an external perpendicular electric field and spin-orbit coupling. It will be recognized that a critical value of these parameters changes the topological invariant of 2D graphene-like compounds. The significant effects of an external electric field and spin-orbit coupling are considered to the two-center overlap integrals of the Slater-Koster model involved in band structures, changing band-gap, and tuning the topological phase transition between ordinary and quantum spin Hall regime. These declare the good consistency between two theories: tight-binding and density functional. So, this study reveals topological phase transition in these materials. Our finding paves a way to extend an effective Hamiltonian, and may instantly clear some computation aspects of the study in the field of spintronic based on the first-principles methods.

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