Magneto-optical response in the arbitrary-Chern number topological phase on square lattice

2016 ◽  
Vol 380 (29-30) ◽  
pp. 2312-2316 ◽  
Author(s):  
Yi-Xiang Wang
Keyword(s):  
Optical Response ◽  
Chern Number ◽  
Square Lattice ◽  
Topological Phase

scholarly journals Erratum: Tuning ferromagnetic BaFe2(PO4)2 through a high Chern number topological phase [Phys. Rev. B 94 , 125134 (2016)]

2017 ◽  
Vol 96 (7) ◽  
Author(s):  
Young-Joon Song ◽  
Kyo-Hoon Ahn ◽  
Warren E. Pickett ◽  
Kwan-Woo Lee
Keyword(s):  
Chern Number ◽  
Topological Phase

Quantum anomalous Hall effect on a square lattice with spin–orbit couplings and an exchange field

2014 ◽  
Vol 92 (5) ◽  
pp. 420-424 ◽  
Author(s):  
Xiaoyong Guo ◽  
Xiaobin Ren ◽  
Guangjie Guo ◽  
Jie Peng
Keyword(s):  
Tight Binding ◽  
Chern Number ◽  
Orbit Coupling ◽  
Square Lattice ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Exchange Field ◽  
Edge States ◽  
Binding Model ◽  
Spatial Direction

We investigate a tight-binding model on a two-dimensional square lattice with three terms: the Rashba spin–orbit coupling, the real amplitude next-nearest spin–orbit coupling, and an exchange field. We calculate the first Chern number to identify band topology. It is found that the Chern number takes the quantized values of C1 = 1, 2 and the chiral edge modes can be obtained. Therefore our model realizes the quantum anomalous Hall (QAH) effect. The Rashba coupling is positive for the QAH phase while the next-nearest coupling is detrimental to it. By increasing the exchange field intensity, the Chern number changes from quantized value 2 to 0. The behavior of the edge states is also studied. Particularly for C1 = 2 case, there are two gapless spin-polarized edge states with the same spin polarization moving in the same spatial direction. This indicates that their appearance is topological rather than accidental.

scholarly journals Nonlocal optical response in topological phase transitions in the graphene family

2018 ◽  
Vol 2 (1) ◽  
Author(s):  
Pablo Rodriguez-Lopez ◽  
Wilton J. M. Kort-Kamp ◽  
Diego A. R. Dalvit ◽  
Lilia M. Woods
Keyword(s):  
Phase Transitions ◽  
Optical Response ◽  
Topological Phase ◽  
Topological Phase Transitions

scholarly journals Nontrivial topological phase with a zero Chern number

2020 ◽  
Vol 102 (3) ◽  
Author(s):  
H. C. Wu ◽  
L. Jin ◽  
Z. Song
Keyword(s):  
Chern Number ◽  
Topological Phase
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