Structural and topological phase transitions induced by strain in two-dimensional bismuth

2019 ◽  
Vol 31 (47) ◽  
pp. 475001 ◽  
Author(s):  
Erika N Lima ◽  
Tome M Schmidt ◽  
R W Nunes
Keyword(s):  
Phase Transitions ◽  
Topological Phase ◽  
Two Dimensional ◽  
Topological Phase Transitions

scholarly journals Prediction of topological crystalline insulators and topological phase transitions in two-dimensional PbTe films

2017 ◽  
Vol 19 (43) ◽  
pp. 29647-29652 ◽  
Author(s):  
Yi-zhen Jia ◽  
Wei-xiao Ji ◽  
Chang-wen Zhang ◽  
Ping Li ◽  
Shu-feng Zhang ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Three Dimensional ◽  
Topological Phases ◽  
Topological Phase ◽  
Two Dimensional ◽  
Topological Crystalline Insulators ◽  
Topological Phase Transitions

Topological phases, especially topological crystalline insulators (TCIs), have been intensively explored and observed experimentally in three-dimensional (3D) materials.

Topological phase transition of two-dimensional topological polaritons

2017 ◽  
Vol 31 (11) ◽  
pp. 1750070
Author(s):  
Zimeng Chi ◽  
Xiaoyong Guo ◽  
Zaijun Wang
Keyword(s):  
Phase Transitions ◽  
Energy Gap ◽  
Tight Binding ◽  
Quantum Spin ◽  
Generic Model ◽  
Topological Phase ◽  
Two Dimensional ◽  
Strongly Coupled ◽  
Bulk Energy ◽  
Topological Phase Transitions

Topological phase transitions of a two-dimensional topologically nontrivial polaritonic system are studied. A generic model of semiconductor excitons strongly coupled with tailored photonic modes is considered. We introduce a pseudospin operator, measuring the polariton polarization between photonic-like and excitonic-like. The associated pseudospin spectrum and pseudospin Chern numbers are calculated. It is shown that the pseudospin Chern number phase diagram exhibits certain features resembling the topological phase of quantum-spin-Hall-like. Moreover, a series of topological phase transitions may occur with the closing of the bulk energy gap or the pseudospin spectrum gap. In a tight-binding form, the edge-mode simulation is done numerically to confirm the analytically results.

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