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Updated: Jun 5, 2025

Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers
Published on: September 4, 2015
Disorder-induced phase transitions in a two-dimensional magnetic topological insulator system
Yong-Liang Song1, Shu-Xiu Shang1, Xin-Lian Chen1
1School of Physics and Technology, University of Jinan, Jinan, Shandong 250022, People's Republic of China.
Abstract:
We investigate the phase diagram of a two-dimensional magnetic topological system in the parameter space of uncorrelated Anderson disorder and Zeeman splitting energy. In the absence of disorder, the system undergoes the phases of higher-order topological insulators (HOTIs), Chern insulators (CIs) with Chern numbersC = 2 andC = 1, and band insulators successively with enhancing Zeeman energy. The phase boundary separating these phases is found to be strongly deformed by the disorder, which leads to several topological Anderson insulators. Specifically, there exist phase transitions between CI withC = 2 and HOTI, and between CIs withC = 1 andC = 2. For the former one, it is in fact a phase transition between first-order and second-order topological phases. Besides, these disorder induced phase transitions are well explained by self-consistent Born approximation.
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