کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5496513 1399853 2017 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Z2 antiferromagnetic topological insulators with broken C4 symmetry
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک و نجوم (عمومی)
پیش نمایش صفحه اول مقاله
Z2 antiferromagnetic topological insulators with broken C4 symmetry
چکیده انگلیسی
A two-dimensional topological insulator may arise in a centrosymmetric commensurate Néel antiferromagnet (AF), where staggered magnetization breaks both the elementary translation and time reversal, but retains their product as a symmetry. Fang et al. [6] proposed an expression for a Z2 topological invariant to characterize such systems. Here, we show that this expression does not allow to detect all the existing phases if a certain lattice symmetry is lacking. We implement numerical techniques to diagnose topological phases of a toy Hamiltonian, and verify our results by computing the Chern numbers of degenerate bands, and also by explicitly constructing the edge states, thus illustrating the efficiency of the method.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters A - Volume 381, Issue 14, 11 April 2017, Pages 1268-1271
نویسندگان
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