Abstract：
:Topological phase transition is accompanied with a change of topological numbers. According to the bulk-edge correspondence, the gap closing and the breakdown of the adiabaticity are necessary at the phase transition point to make the topological number ill-defined. However, the gap closing is not always needed. In this paper, we show that two topological distinct phases can be continuously connected without gap closing, provided the symmetry of the system changes during the process. Here we propose the generic principles how this is possible by demonstrating various examples such as 1D polyacetylene with the charge-density-wave order, 2D silicene with the antiferromagnetic order, 2D silicene or quantum well made of HgTe with superconducting proximity effects and 3D superconductor Cu doped Bi2Se3. It is argued that such an unusual phenomenon can occur when we detour around the gap closing point provided the connection of the topological numbers is lost along the detour path.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Ezawa M,Tanaka Y,Nagaosa Ndoi
10.1038/srep02790subject
Has Abstractpub_date
2013-09-27 00:00:00pages
2790issn
2045-2322pii
srep02790journal_volume
3pub_type
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