کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1543873 1512870 2016 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Exceptional point description of one-dimensional chiral topological superconductors/superfluids in BDI class
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
Exceptional point description of one-dimensional chiral topological superconductors/superfluids in BDI class
چکیده انگلیسی

We show that certain singularities of the Hamiltonian in the complex wave vector space can be used to identify topological quantum phase transitions for 1D chiral topological superconductors/superfluids in the BDI class. These singularities fall into the category of the so-called exceptional points (EP's) studied in the context of non-Hermitian Hamiltonians describing open quantum systems. We also propose a generic formula in terms of the properties of the EP  's to quantify the exact number of Majorana zero modes in a particular chiral topological superconducting phase, given the values of the parameters appearing in the Hamiltonian. This formula serves as an alternative to the familiar integer (ZZ) winding number invariant characterizing topological superconductor/superfluid phases in the chiral BDI class.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica E: Low-dimensional Systems and Nanostructures - Volume 79, May 2016, Pages 180–187
نویسندگان
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