Exceptional point description of one-dimensional chiral topological superconductors/superfluids in BDI class
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...
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| Published in | Physica. E, Low-dimensional systems & nanostructures Vol. 79; pp. 180 - 187 |
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| Main Authors | , |
| Format | Journal Article |
| Language | English |
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Elsevier B.V
01.05.2016
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| Abstract | 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 (Z) winding number invariant characterizing topological superconductor/superfluid phases in the chiral BDI class. |
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| AbstractList | 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 (Z) winding number invariant characterizing topological superconductor/superfluid phases in the chiral BDI class. |
| Author | Mandal, Ipsita Tewari, Sumanta |
| Author_xml | – sequence: 1 givenname: Ipsita surname: Mandal fullname: Mandal, Ipsita email: imandal@pitp.ca organization: Perimeter Institute for Theoretical Physics, 31 Caroline St. N., Waterloo, ON, Canada N2L 2Y5 – sequence: 2 givenname: Sumanta surname: Tewari fullname: Tewari, Sumanta email: stewari@g.clemson.edu organization: Department of Physics and Astronomy, Clemson University, Clemson, SC 29634, USA |
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| Title | Exceptional point description of one-dimensional chiral topological superconductors/superfluids in BDI class |
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