Zero modes of the Kitaev chain with phase-gradients and longer range couplings

We present an analytical solution for the full spectrum of Kitaev's one-dimensional p-wave superconductor with arbitrary hopping, pairing amplitude and chemical potential in the case of an open chain. We also discuss the structure of the zero-modes in the presence of both phase gradients and ne...

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Bibliographic Details
Published in:arXiv.org 2018-04
Main Authors: Mahyaeh, Iman, Ardonne, Eddy
Format: Article
Language:English
Subjects:
Chains
Chemical potential
Couplings
Exact solutions
Organic chemistry
Phase diagrams
Topology
Online Access:Get full text
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Summary:We present an analytical solution for the full spectrum of Kitaev's one-dimensional p-wave superconductor with arbitrary hopping, pairing amplitude and chemical potential in the case of an open chain. We also discuss the structure of the zero-modes in the presence of both phase gradients and next nearest neighbor hopping and pairing terms. As observed by Sticlet et al., one feature of such models is that in a part of the phase diagram, zero-modes are present at one end of the system, while there are none on the other side. We explain the presence of this feature analytically, and show that it requires some fine-tuning of the parameters in the model. Thus as expected, these `one-sided' zero-modes are neither protected by topology, nor by symmetry.
ISSN:2331-8422
DOI:10.48550/arxiv.1709.00959