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Zero modes of the Kitaev chain with phase-gradients and longer range couplings
Stockholm University, Faculty of Science, Department of Physics.ORCID iD: 0000-0002-9629-3594
Stockholm University, Faculty of Science, Department of Physics.
Number of Authors: 22018 (English)In: Journal of Physics Communications, ISSN 2399-6528, Vol. 2, no 4, article id UNSP 045010Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2018. Vol. 2, no 4, article id UNSP 045010
Keywords [en]
Kitaev chain, zero Modes, cluster models
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-158175DOI: 10.1088/2399-6528/aab7e5ISI: 000434999300012OAI: oai:DiVA.org:su-158175DiVA, id: diva2:1234172
Available from: 2018-07-23 Created: 2018-07-23 Last updated: 2018-07-23Bibliographically approved

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