Softening of Majorana edge states by long-range couplings

Abstract

The inclusion of long-range couplings in the Kitaev chain is shown to modify the universal scaling of topological states close to the critical point. By means of the scattering approach, we prove that the Majorana states \textit{soften}, becoming increasingly delocalised at a universal rate which is only determined by the interaction range. This edge mechanism can be related to a change in the value of the bulk topological index at criticality, upon careful redefinition of the latter. The critical point turns out to be topologically akin to the trivial phase rather than interpolating between the two phases. Our treatment moreover showcases how various topological aspects of quantum models can be investigated analytically.

7 + 5 pages (main body + appendices), 3 figures

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Cited by in corpus (4)

• Out-of-equilibrium dynamics of quantum many-body systems with long-range interactions
• Strange correlators for topological quantum systems from bulk-boundary correspondence
• Electrical, thermal and thermoelectric transport in open long-range Kitaev chain
• Dynamics of Majorana zero modes across hybrid Kitaev chain