A mesoscopic device for a realization of the topological Kondo effect

Sarkar, Saheli; Tsvelik, Alexei M.

doi:10.1088/1367-2630/ad7a9b

Title: A mesoscopic device for a realization of the topological Kondo effect

Journal Article · 24 September 2024 · New Journal of Physics

DOI: https://doi.org/10.1088/1367-2630/ad7a9b · OSTI ID:2472853

Sarkar, Saheli ^[1]; Tsvelik, Alexei M. ^[1]

Brookhaven National Laboratory (BNL), Upton, NY (United States)

The search for anyons is a field of immense interest owing to its potential application in the field of quantum information. Quantum critical Kondo impurities constitute one possible platform for their realization and topological Kondo effect (TKE) by virtue of remaining critical in the presence of perturbations, seems to be especially promising in this regard. In this paper we discuss practical steps for a realization of TKE with a relatively high Kondo temperature $$\mathbf{T}$$_k. Its central feature is the so-called Majorana-Cooper box (MCB) and we argue that a particular type of iron-based topological superconductor is especially suitable for realization of TKE. Once MCB is available one needs to connect it to external metallic leads to produce TKE. A relatively high value of the Kondo temperature $$\mathbf{T}$$_k is then aided by a large superconducting gap of the iron-based superconductor. We give estimates for $$\mathbf{T}$$_k, for the cases of both isotropic and anisotropic exchange couplings of MCB with the leads.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704

OSTI ID:: 2472853

Report Number(s):: BNL--226258-2024-JAAM

Journal Information:: New Journal of Physics, Journal Name: New Journal of Physics Journal Issue: 9 Vol. 26; ISSN 1367-2630

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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