We study the thermal transport through a Majorana island connected to multiple external quantum wires. In the presence of a large charging energy, we find that the Wiedemann-Franz law is nontrivially violated at low temperature, contrarily to what happens for the overscreened Kondo effect and for nontopological junctions. For three wires, we find that the Lorenz ratio is rescaled by a universal factor 2/3 and we show that this behavior is due to the presence of localized Majorana modes on the island.

Violation of the Wiedemann-Franz law in the topological Kondo model / Buccheri, Francesco; Nava, Andrea; Egger, Reinhold; Sodano, Pasquale; Giuliano, Domenico. - In: PHYSICAL REVIEW. B. - ISSN 2469-9950. - 105:8(2022). [10.1103/physrevb.105.l081403]

Violation of the Wiedemann-Franz law in the topological Kondo model

Francesco Buccheri;Andrea Nava;
2022

Abstract

We study the thermal transport through a Majorana island connected to multiple external quantum wires. In the presence of a large charging energy, we find that the Wiedemann-Franz law is nontrivially violated at low temperature, contrarily to what happens for the overscreened Kondo effect and for nontopological junctions. For three wires, we find that the Lorenz ratio is rescaled by a universal factor 2/3 and we show that this behavior is due to the presence of localized Majorana modes on the island.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2981580