Work

Spin-charge-entangled Kondo effect induced by a side-coupled Majorana zero mode

Year: 2025

Type: article

Abstract: We investigate Kondo physics in a quantum dot side coupled to a Majorana zero mode, where the Majorana coupling induces both spin and charge fluctuations that determine low-energy behavior. Using a wave-function-based Schrieffer-Wolff transformation combined with numerical renormalization group calculations, we discover an $S{U}_{L}(2)$ spin-charge-entangled Kondo state, in which conduction electrons screen the spin-charge-entangled degrees of freedom of the Majorana-quantum dot subsystem. We show that the parity degeneracy of this state gives rise to spin-resolved Andreev-normal boundary conditions, resulting in non-Fermi-liquid behavior. Density matrix renormalization group simulations directly resolve a hallmark of these boundary conditions---a subleading even-odd effect in the screening cloud. Our framework bridges strongly correlated and topological phenomena, and naturally extends to ${\mathbb{Z}}_{N}$ parafermions and $SU(N)$ Kondo systems.

Source: Physical review. B./Physical review. B

DOI: 10.1103/kmpz-3ytk

Authors: Haojie Shen, Wei Su, M. N. Chen, Xiaoqun Wang

Institutions: Shanghai Jiao Tong University, Sichuan Normal University, Hangzhou Dianzi University, Zhejiang University

Language: English

Topic: Quantum and electron transport phenomena

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: National Natural Science Foundation of China, China Postdoctoral Science Foundation, Sichuan Normal University

Awards: G1482621474, G1964279764, G4299101600