Work

Phase transitions in quantum dot-Majorana zero mode coupling systems

Year: 2025

Type: article

Abstract: The magnetic doublet ground state (GS) of a quantum dot (QD) could be changed to a spin-singlet GS by coupling to a superconductor. In analogy, here we study the GS phase transitions in QD-Majorana zero mode (MZM) coupling systems: GS behaves phase transition versus intra-dot energy level and QD-MZM coupling strength. The phase diagrams of GS are obtained, for cases with and without Zeeman term. Along with the phase transition, we also study the change of spin feature and density of states. The properties of the phase transition are understood via a mean-field picture. Our study not only serves as an analogue to QD-superconductor phase transitions, but also gives alternative explanations on MZM-relevant experiments.

Source: SciPost Physics Core

DOI: 10.21468/scipostphyscore.8.1.031

Authors: Yue Mao, Qing-Feng Sun

Institution: Peking 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: diamond

Funders: National Natural Science Foundation of China, Peking University, National Key Research and Development Program of China

Awards: G2218941694, G3175490095, G3955724869, G7883239182