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Embedded Majorana islands

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Mesoscopic superconducting islands hosting Majorana zero modes(MZMs),or Majorana islands in short,offer a prototype of topological qubits.In this work we investigate theoretically the model of a generic Majorana island tunneling-coupled to a single-piece metallic substrate,hence an embedded Majorana island.We show the crucial consequences of an interplay between the topological ground states nonlocally addressed by the MZMs and the metallic bath with coherent electron propagation:on the one hand,the topological degeneracy on the Majorana island can be preserved,by virtue of the particle-hole symmetry,despite the apparent bath-induced coupling between MZMs;on the other hand,the electronic interference in the metallic bath may lead to profound alterations to the renormalization group behavior of the hybrid system towards low energy/temperature compared with conventional Kondo physics.This work serves to establish the model of embedded Majorana islands as an experimentally relevant and theoretically intriguing problem particularly in the direction of topological quantum computation.

topological quantum computationMajorana zero modestopological qubitmesoscopic superconductortopological Kondo effect

Jin-Xing Hou、Alex Westström、Rui Wang、Wen-Li Yang、Jian Li

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Institute of Modern Physics,Northwest University,Xi'an 710127,China

Department of Physics,School of Science,Westlake University,Hangzhou 310030,China

Shaanxi Key Laboratory for Theoretical Physics Frontiers,Xi'an 710127,China

Institute of Natural Sciences,Westlake Institute for Advanced Study,Hangzhou 310024,China

National Laboratory of Solid State Microstructures and Department of Physics,Nanjing University,Nanjing 210093,China

Collaborative Innovation Center for Advanced Microstructures,Nanjing 210093,China

Peng Huanwu Center for Fundamental Theory,Xi'an 710127,China

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National Natural Science Foundation of ChinaInnovation Program for Quantum Science and TechnologyNational Natural Science Foundation of ChinaShaanxi Fundamental Science Research Project for Mathematics and PhysicsNational Natural Science Foundation of ChinaNational Natural Science Foundation of China

922652012021ZD03027041224710322JSZ0051232240212274206

2024

10.1007/s11433-024-2418-2

中国科学:物理学 力学 天文学(英文版)
中国科学院

中国科学:物理学 力学 天文学(英文版)

CSTPCD
影响因子：0.91
ISSN：1674-7348
年,卷(期)：2024.67(9)