Exploring Majorana zero modes in iron-based superconductors

doi:10.1088/1674-1056/ac70c3

Abstract Majorana zero modes (MZMs) are Majorana-fermion-like quasiparticles existing in crystals or hybrid platforms with topologically non-trivial electronic structures. They obey non-Abelian braiding statistics and are considered promising to realize topological quantum computing. Discovery of MZM in the vortices of the iron-based superconductors (IBSs) has recently fueled the Majorana research in a way which not only removes the material barrier requiring construction of complicated hybrid artificial structures, but also enables observation of pure MZMs under higher temperatures. So far, MZMs have been observed in iron-based superconductors including FeTe_0.55Se_0.45, (Li_0.84Fe_0.16)OHFeSe, CaKFe₄As₄, and LiFeAs. In this topical review, we present an overview of the recent STM studies on the MZMs in IBSs. We start with the observation of MZMs in the vortices in FeTe_0.55Se_0.45 and discuss the pros and cons of FeTe_0.55Se_0.45 compared with other platforms. We then review the following up discovery of MZMs in vortices of CaKFe₄As₄, impurity-assisted vortices of LiFeAs, and quantum anomalous vortices in FeTe_0.55Se_0.45, illustrating the pathway of the developments of MZM research in IBSs. Finally, we give perspective on future experimental works in this field.

Keywords: Majorana zero mode iron-based superconductors topological surface states scanning tunneling microscopy

Received: 07 April 2022
Revised: 17 May 2022
Accepted manuscript online: 18 May 2022

PACS:	03.75.Lm	(Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations)
	74.25.-q	(Properties of superconductors)
	74.70.-b	(Superconducting materials other than cuprates)

Fund: The work is supported by the Ministry of Science and Technology of China (Grant No. 2019YFA0308500) and the Chinese Academy of Sciences (Grant Nos. XDB28000000 and YSBR-003).

Corresponding Authors: Hong-Jun Gao
E-mail: hjgao@iphy.ac.cn

Cite this article:

Geng Li(李更), Shiyu Zhu(朱诗雨), Peng Fan(范朋), Lu Cao(曹路), and Hong-Jun Gao(高鸿钧) Exploring Majorana zero modes in iron-based superconductors 2022 Chin. Phys. B 31 080301

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