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  • Letter

Simultaneously improving Rashba-type and Zeeman effects in two-dimensional multiferroics

Xu Li1,2, Hao Tian1,2,3, Hong Jian Zhao4,5, Changsong Xu4,6, Meng Ye7, Lan Chen1,2,*, Hongjun Xiang6, Jun-Ming Liu1, L. Bellaiche4 et al.

Di Wu1,2,† and Yurong Yang1,2,‡

  • 1National Laboratory of Solid State Microstructures and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
  • 2Jiangsu Key Laboratory of Artificial Functional Materials, Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, China
  • 3School of Physics and Electronic Engineering, Zhengzhou Normal University, Zhengzhou 450044, China
  • 4Physics Department and Institute for Nanoscience and Engineering, University of Arkansas, Fayetteville, Arkansas 72701, USA
  • 5International Center of Computational Method and Software, College of Physics, Jilin University, Changchun 130012, China
  • 6Key Laboratory of Computational Physical Sciences (Ministry of Education), State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, China
  • 7State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China

  • *chenlan@nju.edu.cn
  • †diwu@nju.edu.cn
  • ‡yangyr@nju.edu.cn
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Phys. Rev. B 106, L201105 – Published 10 November, 2022

DOI: https://doi.org/10.1103/PhysRevB.106.L201105

Abstract

First-principles calculations are performed to investigate Rashba-type and Zeeman effects in two-dimensional three-atom-layer structures XTe/MnTe/XTe (XMX, X=Sn, Ge). It is found that the Rashba-type and Zeeman effects that typically compete against each other rather cooperatively work together and are improved in XMX, as compared to XTe/XTe/XTe (XXX). This cooperation and improvement are highly required in Majorana qubits for topological quantum computing, Josephson junction of topological superconductivity, and other phenomena. The Rashba-type effect is improved because replacing XTe by MnTe leads to a reduction of the thickness of XMX and increases the interaction between the surface state of the lowest conduction bands and its neighboring states. The improved Zeeman effect in the XMX structure arises from s-d and p-d exchange interactions between Te and Mn ions. The present strategy of simultaneously largely improving Rashba-type and Zeeman effects therefore provides a route to realize stable Majorana fermions, topological superconductivity, and other phenomena that require both large Rashba-type and Zeeman effects.

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Phys. Rev. B 106, L201105– Published 10 November, 2022
  • Received 19 November 2021
  • Revised 18 April 2022
  • Accepted 19 October 2022
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