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Dynamical Majorana Ising spin response in a topological superconductor–magnet hybrid by microwave irradiation

Yuya Ominato1,2, Ai Yamakage3, and Mamoru Matsuo1,4,5,6

  • 1Kavli Institute for Theoretical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
  • 2Waseda Institute for Advanced Study, Waseda University, Shinjuku, Tokyo 169-8050, Japan
  • 3Department of Physics, Nagoya University, Nagoya 464-8602, Japan
  • 4CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100190, China
  • 5Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan
  • 6RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan

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Phys. Rev. B 109, L121405 – Published 18 March, 2024

DOI: https://doi.org/10.1103/PhysRevB.109.L121405

Abstract

We study a dynamical spin response of surface Majorana modes in a topological superconductor–magnet hybrid under microwave irradiation. We find a method to toggle between dissipative and nondissipative Majorana Ising spin dynamics by adjusting the external magnetic field angle and the microwave frequency. This reflects the topological nature of the Majorana modes, enhancing the Gilbert damping of the magnet, thereby providing a detection method for the Majorana Ising spins. Our findings illuminate a magnetic probe for Majorana modes, paving the path to innovative spin devices.

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Phys. Rev. B 109, L121405– Published 18 March, 2024
  • Received 11 August 2023
  • Revised 14 February 2024
  • Accepted 23 February 2024
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