Berlin 2024 – scientific programme
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MA: Fachverband Magnetismus
MA 40: Frustrated Magnets II
MA 40.6: Talk
Thursday, March 21, 2024, 16:15–16:30, H 1058
Magnon boundstates versus Ising anyons in Kitaev materials — •Tim Bauer1,2, Lucas R. D. Freitas2,1, Eric C. Andrade3, Reinhold Egger1, and Rodrigo G. Pereira2 — 1Institut für Theoretische Physik, Heinrich-Heine-Universität, Düsseldorf, Germany — 2International Institute of Physics, Universidade Federal do Rio Grande do Norte, Natal, Brazil — 3Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, Brazil
We recently predicted that Majorana zero modes (MZMs) near vortices in the quantum spin liquid (QSL) phase of Kitaev materials can be detected in a scanning tunnelling spectroscopy (STS) experiment in terms of a sequence of conductance steps at voltages below the continuum gap [1]. To ensure that the signals of MZMs can be distinguished from trivial excitations, we consider the same experimental setup in the partially polarized phase and the presence of disorder. The excitations of this phase are topological magnons and known to mimic other experimental signatures of the QSL. We report subgap magnon bound states near magnetic impurities modelled by an antiferromagnetic Kondo coupling and studied within spin-wave theory. The bound state energy vanishes only for a critical coupling that flips the impurity or bulk spin. We thus expect these states to behave differently to MZMs in STS when varying the external magnetic field or tunnelling probe position.
[1] Bauer, Tim, et al. Phys. Rev. B 107.5 (2023): 054432
Keywords: Kitaev; Kondo; Majorana; Magnon; Scanning tunneling spectroscopy