Signatures of coupling between spin waves and Dirac fermions in YbMnBi 2

Sapkota, Aashish; Classen, L.; Stone, Matthew B.; Savici, Andrei T.; Garlea, Vasile O.; Wang, Aifeng; Tranquada, J. M.; Petrovic, C.; Zaliznyak, I. A.

doi:10.1103/physrevb.101.041111

Signatures of coupling between spin waves and Dirac fermions in ${YbMnBi}_{2}$

Journal Article · Fri Jan 24 00:00:00 EST 2020 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.101.041111· OSTI ID:1593247

^[1]; Classen, L. ^[2]; ^[3]; ^[3]; ^[3]; Wang, Aifeng ^[1]; ^[1]; Petrovic, C. ^[1]; ^[1]

Brookhaven National Lab. (BNL), Upton, NY (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States); Univ. of Minnesota, Minneapolis, MN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Here, we present inelastic neutron scattering measurements of magnetic excitations in YbMnBi₂, which reveal features consistent with a direct coupling of magnetic excitations to Dirac fermions. In contrast with the large broadening of magnetic spectra observed in antiferromagnetic metals such as the iron pnictides, here the spin waves exhibit a small but resolvable intrinsic width, consistent with our theoretical analysis. The subtle manifestation of spin-fermion coupling is a consequence of the Dirac nature of the conduction electrons, including the vanishing density of states near the Dirac points. Accounting for the Dirac fermion dispersion specific to YbMnBi₂ leads to particular signatures, such as the nearly wave-vector-independent damping observed in the experiment.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)

Sponsoring Organization:: Alexander von Humboldt Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC05-00OR22725; SC0012704

OSTI ID:: 1593247

Alternate ID(s):: OSTI ID: 1798568

Report Number(s):: BNL--213565-2020-JAAM

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 4 Vol. 101; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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