2018/10/31 by Taehun Kim, Kisoo Park, Jonathan C. Leiner +1 · 1 citation
Physics and Astronomy · #Advanced Condensed Matter Physics #Eigenvalues and eigenvectors #Hexagonal lattice #Lattice (music) #Magnet #Magnon #Phonon #Physics of Superconductivity and Magnetism #Quantum #Quasiparticle #Rare-earth and actinide compounds #cond-mat.str-el
paper · pdf · doi:10.7566/jpsj.88.081003
published as Journal of the Physical Society of Japan, 88, 081003 (2019) · 18 pages, 9 figures
openalex created_date 2018/10/05 · arxiv created 2019/03/31 · arxiv updated 2019/04/02 · openalex publication_date 2019/04/05 · openalex updated_date 2026/08/05
Elementary quasiparticles in solids such as phonons and magnons occasionally have nontrivial interactions between them, as well as among themselves. As a result, their energy eigenvalues are renormalized, the quasiparticles spontaneously decay into a multi-particle continuum state, or they are hybridized with each other when their energies are close. As discussed in this review, such anomalous features can appear dominantly in quantum magnets but are not, a priori, negligible for magnetic systems with larger spin values and noncollinear magnetic structures. We review the unconventional magnetic excitations in two-dimensional triangular lattice antiferromagnets and discuss their implications on related issues.