Show simple item record

dc.contributor.authorHuang, Han
dc.date.accessioned2021-12-20T20:34:28Z
dc.date.available2021-12-20T20:34:28Z
dc.date.issued2021-08
dc.identifier.otherHuang_cornell_0058O_11250
dc.identifier.otherhttp://dissertations.umi.com/cornell:11250
dc.identifier.urihttps://hdl.handle.net/1813/110413
dc.description31 pages
dc.description.abstractWe develop a phonon-magnon interaction model for the two-dimensional (2D) honeycomb ferromagnet and calculate the band structure of the hybrid phonon-magnon excitation. When the phonon (either acoustic or optical) energy overlaps with the magnon energy, the degeneracies at the crossing points are lifted by the phonon-magnon interaction, leading to topological band inversion. We show that the Berry curvatures are nonzero around the phonon-magnon band crossing areas but vanish throughout the rest of the Brillouin zone. We calculate the thermal Hall conductance enabled by the phonon-magnon interaction, which is also an indicator of nontrivial topological properties. Moreover, we show that band topologies can be manipulated by varying spin exchange coupling strengths and Dzyaloshinskii-Moriya interactions (DMI) strengths.
dc.language.isoen
dc.subject2D magnetic material
dc.subjectphonon-magnon
dc.subjecttopological properties
dc.titleTOPOLOGICAL PHONON-MAGNON HYBRID EXCITATIONS IN TWO-DIMENSIONAL HONEYCOMB FERROMAGNET
dc.typedissertation or thesis
thesis.degree.disciplineMaterials Science and Engineering
thesis.degree.grantorCornell University
thesis.degree.levelMaster of Science
thesis.degree.nameM.S., Materials Science and Engineering
dc.contributor.chairTian, Zhiting
dc.contributor.committeeMemberBenedek, Nicole A.
dcterms.licensehttps://hdl.handle.net/1813/59810
dc.identifier.doihttps://doi.org/10.7298/r0p8-td24


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record

Statistics