TY - JOUR
T1 - Observation of Magnon Polarons in a Uniaxial Antiferromagnetic Insulator
AU - Li, Junxue
AU - Simensen, Haakon T.
AU - Reitz, Derek
AU - Sun, Qiyang
AU - Yuan, Wei
AU - Li, Chen
AU - Tserkovnyak, Yaroslav
AU - Brataas, Arne
AU - Shi, Jing
N1 - Publisher Copyright:
© 2020 American Physical Society.
PY - 2020/11/17
Y1 - 2020/11/17
N2 - Magnon polarons, a type of hybridized excitations between magnons and phonons, were first reported in yttrium iron garnet as anomalies in the spin Seebeck effect responses. Here, we report an observation of antiferromagnetic (AFM) magnon polarons in a uniaxial AFM insulator Cr2O3. Despite the relatively higher energy of magnon than that of the acoustic phonons, near the spin-flop transition of ∼6 T, the left-handed magnon spectrum shifts downward to hybridize with the acoustic phonons to form AFM magnon polarons, which can also be probed by the spin Seebeck effect. The spin Seebeck signal is founded to be enhanced due to the magnon polarons at low temperatures.
AB - Magnon polarons, a type of hybridized excitations between magnons and phonons, were first reported in yttrium iron garnet as anomalies in the spin Seebeck effect responses. Here, we report an observation of antiferromagnetic (AFM) magnon polarons in a uniaxial AFM insulator Cr2O3. Despite the relatively higher energy of magnon than that of the acoustic phonons, near the spin-flop transition of ∼6 T, the left-handed magnon spectrum shifts downward to hybridize with the acoustic phonons to form AFM magnon polarons, which can also be probed by the spin Seebeck effect. The spin Seebeck signal is founded to be enhanced due to the magnon polarons at low temperatures.
UR - http://www.scopus.com/inward/record.url?scp=85097266464&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.125.217201
DO - 10.1103/PhysRevLett.125.217201
M3 - Article
C2 - 33274995
AN - SCOPUS:85097266464
SN - 0031-9007
VL - 125
JO - Physical Review Letters
JF - Physical Review Letters
IS - 21
M1 - 217201
ER -