Kavli Affiliate: Gang Su
| First 5 Authors: Jin-Wei Dong, Jin-Wei Dong, , ,
| Summary:
Altermagnetism (AM), the recently discovered third class of collinear
magnetic order, is characterized by non-relativistic momentum-dependent
spin-split electronic structure with compensated zero net magnetization. It can
arise from the conventional antiferromagnetism by introducing local anisotropy
on the two opposite-spin sublattices, either through structural changes in
local crystallographic symmetry or spontaneous emergence of local staggered
orbital order from electron correlations in multi-orbital systems. Here, we
demonstrate on the two-dimensional square lattice that a $d$-wave AM can emerge
spontaneously in the single-orbital extended Hubbard model, without invoking
the spin-orbital coupling and multi-orbital physics. We carry out mean-field
studies on the concrete single-orbital $t$-$U$-$V$ model with $U$ and $V$ the
onsite and nearest-neighbor Coulomb interactions, obtaining the ground states,
analyzing their properties, and determining the phase diagram in the $U$-$V$
plane. The $d$-wave AM with novel spin-transport behavior is found to be
stabilized in a wide region of the phase diagram when the system is doped away
from half-filling, actualized by the coexistence of onsite antiferromagnetic
order and complex $d$-wave nearest-neighbor spin bond orders. Our findings
provide an alternative route to achieve AM and substantially expand the range
of candidate AM materials.
| Search Query: ArXiv Query: search_query=au:”Gang Su”&id_list=&start=0&max_results=3