Work

Interplay between Hund’s Coupling and Spin–Orbit Interaction on Elementary Excitations in Sr2IrO4

Year: 2014

Type: article

Abstract: We study the elementary excitations in 5d transition metal oxideSr$_2$IrO$_4$ by calculating the particle-hole Green's function within the random phase approximation on an antiferromagnetic ground state in the two-dimensional multi-orbital Hubbard model. The obtained magnetic excitations of bound states show a characteristic dispersion in consistent with the experiments. In addition, two new types of excitations are found due to the interplay between spin-orbit interaction and Hund's coupling: a magnetic excitation as a bound state, which has energy gap at the $Γ$ point, and an exciton as a resonant mode in the continuum of electron-hole pair creation.

Source: Journal of the Physical Society of Japan

DOI: 10.7566/jpsj.83.053709

Authors: Jun-ichi Igarashi, Tatsuya Nagao

Institutions: Ibaraki University, Gunma University

Language: English

Topic: Advanced Condensed Matter Physics

Subfield: Condensed Matter Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funder: Japan Society for the Promotion of Science

Awards: Magnetic excitations probed by the resonant inelastic x-ray scattering in strongly correlated electron systems, Theory of resonant x-ray scattering in the systems with complex ordering