Giant Intrinsic Spin and Orbital Hall Effects in Sr2MO4 (M=Ru,Rh,Mo)

Abstract

We investigate the intrinsic spin Hall conductivity (SHC) and the d-orbital Hall conductivity (OHC) in metallic d-electron systems, by focusing on the t_{2g}-orbital tight-binding model for Sr2MO4 (M=Ru,Rh,Mo). The conductivities obtained are one or two orders of magnitude larger than predicted values for p-type semiconductors with 5% hole doping. The origin of these giant Hall effects is the ``effective Aharonov-Bohm phase'' that is induced by the d-atomic angular momentum in connection with the spin-orbit interaction and the inter-orbital hopping integrals. The huge SHC and OHC generated by this mechanism are expected to be ubiquitous in multiorbital transition metal complexes, which pens the possibility of realizing spintronics as well as orbitronics devices.

5 pages, accepted for publication in PRL

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• Giant Orbital Hall Effect in Transition Metals: Origin of Large Spin and Anomalous Hall Effects
• Hidden quasi one-dimensional superconductivity in Sr${}_2$RuO${}_4$
• Anomalous Hall Effect in $t_{2g}$ Orbital Kagome Lattice due to Non-collinearity:Significance of Orbital Aharonov-Bohm Effect
• Intrinsic Spin and Orbital Hall Effects in Heavy Fermion Systems
• Giant Extrinsic Spin Hall Effect due to Rare-Earth Impurities
• Intrinsic Spin Hall Effect in s-wave Superconducting State: Analysis of Rashba Model
• Anomalous Hall Effect due to Non-collinearily in Pyrochlore Compounds: Role of Orbital Aharonov-Bohm Effect
• Intrinsic spin Hall effect in graphene: Numerical calculations in a multi-orbital mode
• Anomalous Hall effects and electron polarizability
• Theory of AC Anomalous Hall Conductivity in d-electron systems
• Spin Hall effect in Sr2RuO4 and transition metals (Nb,Ta)