Optically Controlled Orbitronics on a Triangular Lattice

The propagation of electrons in an orbital multiplet dispersing on a lattice can support anomalous transport phenomena deriving from an orbitally induced Berry curvature. In striking contrast to the related situation in graphene, we find that anomalous transport for an L=1 multiplet on the primitive...

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Bibliographic Details
Published in:Physical review letters 2019-12, Vol.123 (23), p.236403-236403, Article 236403
Main Authors: Phong, Võ Tiến, Addison, Zachariah, Ahn, Seongjin, Min, Hongki, Agarwal, Ritesh, Mele, E J
Format: Article
Language:English
Subjects:
Bloch band
Circular polarization
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Graphene
Orbital resonances (celestial mechanics)
Physics
Polarized light
Resistance
Transport phenomena
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Summary:The propagation of electrons in an orbital multiplet dispersing on a lattice can support anomalous transport phenomena deriving from an orbitally induced Berry curvature. In striking contrast to the related situation in graphene, we find that anomalous transport for an L=1 multiplet on the primitive 2D triangular lattice is activated by easily implemented on site and optically tunable potentials. We demonstrate this for dynamics in a Bloch band where point degeneracies carrying opposite winding numbers are generically offset in energy, allowing both an anomalous charge Hall conductance with the sign selected by off-resonance coupling to circularly polarized light and a related anomalous orbital Hall conductance activated by layer buckling.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.123.236403