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Optically Controlled Orbitronics on a Triangular Lattice.

Võ Tiến Phong1, Zachariah Addison1, Seongjin Ahn2

  • 1Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.

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Anomalous electron transport in orbital multiplets on lattices is achievable with tunable potentials. This study demonstrates controllable anomalous charge and orbital Hall conductances using light and layer buckling on a triangular lattice.

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Area of Science:

  • Condensed matter physics
  • Solid-state physics
  • Quantum mechanics

Background:

  • Electrons in lattices can exhibit anomalous transport due to Berry curvature.
  • Graphene systems show related phenomena, but alternative approaches are explored.
  • Orbital degrees of freedom play a crucial role in electron dynamics.

Purpose of the Study:

  • To investigate anomalous transport phenomena in an L=1 orbital multiplet on a 2D triangular lattice.
  • To demonstrate the activation of anomalous transport via tunable potentials.
  • To explore methods for controlling anomalous charge and orbital Hall conductances.

Main Methods:

  • Theoretical modeling of electron propagation on a lattice.
  • Implementation of on-site and optically tunable potentials.
  • Analysis of Bloch band dynamics and point degeneracies.
  • Investigating the effects of circularly polarized light and layer buckling.

Main Results:

  • Anomalous transport is activated in an L=1 multiplet on a triangular lattice.
  • Tunable potentials enable control over electron dynamics.
  • Anomalous charge Hall conductance sign is selected by circularly polarized light.
  • Anomalous orbital Hall conductance is activated by layer buckling.

Conclusions:

  • Tunable potentials offer a practical route to realizing anomalous transport phenomena.
  • Orbital physics provides a versatile platform for designing novel electronic properties.
  • The findings open avenues for optoelectronic and topological material applications.