• Corpus ID: 235293729

# Optical control of topological memory based on orbital magnetization

@inproceedings{Pershoguba2021OpticalCO,
title={Optical control of topological memory based on orbital magnetization},
author={Sergey S. Pershoguba and Victor M. Yakovenko},
year={2021}
}
• Published 2 June 2021
• Physics
Motivated by twisted graphene multilayers, we study interaction of a Chern insulator with circularly polarized light. We find that the interaction energy contains an antisymmetric term that couples to the helicity of incident light, h = Im[E(ω)×E∗(ω)]. For a two-band Chern insulator, this term is expressed as an integral involving the Berry curvature of the system. Taking advantage of this coupling energy, we propose an experimental protocol for switching topological memory based on orbital…

## References

SHOWING 1-10 OF 75 REFERENCES
Mechanism for Anomalous Hall Ferromagnetism in Twisted Bilayer Graphene.
• Physics, Medicine
Physical review letters
• 2020
A lowest Landau level model is used to understand the origin of the underlying symmetry-broken correlated state in twisted bilayer graphene, which exhibits a phase transition from a spin-valley polarized insulator to a partial or fully valley unpolarized metal as the bandwidth is increased relative to the interaction strength.
Tunable correlated Chern insulator and ferromagnetism in a moiré superlattice
The discovery of a C  = 2 Chern insulator at zero magnetic field should open up opportunities for discovering correlated topological states, possibly with topological excitations, in nearly flat and topologically nontrivial moiré minibands.
Local optical control of ferromagnetism and chemical potential in a topological insulator
• A. L. Yeats, +4 authors D. Awschalom
• Materials Science, Medicine
Proceedings of the National Academy of Sciences
• 2017
Significance Ferromagnetic topological insulators (TIs) have promise for applications in spintronics, metrology, and quantum computing. However, TI materials are fragile and often incompatible with
Emergent ferromagnetism near three-quarters filling in twisted bilayer graphene
Evidence is presented that near three-quarters of the filling of the conduction miniband, these enhanced interactions drive the twisted bilayer graphene into a ferromagnetic state, and measurements suggest that the system may be an incipient Chern insulator.
Quantized chiral edge conduction on domain walls of a magnetic topological insulator
The design and fabricate the magnetic domains in the quantum anomalous Hall state with the tip of a magnetic force microscope and the existence of the chiral one-dimensional edge conduction along the prescribed DWs through transport measurements are proved.
Quantum anomalous Hall effect from intertwined moiré bands.
This study reports the observation of a quantum anomalous Hall effect in AB-stacked MoTe2 /WSe2 moiré heterobilayers and paves the way for discovery of emergent phenomena arising from the combined influence of strong correlation and topology in semiconductor moirÉ materials.
Moiré bands in twisted double-layer graphene
• Physics, Medicine
Proceedings of the National Academy of Sciences
• 2011
This work addresses the electronic structure of a twisted two-layer graphene system, showing that in its continuum Dirac model the moiré pattern periodicity leads to moirÉ Bloch bands.
Twisted bilayer graphene aligned with hexagonal boron nitride: Anomalous Hall effect and a lattice model
• Physics, Materials Science
• 2019
A recent experiment reported a large anomalous Hall effect in Magic Angle Twisted Bilayer Graphene (TBG) aligned with a hexagonal boron nitride(h-BN) substrate at $\frac{3}{4}$ filling of the
Topological Bloch bands in graphene superlattices
• Physics, Medicine
Proceedings of the National Academy of Sciences
• 2015
A designer approach to endow widely available plain materials with topological properties by stacking them atop other nontopological materials is outlined, illustrated with a model system comprising graphene stacked atop hexagonal boron nitride.
Berry Phase Modification to the Energy Spectrum of Excitons.
• Physics, Medicine
Physical review letters
• 2015
By quantizing the semiclassical motion of excitons, it is shown that the Berry curvature can cause an energy splitting between exciton states with opposite angular momentum, and this splitting can be understood as an effective spin-orbit coupling effect.