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Fermionic Chern insulator from twisted light with linear polarization
Mesoscale and Nanoscale Physics · Submitted 18 Jun 2020
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim With this, our work establishes a new mechanism for generating Fermionic topological phases of matter that can harness the central phase singularity of an optical vortex beam.
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The abstract, sentence by sentence
The breaking of time-reversal symmetry is a crucial ingredient to topological bands. It can occur intrisically in materials with magnetic order, or be induced by external fields, such as magnetic fields in quantum Hall systems, or circularly polarized light fields in Floquet Chern insulators. Apart from polarization, photons can carry another degree of freedom, orbital angular momentum, through which time-reversal symmetry can be broken. In this Letter, we pose the question whether this property allows for inducing topological bands via a linearly polarized but twisted light beam. To this end, we study a graphene-like model of electrons on a honeycomb lattice interacting with a twisted light field. To identify topological behavior of the electrons, we calculate their local markers of Chern number, and monitor the presence of in-gap edge states. Our results are shown to be fully analogous to the behavior found in paradigmatic models for static and driven Chern insulators, and realizing the state is experimentally straightforward. With this, our work establishes a new mechanism for generating Fermionic topological phases of matter that can harness the central phase singularity of an optical vortex beam.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | The breaking of time-reversal symmetry is a crucial ingredient to topological bands. | background 1.00 | 0.04 | 0.02 | asserted 1.00 |
| s1 | It can occur intrisically in materials with magnetic order, or be induced by external fields, such as magnetic fields in quantum Hall systems, or circularly polarized light fields in Floquet Chern insulators. | background 1.00 | 0.03 | 0.02 | asserted 0.95 |
| s2 | Apart from polarization, photons can carry another degree of freedom, orbital angular momentum, through which time-reversal symmetry can be broken. | background 0.99 | 0.05 | 0.03 | asserted 0.79 |
| s3 | In this Letter, we pose the question whether this property allows for inducing topological bands via a linearly polarized but twisted light beam. | contribution 0.59 | 0.21 | 0.04 | hedged possibility 0.37 |
| s4 | To this end, we study a graphene-like model of electrons on a honeycomb lattice interacting with a twisted light field. | method 0.80 | 0.88 | 0.03 | asserted 0.74 |
| s5 | To identify topological behavior of the electrons, we calculate their local markers of Chern number, and monitor the presence of in-gap edge states. | method 1.00 | 0.95 | 0.03 | asserted 0.82 |
| s6 | Our results are shown to be fully analogous to the behavior found in paradigmatic models for static and driven Chern insulators, and realizing the state is experimentally straightforward. | result 0.75 | 0.91 | 0.33 | asserted 1.00 |
| s7 | With this, our work establishes a new mechanism for generating Fermionic topological phases of matter that can harness the central phase singularity of an optical vortex beam. | interpretation 0.56 | 0.86 | 0.90 | asserted 1.00 |
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Original abstract
The breaking of time-reversal symmetry is a crucial ingredient to topological bands. It can occur intrisically in materials with magnetic order, or be induced by external fields, such as magnetic fields in quantum Hall systems, or circularly polarized light fields in Floquet Chern insulators. Apart from polarization, photons can carry another degree of freedom, orbital angular momentum, through which time-reversal symmetry can be broken. In this Letter, we pose the question whether this property allows for inducing topological bands via a linearly polarized but twisted light beam. To this end, we study a graphene-like model of electrons on a honeycomb lattice interacting with a twisted light field. To identify topological behavior of the electrons, we calculate their local markers of Chern number, and monitor the presence of in-gap edge states. Our results are shown to be fully analogous to the behavior found in paradigmatic models for static and driven Chern insulators, and realizing the state is experimentally straightforward. With this, our work establishes a new mechanism for generating Fermionic topological phases of matter that can harness the central phase singularity of an optical vortex beam.
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3 arXiv papers cite this in 4 sentences
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Cites it as background 1 paper
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It has been proposed to use this new degree of freedom for generating a topological band structure by breaking time-reversal symmetry [ref] , for pumping electrons in a magnetic field through the Landau level [ref] , or for producing topological defects such as vortices or skyrmions [ref] .
Two-dimensional excitons from twisted light and the fate of the photon's orbital angular momentum · Introduction · 0.88
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