Bicircular light tuning of magnetic symmetry and topology in Dirac semimetal Cd${}_3$As${}_2$

Abstract

We show that Floquet engineering using bicircular light (BCL) is a versatile way to control magnetic symmetries and topology in materials. The electric field of BCL, which is a superposition of two circularly polarized light waves with frequencies that are integer multiples of each other, traces out a rose pattern in the polarization plane that can be chosen to break selective symmetries, including spatial inversion. Using a realistic low-energy model, we theoretically demonstrate that the three-dimensional Dirac semimetal Cd${}_3$As${}_2$ is a promising platform for BCL Floquet engineering. Without strain, BCL irradiation induces a transition to a non-centrosymmetric magnetic Weyl semimetal phase with tunable energy separation between the Weyl nodes. In the presence of strain, we predict the emergence of a magnetic topological crystalline insulator with exotic unpinned surface Dirac states that are protected by a combination of twofold rotation and time-reversal $(2^{\prime })$ and can be controlled by light.

6 pages, 4 figures (includes Supplemental Material 14 pages, 6 figures)

References in corpus (16)

• Topological Insulators with Inversion Symmetry
• Classification of topological insulators and superconductors in three spatial dimensions
• Topological Field Theory of Time-Reversal Invariant Insulators
• Topological Crystalline Insulators
• Photovoltaic Hall effect in graphene
• Antiferromagnetic topological insulators
• The space group classification of topological band insulators
• Tunable gauge potential for neutral and spinless particles in driven lattices
• Magnetic Topological Quantum Chemistry
• New classes of topological crystalline insulators with unpinned surface Dirac cones
• Tailoring quantum gases by Floquet engineering
• Microscopic theory for the light-induced anomalous Hall effect in graphene
• Topological Euler class as a dynamical observable in optical lattices
• Observation of non-Abelian topological semimetals and their phase transitions
• Topological correspondence between magnetic space group representations
• Topological surface states in strained Dirac semimetal thin films

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• Engineering Floquet topological phases using elliptically polarized light
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