Bicircular light tuning of magnetic symmetry and topology in Dirac semimetal Cd3As2

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2022
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Trevisan, Thaís V.
Villar Arribi, Pablo
Heinonen, Olle
Slager, Robert-Jan
Orth, Peter
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American Physical Society
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Orth, Peter
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Physics and Astronomy
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Ames Laboratory
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Physics and AstronomyAmes Laboratory
Abstract
We show that 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 Cd3As2 is a promising platform for BCL Floquet engineering. Without strain, BCL irradiation induces a transition to a noncentrosymmetric 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 ð20Þ and can be controlled by light.
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This article is published as Trevisan, Thaís V., Pablo Villar Arribi, Olle Heinonen, Robert-Jan Slager, and Peter P. Orth. "Bicircular light tuning of magnetic symmetry and topology in Dirac semimetal Cd3As2." Physical Review Letters 128, no. 6 (2022): 066602. DOI: 10.1103/PhysRevLett.128.066602. Copyright 2022 American Physical Society. Posted with permission.
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