A Chiral Superlattice Route to Spin-Split Topological Antiferromagnetism

Abstract

The interplay between chirality and magnetism is a profound topic, spanning particle physics, condensed matter, chemistry and origin of life. In this paper, we study this interplay in the new antiferromagnet (AFM) UOTe, and we report a chiral superlattice route to spin-split topological phenomena from collinear antiferromagnetism. Pristine UOTe is a collinear AFM without Berry curvature or spin-split bands. However, we identify the spontaneous formation of a chiral superlattice in UOTe, which can be viewed as frozen chiral phonons at finite wave vector. When electrons move through the chiral superlattice, their orbital Bloch wavefunction and quantum geometry are modulated by the strong chiral superlattice potential, generating large Berry curvature in the chiral superlattice, which we detect by the nonlinear Hall effect. At 150 K, the chiral superlattice induced Berry curvature couples to the collinear AFM order, generating a giant anomalous Hall angle ~0.14 abruptly near $T_N$ that is among the largest in bulk magnets. Moreover, our spin Hanle precession measurement shows that the chiral superlattice also generates spin-polarized current from the collinear AFM, a long-standing goal in spintronics. We shed light on the supermodulation formation mechanism based on chemical ion size and physical interlayer-intralayer energy competitions, using which we propose a design principle to discover similar bond-mismatch superlattices, providing a chiral superlattice pathway through real space engineering of quantum geometry.

References in corpus (27)

• Antiferromagnetic spintronics
• Giant anomalous Hall effect in a ferromagnetic Kagome-lattice semimetal
• Quantum nonlinear Hall effect induced by Berry curvature dipole in time-reversal invariant materials
• Massive Dirac fermions in a ferromagnetic kagome metal
• Large anomalous Hall effect driven by non-vanishing Berry curvature in non-collinear antiferromagnetic Mn3Ge
• Anomalous Hall effect arising from noncollinear antiferromagnetism
• Observation of the nonlinear Hall effect under time reversal symmetric conditions
• Observation of the Anomalous Hall Effect in a Collinear Antiferromagnet
• Giant anomalous Nernst effect and quantum-critical scaling in a ferromagnetic semimetal
• Topological quantum properties of chiral crystals
• Concurrence of anomalous Hall effect and charge density wave in a superconducting topological kagome metal
• Spontaneous anomalous Hall effect arising from an unconventional compensated magnetic phase in a semiconductor
• Giant room temperature anomalous Hall effect and magnetically tuned topology in the ferromagnetic Weyl semimetal Co2MnAl
• Room temperature nonlinear Hall effect and wireless RF rectification in Weyl semimetal TaIrTe4
• Large effective magnetic fields from chiral phonons in rare-earth halides
• Clean 2D superconductivity in a bulk van der Waals superlattice
• Constraints on Jones transmission matrices from time-reversal invariance and discrete spatial symmetries
• Bending and Breaking of Stripes in a Charge-Ordered Manganite
• Metallic $p$-wave magnet with commensurate spin helix
• Kerr effect as evidence of gyrotropic order in the cuprates - revisited
• Striped electronic phases in an incommensurately modulated van der Waals superlattice
• Geometrodynamics of electrons in a crystal under position and time dependent deformation
• Relationship of Time Reversal Symmetry Breaking with Optical Kerr Rotation
• Distinct switching of chiral transport in the kagome metals KV${}_3$Sb${}_5$ and CsV${}_3$Sb${}_5$
• UOTe: Kondo-interacting topological antiferromagnet in a van der Waals lattice
• Switchable chiral transport in charge-ordered Kagome metal CsV${}_3$Sb${}_5$
• Dynamical Orbital Angular Momentum Induced by Circularly Polarized Phonons