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In recent years, research on novel materials and unconventional properties of condensed matter systems has unveiled an ever-growing intertwining between the concepts of topology and chirality. Whether chirality is intrinsically present in a material’s crystal symmetry and interactions, or instead emerges as the result of spontaneously broken symmetries and phase transitions, we often find that non-trivial topological order is accompanied by the emergence of chiral order or chiral quasiparticle states, and vice versa, chiral symmetries and interactions often result in non-trivial topologies of electronic and magnetic ordered states. Examples of this intimate interconnection include the chiral surface states of magnetic topological insulators, the intrinsic chirality of Weyl fermions in topological semimetals, emerging chiral flux phases or charge density wave order in kagome metals, chiral spin or polarization textures in magnetic or multiferroic skyrmionic systems, and the ubiquitous hallmark of the topological Hall effect characterizing these systems.
This Collection brings together the latest advances in our understanding of quantum materials where the intertwining of chirality and topology gives rise to novel and unexpected phenomenology.
We welcome the submission of any paper related to topological chiral quantum materials. All submissions will be subject to the same review process and editorial standards as regular Communications Materials Articles.
Rare-earth-based triangular lattice materials are interesting for their unconventional magnetism. Here, CsNdSe2 single crystals are synthesized, with magnetic susceptibility measurements and first-principles calculations suggesting a candidate spin-liquid ground state.
Kagome superconductors provide a platform to explore intertwined symmetry-breaking orders, but controversies remain despite intensive experimental and theoretical efforts. Here, a combined density functional theory and angle-resolved photoemission spectroscopy study reveals quantum confinement phenomena on the surface of CsV3Sb5, reconciling conflicting observations of time-reversal symmetry breaking between bulk- and surface-sensitive probes.
Materials with a chiral crystal structure are of great interest due to potentially non-trivial structure-property relations. Here, electron microscopy and crystallographic analysis, supported by quantum chemical calculations, shed light on the conversion of the crystal structure of CoSi accompanying a change in handedness.
Kagome metals are remarkably interesting due to the strong interplay of topology, magnetism, van-Hove singularities, correlated flat bands, and structural degrees of freedom. Here, the driving mechanism and dynamics of the charge density wave phase in ScV6Sn6 are investigated by experimental and theoretical techniques, revealing a predominant role of phonons in its stabilization.
As recently proposed, the kagome metal CsV3Sb5 could host spontaneous orbital-currents due to Chern Fermi pockets, but these are challenging to detect. Here, a large g-factor enhancement in magnetic breakdown orbits, determined via quantum oscillations, provides a visible manifestation of Berry-curvature-induced large orbital moments.