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Loop-current order through the kagome looking glass
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Loop-current order through the kagome looking glass
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In loop-current states, interacting electronic degrees of freedom collectively establish interatomic currents, in a rare example of magnetism in which spin degrees of freedom do not play the primary role. The main impact of such states on the electronic spectrum is not via the standard Zeeman term, but via the kinetic energy, in which hopping parameters develop non-trivial phases that break time-reversal symmetry. The recent proposal of loop-current states in kagome superconductors has stimulated renewed interest in this exotic type of magnetism. In this perspective, we use kagome materials as a scaffolding to frame the basic phenomenology of loop-current states. We provide an overview of the group-theoretical properties of loop currents, as well as of relevant microscopic models and ab initio methods. Particular emphasis is given to the comparison with spin-density waves in the presence of spin-orbit coupling, as well as to the anharmonic coupling with charge-density waves, which is present in systems with threefold rotational symmetry. We also provide a brief overview of the current status of loop-current order in kagome metals and discuss open challenges including their experimental detection and interplay with other orders.
Forward citations
Cited by 6 Pith papers
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Discovery of an odd-parity f-wave charge order in a kagome metal
An inversion symmetry-breaking f-wave charge order is discovered in the kagome metal CsV3Sb5, stabilized by gap opening at a Dirac point and serving as an intervening phase before a hidden state below 10 K.
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Single domain spectroscopic signatures of a magnetic Kagome metal
μ-CD-ARPES resolves single magnetic domains in DyMn6Sn6, showing ferrimagnetic Dy-Mn alignment via core-level dichroism and orbital-magnetization signatures in valence bands.
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Nonreciprocal superconducting critical currents with normal state field trainability in kagome superconductor CsV3Sb5
Nonreciprocal zero-field critical currents in CsV3Sb5 nanodevices whose polarity is trainable by magnetic fields applied above the CDW transition, evidencing TRS-breaking loop-current CDW order.
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Orbital altermagnetism on the kagome lattice and possible application to $A$V$_3$Sb$_5$
On an odd-sublattice kagome lattice, non-uniform collinear orbital moments from CDW/loop-current order can form a d-wave altermagnet with spin-split bands, as possibly realized in AV3Sb5.
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Superconductivity in kagome metals due to soft loop-current fluctuations
Soft loop-current fluctuations involving vanadium and antimony orbitals in kagome metals mediate chiral d+id and disorder-robust s± pairing channels, with a pressure-driven Lifshitz transition selecting between them.
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Four-layer charge density waves and chirality in CsV$_3$Sb$_5$
A Ginzburg-Landau stacking analysis of the 2x2x4 CDW in CsV3Sb5 identifies chiral inversion-breaking phases when layer rigidity is relaxed, yet these phases remain rare in the phase diagram.
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