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Vestigial Order from an Excitonic Mother State in Kagome Superconductors AV₃Sb₅
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Vestigial Order from an Excitonic Mother State in Kagome Superconductors $A$V$_3$Sb$_5$
abstract
Alongside high-temperature charge order and superconductivity, kagome metals exhibit signatures of time-reversal symmetry breaking and nematicity which appear to depend strongly on external perturbations such as strain and magnetic fields, posing a fundamental challenge for conceptual reconciliation. We develop a theory of vestigial order descending from an excitonic mother state in $A$V$_3$Sb$_5$ ($A$=K,Rb,Cs), which develops around $T_* \approx 40$ K. The application of external fields stabilises a subset of the phase-melted order parameter manifold, referred to as a vestigial state, producing a symmetry-breaking response which depends on the applied probe. Our theory reproduces the observations of piezomagnetism, electric magnetic chiral anisotropy, absence of Kerr rotation, unusual elastoresistance response, and superconducting diode effect. Our proposed excitonic mother state accounts for probe-dependent symmetry breaking patterns without fine-tuning, and predicts additional signatures accessible through optical spectroscopy.
Forward citations
Cited by 5 Pith papers
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Distinct lattice and charge excitations in AV3Sb5 kagome superconductors
Polarized Raman spectroscopy reveals ubiquitous E2g phonon degeneracy lifting but distinct polarization dependences in collective CDW excitations across CsV3Sb5, RbV3Sb5, and KV3Sb5.
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Group theory method for extracting order parameters from scanning tunneling microscopy data
A group-theoretic decomposition of STM data shows that certain symmetry-breaking order parameters are 'extinct' in the first Brillouin zone and can only be recovered from higher Brillouin zones or sub-unit-cell information.
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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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Real-Space Imaging of Band Topology via Wavefunction Zeros
Symmetry forces Bloch wavefunctions to vanish at a pattern of real-space points (the 'dark set') that encodes the band's irreducible representation and, through known indicators, its topological index.
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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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