Vestigial Order from an Excitonic Mother State in Kagome Superconductors $A$V$_3$Sb$_5$

• URL: http://arxiv.org/abs/2503.02929v1
• Date: Tue, 04 Mar 2025 19:00:00 GMT
• Title: Vestigial Order from an Excitonic Mother State in Kagome Superconductors $A$V$_3$Sb$_5$
• Authors: Julian Ingham, Ronny Thomale, Harley D. Scammell,
• Abstract summary: We develop a theory of vestigial order descending from an excitonic mother state in $A$V$_3$Sb$_5$ ($A$=K,Rb,Cs)<n>The application of external fields stabilises a subset of the phase-melted order parameter manifold, producing a symmetry-breaking response which depends on the applied probe.<n>Our proposed excitonic mother state accounts for probe-dependent symmetry breaking patterns without fine-tuning, and predicts additional signatures accessible through optical spectroscopy.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• 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.

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