Does the charge order in CsV_3Sb_5 break time-reversal symmetry? · revision history

Revision 2

Accepted · core change · record

Changes against revision 1:

Title · changed
Revision 1: Does the charge order in CsV3Sb5 break time-reversal symmetry
Revision 2: Does the charge order in $\mathrm{CsV_3Sb_5}$ break time-reversal symmetry?
Plain · changed
Revision 1: Some experiments suggest that the charge order in CsV3Sb5 comes with tiny circulating electric currents (loop currents) that break time-reversal symmetry, while sensitive optical tests see nothing.
Revision 2: Some experiments suggest that the charge order in $\mathrm{CsV_3Sb_5}$ comes with tiny circulating electric currents (loop currents) that break time-reversal symmetry, while sensitive optical tests see nothing.
Precise · changed · core
Revision 1: Determine whether the $2x2$ charge-density-wave state of CsV3Sb5 ($T_{\mathrm{CDW}} = 94\,\mathrm{K}$) breaks time-reversal symmetry, as in loop-current (chiral flux) phases. Reconcile muSR and field-trained transport and optical signals with high-resolution polar Kerr data and spin-polarized STM that found no signal. An answer is a symmetry-resolved measurement on the same crystals with sensitivity sufficient to detect the orbital moments predicted by loop-current theory.
Revision 2: Determine whether the $2x2$ charge-density-wave state of $\mathrm{CsV_3Sb_5}$ ($T_{\mathrm{CDW}} = 94\,\mathrm{K}$) breaks time-reversal symmetry, as in loop-current (chiral flux) phases. Reconcile muSR and field-trained transport and optical signals with high-resolution polar Kerr data and spin-polarized STM that found no signal. An answer is a symmetry-resolved measurement on the same crystals with sensitivity sufficient to detect the orbital moments predicted by loop-current theory.
Settled by
Kerr, muSR and neutron or NMR measurements on the same crystals, with a calibrated sensitivity below the predicted loop-current moment.
Kind
well-posed
Answer type
yes-no
References
(empty)
Literature status
contested
Status note
High-resolution polar Kerr studies (2022, 2025) found no signal, while muSR and some optical and transport data report time-reversal breaking.
Posed since
2021

Decisions