Origin of four-fold angular magnetoresistance symmetry in the CDW state of KV3Sb5

Determine the microscopic mechanism responsible for the nearly four-fold symmetric angular dependence of the magnetoresistivity Rxx(θ) observed in KV3Sb5 within its charge-density-wave ground state under in-plane magnetic fields up to approximately 28 T, including whether this behavior originates from four-fold symmetric carrier scattering on the reconstructed Fermi surface produced by the charge-density-wave order.

Background

The authors measure the angular dependence of the in-plane magnetoresistance Rxx(θ) in KV3Sb5 and find a nearly four-fold symmetric pattern at low fields within the charge-density-wave ground state, persisting up to about 28 T.

This observation is unexpected because standard Lorentz-force considerations typically yield two-fold symmetry in angular magnetoresistance. The authors note that the four-fold symmetric carrier scattering appears intrinsic to the CDW Fermi surface but explicitly state that the underlying reasons remain to be understood.