Intrinsic nature of chiral charge order in the kagome superconductor Rb V 3 Sb 5

Superconductors with kagome lattices have been identified for over 40 years, with a superconducting transition temperature ${T}_{c}$ up to 7 K. Recently, certain kagome superconductors have been found to exhibit an exotic charge order, which intertwines with superconductivity and persists to a temperature being one order of magnitude higher than ${T}_{c}$. In this work, we use scanning tunneling microscopy to study the charge order in kagome superconductor $\mathrm{Rb}{\mathrm{V}}_{3}{\mathrm{Sb}}_{5}$. We observe both a $2\ifmmode\times\else\texttimes\fi{}2$ chiral charge order and nematic surface superlattices (predominantly $1\ifmmode\times\else\texttimes\fi{}4$). We find that the $2\ifmmode\times\else\texttimes\fi{}2$ charge order exhibits intrinsic chirality with magnetic field tunability. Defects can scatter electrons to introduce standing waves, which couple with the charge order to cause extrinsic effects. While the chiral charge order resembles that discovered in $\mathrm{K}{\mathrm{V}}_{3}{\mathrm{Sb}}_{5}$, it further interacts with the nematic surface superlattices that are absent in $\mathrm{K}{\mathrm{V}}_{3}{\mathrm{Sb}}_{5}$ but exist in $\mathrm{Cs}{\mathrm{V}}_{3}{\mathrm{Sb}}_{5}$.