Speaker
Description
The candidate type-II Weyl semimetal WTe2 has been shown to host electron-hole band crossings, unusually large magnetoresistance, and nanoscale ferroelectric domains, but there is a lack of experimental evidence establishing the connection between these different phases. While most ferroelectric materials are insulators, WTe2 is a semimetal, and because of this poses a unique opportunity to study the interplay of these phases by nanoscale imaging using scanning tunneling microscopy/spectroscopy (STM/S). Here, we characterize the different domain and impurity types which inhabit the nanoscale landscape of WTe2 to elucidate the correlations between electron and hole pockets of the Fermi surface, magnetism, ferroelectric domains, and the Type-II Weyl points. Mapping of the real space scattering of the Fermi surface electron and hole pockets shows correlations between impurities, ferroelectric domains, DC offsets, strain, and magnetism.