We report the first direct measurement of hidden Fermi surface nesting in a two dimensional conductor. The system studied was N${\mathrm{a}}_{0.9}$M${\mathrm{o}}_6$${\mathrm{O}}_{17}$, and the measured Fermi surface consists of electron and hole pockets that can be combined to form sets of pseudo-one-dimensional Fermi surfaces, exhibiting the nesting necessary to drive a Peierls transition to a charge density wave state. The observed nesting vector is shown to be in excellent agreement with theory.

• Received 25 January 1996

DOI:https://doi.org/10.1103/PhysRevLett.76.3172