Abstract
A simple metal, having a spherical Fermi surface, should not exhibit cyclotron resonance when the magnetic field is perpendicular to the surface. Nevertheless, a sharp resonance was observed by Grimes in potassium. This phenomenon can be explained by a charge-density-wave (CDW) broken symmetry. A small cylindrical piece of Fermi surface, bounded by the CDW gap and the first minigap, contains electrons having very small velocity. These electrons provide a mechanism for the anomalous resonance even though their relative concentration is only \ensuremath{\sim}4\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}4}$. This same group of electrons is responsible for the sharp photoemission peak (reported by Jensen and Plummer) from (110) surfaces of Na and K.
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