New Kind of Surface State in Nearly-Free-Electron Metals

Abstract

We show that for a (2, 0, 0) surface of a bcc crystal there exist not only the Goodwin surface states in the (1, 0, 0) energy gap but also a new kind of surface state in the (½, ½, 0) energy gap. Although the Goodwin state exists only when $V_{200}$ is negative, these new surface states exist for either sign of $V_{110}$.