Tunneling evidence for spatial location of the charge-density-wave induced band splitting in 1T-Ta Se2

Abstract

We present the atomically resolved room temperature scanning-tunneling microscopy study of bias dependent images of charge density waves (CDWs) in 1T-Ta Se2. With the help of angle-resolved photoemission of the CDW-split Ta d z2 band in 1T-Ta Se2, we determine the electronic location of Ta d z2 subbands on inequivalent atoms of the reconstructed Ta plane. We thus demonstrate the atomic origin of the CDW-formation related effects observed in the band structure of this material. © 2007 The American Physical Society.