Preparation and electronic properties of potassium doped graphite single crystals

Physica Status Solidi B 245, 2072 (2008)

Preparation and electronic properties of potassium doped graphite single crystals

A. Grüneis, C. Attaccalite, A. Rubio, S.L. Molodtsov, D.V. Vyalikh, J. Fink, R. Follath, T. Pichler

Here we revisited potassium doped graphite using angle– resolved photoemission spectroscopy (ARPES) and perform calculations of the charge transfer from potassium to graphite employing a tight–binding band structure. Our ARPES mea- surements clearly show that the π ∗ band of graphite be- comes occupied upon deposition and intercalation of small amounts of potassium. The observed shift in the Fermi level of ∼ 400 meV is well below the appearance of staged graphite compounds. Thus it is described by a rigid band shift model. The π ∗ band is unoccupied in pristine graphite and can there- fore not be measured by ARPES. Thus potassium doping in the dilute limit provides a key for measuring the π ∗ bands close to the Fermi level by ARPES,

Additional Information

Download
Preprint - 220.67 KB
Doi
http://dx.doi.org/10.1002/pssb.200879662

Related Research Areas