Electronic structure of the c(4 x 2) reconstructed Ge(001) surface

TL;DR

This study uses density functional theory to analyze the electronic structure of the c(4 x 2) reconstructed Ge(001) surface, achieving excellent agreement with experimental scanning tunneling spectroscopy data.

Contribution

It provides a detailed theoretical analysis of the surface electronic states considering surface reconstruction, clarifying experimental interpretations.

Findings

Theoretical surface states match experimental data closely.

Surface reconstruction details are crucial for accurate electronic structure.

Clarifies the nature of occupied and unoccupied states on Ge(001).

Abstract

We investigate the electronic structure of the c(4 x 2) reconstructed Ge(001) surface using band structure calculations based on density functional theory and the generalized gradient approximation. In particular, we take into account the details of surface reconstruction by means of well relaxed crystal structures. The surface electronic states are identified and the local density of states is compared to recent data from scanning tunneling spectroscopy. We obtain almost perfect agreement between theory and experiment for both the occupied and unoccupied states, which allows us to clarify the interpretation of the experimental data.