Surface electronic structure calculations using the MBJLDA potential: application to Si(111)2 × 1.

Area of Science:

• Surface Science
• Computational Materials Science
• Electronic Structure Theory

Background:

• The Si(111)2 × 1 surface adopts a π-bonded chain configuration.
• Accurate electronic structure determination for this surface typically requires computationally intensive methods like GW or hybrid functionals.

Purpose of the Study:

• To evaluate the efficacy of the modified Becke-Johnson local density approximation (MBJLDA) for calculating the electronic structure of the Si(111)2 × 1 surface.
• To demonstrate MBJLDA as a computationally efficient alternative to existing high-accuracy methods.

Main Methods:

• Application of the MBJLDA approach, originally developed for bulk materials, to surface calculations.
• Comparison of MBJLDA results with those obtained from GW and hybrid functional density functional theory (DFT) methods.

Main Results:

• MBJLDA yields electronic structure results comparable to GW calculations.
• MBJLDA generally outperforms hybrid functional DFT calculations for this system.
• The MBJLDA method offers substantial computational efficiency gains.

Conclusions:

• MBJLDA provides an accurate and computationally efficient method for determining the electronic structure of the Si(111)2 × 1 surface.
• The study justifies and outlines a procedure for applying MBJLDA to surfaces generally.