Theoretical evidence for unexpected O-rich phases at corners of MgO surfaces

Saswata Bhattacharya, Daniel Berger, Karsten Reuter, Luca M. Ghiringhelli, Sergey V. Levchenko

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


Realistic oxide materials are often semiconductors, in particular at elevated temperatures, and their surfaces contain undercoordinated atoms at structural defects such as steps and corners. Using hybrid density-functional theory and ab initio atomistic thermodynamics, we investigate the interplay of bond-making, bond-breaking, and charge-carrier trapping at the corner defects at the (100) surface of a p-doped MgO in thermodynamic equilibrium with an O2 atmosphere. We show that by manipulating the coordination of surface atoms, one can drastically change and even reverse the order of stability of reduced versus oxidized surface sites.

Original languageEnglish
Article number071601
JournalPhysical Review Materials
Issue number7
Publication statusPublished - 13 Dec 2017
Externally publishedYes


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