On the nature of Surface States Stark Effect at clean GaN(0001) surface

Paweł Kempisty, Stanisław Krukowski

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Recently developed model allows for simulations of electric field influence on the surface states. The results of slab simulations show considerable change of the energy of quantum states in the electric field, i.e., Stark Effect associated with the surface (SSSE-Surface States Stark Effect). Detailed studies of the GaN slabs demonstrate spatial variation of the conduction and valence band energy revealing real nature of SSSE phenomenon. It is shown that long range variation of the electric potential is in accordance with the change of the energy of the conduction and valence bands. However, at short distances from GaN(0001) surface, the valence band follows the potential change while the conduction states energy is increased due to quantum overlap repulsion by surface states. It is also shown that at clean GaN(0001) surface Fermi level is pinned at about 0.34eV below the long range projection of the conduction band bottom and varies with the field by about 0.31eV due to electron filling of the surface states.

Original languageEnglish
Article number113704
JournalJournal of Applied Physics
Volume112
Issue number11
DOIs
Publication statusPublished - Dec 1 2012
Externally publishedYes

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Stark effect
conduction bands
valence
slabs
electric fields
Fermi surfaces
energy bands
energy
simulation
projection
conduction
electric potential
electrons

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

On the nature of Surface States Stark Effect at clean GaN(0001) surface. / Kempisty, Paweł; Krukowski, Stanisław.

In: Journal of Applied Physics, Vol. 112, No. 11, 113704, 01.12.2012.

Research output: Contribution to journalArticle

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