This title appears in the Scientific Report :
2009
Please use the identifier:
http://dx.doi.org/10.1103/PhysRevB.80.085316 in citations.
Please use the identifier: http://hdl.handle.net/2128/11027 in citations.
Scanning tunneling microscopy on unpinned GaN(1100) surfaces:Invisibility of valence-band states
Scanning tunneling microscopy on unpinned GaN(1100) surfaces:Invisibility of valence-band states
We investigated the origins of the tunnel current in scanning tunneling microscopy (STM) and spectroscopy experiments on GaN(1100) surfaces. By calculating the tunnel currents in the presence of a tip-induced band bending for unpinned n-type GaN(1100) surfaces, we demonstrate that only conduction-ba...
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Personal Name(s): | Ebert, Ph. |
---|---|
Ivanova, L. / Eisele, H. | |
Contributing Institute: |
Mikrostrukturforschung; IFF-8 |
Published in: | Physical Review B Physical review / B, 80 80 (2009 2009) 8 8, S. 085316 085316 |
Imprint: |
College Park, Md.
APS
2009
|
Physical Description: |
085316 |
DOI: |
10.1103/PhysRevB.80.085316 |
Document Type: |
Journal Article |
Research Program: |
Grundlagen für zukünftige Informationstechnologien |
Series Title: |
Physical Review B
80 |
Subject (ZB): | |
Link: |
Get full text OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/11027 in citations.
We investigated the origins of the tunnel current in scanning tunneling microscopy (STM) and spectroscopy experiments on GaN(1100) surfaces. By calculating the tunnel currents in the presence of a tip-induced band bending for unpinned n-type GaN(1100) surfaces, we demonstrate that only conduction-band states are observed at positive and negative voltage polarities independent of the doping concentration. Valence-band states remain undetectable because tunneling out of the electron-accumulation zone in conduction-band states dominates by four orders of magnitude. As a result band-gap sizes cannot be determined by STM on unpinned GaN(1100) surfaces. Appropriate band-edge positions and gap sizes can be determined on pinned surfaces. |