Electronic Charges and Electric Potential at LaAlO3/SrTiO3 Interfaces Studied by Core-Level Photoemission Spectroscopy
Journal Article
·
· Submitted to Physical Review Letters
OSTI ID:1022453
We studied LaAlO{sub 3}/SrTiO{sub 3} interfaces for varying LaAlO{sub 3} thickness by core-level photoemission spectroscopy. In Ti 2p spectra for conducting 'n-type' interfaces, Ti{sup 3+} signals appeared, which were absent for insulating 'p-type' interfaces. The Ti{sup 3+} signals increased with LaAlO{sub 3} thickness, but started well below the critical thickness of 4 unit cells for metallic transport. Core-level shifts with LaAlO{sub 3} thickness were much smaller than predicted by the polar catastrophe model. We attribute these observations to surface defects/adsorbates providing charges to the interface even below the critical thickness.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76SF00515
- OSTI ID:
- 1022453
- Report Number(s):
- SLAC-PUB-14505; TRN: US201118%%169
- Journal Information:
- Submitted to Physical Review Letters, Journal Name: Submitted to Physical Review Letters
- Country of Publication:
- United States
- Language:
- English
Similar Records
Observation by resonant angle-resolved photoemission of a critical thickness for 2-dimensional electron gas formation in SrTiO{sub 3} embedded in GdTiO{sub 3}
Band Offsets Between Amorphous LaAlO3 And In0.53Ga0.47As
Structural Comparison of n-type and p-type LaAlO3/SrTiO3 Interfaces
Journal Article
·
Mon Dec 07 00:00:00 EST 2015
· Applied Physics Letters
·
OSTI ID:1022453
+15 more
Band Offsets Between Amorphous LaAlO3 And In0.53Ga0.47As
Journal Article
·
Tue Oct 23 00:00:00 EDT 2007
· Appl.Phys.Lett.91:113515,2007
·
OSTI ID:1022453
+11 more
Structural Comparison of n-type and p-type LaAlO3/SrTiO3 Interfaces
Journal Article
·
Fri Aug 19 00:00:00 EDT 2011
· Submitted to Physical Review Letters
·
OSTI ID:1022453