Spatial density profile of electrons near the LaAlO3/SrTiO3 heterointerface revealed by time-resolved photoluminescence spectroscopy
Creators
- 1. Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011 (Japan)
- 2. Department of Advanced Materials Science, The University of Tokyo, Kashiwa, Chiba 277-8561 (Japan)
- 3. SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, Menlo Park, California 94025 (United States)
- 4. Geballe Laboratory for Advanced Materials, Department of Applied Physics, Stanford University, Stanford, California 94305 (United States)
Description
The depth profile of the electron density near the LaAlO3/SrTiO3 heterointerface has been studied by means of time-resolved photoluminescence (PL) spectroscopy. A broad blue PL band is observed at 2.9 eV, originating from the two-carrier radiative recombination of interface-induced electrons and photoexcited holes. The PL lifetime of LaAlO3/SrTiO3 heterointerface is dominated by the three-carrier Auger recombination of electrons and holes and is sensitive to electron density. We tuned the probing depth by changing the excitation photon energy and evaluated the carrier-density profile using the relation between the carrier density and the PL lifetime. Our non-contact probe method based on PL spectroscopy indicates that the carriers are confined within several nanometers in depth near the LaAlO3/SrTiO3 heterostructures
Additional details
Identifiers
- DOI
- 10.1063/1.4872171;
Publishing Information
- Journal Title
- Applied Physics Letters
- Journal Volume
- 104
- Journal Issue
- 15
- Journal Page Range
- p. 151907-151907.4
- ISSN
- 0003-6951
- CODEN
- APPLAB
INIS
- Country of Publication
- United States
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 45083820
- Subject category
- S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
- Descriptors DEI
- ALUMINATES; CARRIER DENSITY; ELECTRON DENSITY; HOLES; LANTHANUM COMPOUNDS; PHOTOLUMINESCENCE; PHOTONS; RECOMBINATION; STRONTIUM TITANATES
- Descriptors DEC
- ALKALINE EARTH METAL COMPOUNDS; ALUMINIUM COMPOUNDS; BOSONS; ELEMENTARY PARTICLES; EMISSION; LUMINESCENCE; MASSLESS PARTICLES; OXYGEN COMPOUNDS; PHOTON EMISSION; RARE EARTH COMPOUNDS; STRONTIUM COMPOUNDS; TITANATES; TITANIUM COMPOUNDS; TRANSITION ELEMENT COMPOUNDS
Optional Information
- Notes
- (c) 2014 AIP Publishing LLC