Journal
APPLIED PHYSICS LETTERS
Volume 95, Issue 8, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3213390
Keywords
carrier density; carrier mobility; Hall effect; lanthanum compounds; strontium compounds
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Funding
- Division of Materials Sciences and Engineering
- U.S. Department of Energy
- Dutch Ministry of Economic Affairs (NanoNed)
- National Science Foundation [DMR04-04781]
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We have found that there is more than one type of conducting carriers generated in LaAlO3/SrTiO3 heterostructures by comparing the sheet carrier density and mobility from optical transmission spectroscopy with those from dc-transport measurements. When multiple types of carriers exist, optical characterization dominantly reflects the contribution from the high-density carriers whereas dc-transport measurements may exaggerate the contribution of the high-mobility carriers even though they are present at low density. Since the low-temperature mobility determined by dc-transport in the LaAlO3/SrTiO3 heterostructures is much higher than that extracted by optical method, we attribute the origin of high-mobility transport to the low-density conducting carriers.
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