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Title: Two-dimensional electron liquid at the (111) SmTiO{sub 3}/SrTiO{sub 3} interface

Similar to (001) interfaces, a high carrier density, two-dimensional electron liquid (2DEL) is expected to form at (111) RTiO{sub 3}/SrTiO{sub 3} interfaces (R is a trivalent rare earth ion). In this study, epitaxial SmTiO{sub 3} layers were grown on (111) SrTiO{sub 3} surfaces using hybrid molecular beam epitaxy. We report on electrical transport measurements and characterize the carrier densities in the 2DEL and the carrier mobilities at these interfaces. The carrier density is in reasonable agreement with the expected carrier density of ∼2 × 10{sup 14 }cm{sup −2}. Mobility-limiting mechanisms are analyzed and compared with those of (001) interfaces. Collectively, the results indicate that (111) 2DELs are less confined than those at (001) interfaces. These 2DELs should allow for the study of the phenomena induced by the unique topology of the electron system at (111) interfaces.
Authors:
; ;  [1]
  1. Materials Department, University of California, Santa Barbara, California 93106-5050 (United States)
Publication Date:
OSTI Identifier:
22398817
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 13; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CARRIER DENSITY; CARRIER MOBILITY; COMPARATIVE EVALUATIONS; CRYSTAL GROWTH; ELECTRONS; INTERFACES; LAYERS; LIQUIDS; MOLECULAR BEAM EPITAXY; SAMARIUM COMPOUNDS; STRONTIUM TITANATES; SURFACES; TOPOLOGY; TWO-DIMENSIONAL CALCULATIONS; TWO-DIMENSIONAL SYSTEMS